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CHAPTER 7
MAINTENANCE AIRCREW TASKS
This chapter describes those maneuvers and procedures that are essential for maintaining maintenance aircrew skills. Tasks will be performed for both training and evaluation. If discrepancies are found between this chapter and TM 55-1520-238-MTF, the technical manual takes precedence.
7-1. TASK CONTENTS
a. Task Number and Title. Each task is identified by a number and a title which correspond to the tasks listed in Chapter 5 (Figure 5-3).
b. Conditions. The conditions specify the situation in which the task is to be performed. They describe the important aspects of the performance environment. All conditions must be met before task iterations can be credited.
c. Standards. The standards describe the minimum degree of proficiency or standard of performance to which the task must be accomplished.
d. Description. The description explains how the task should be done to meet the standards. It includes individual and crew-coordinated actions that are to be performed as indicated by the P* (pilot on the controls), P (pilot not on the controls), PC (pilot in command), PLT (pilot), and CPG (copilot-gunner).
e. References. The references listed for each task are sources of information about that particular task.
7-2. INDIVIDUAL AND CREW-COORDINATED ACTIONS
a. Individual Actions. These actions are the portions of a crew task that an individual must accomplish. An example of an individual action is the completion of the engine-start and run-up checks by the PLT and the CPG for their designated seat position.
b. Crew-Coordinated Actions. These portions of a task require the interaction of the entire crew to ensure safe, efficient, and effective task execution.
TASK 2600
TASK: Perform prior-to-maintenance-test-flight checks.
CONDITIONS: In an AH-64 helicopter and given TMs 55-1520-238-10 and 55-1520-238-CL.
STANDARDS:
1. Without error, perform the preflight inspection according to TM 55-1520-238-CL.
2. Correctly enter appropriate information on DA Form 2408-12 (Army Aviator's Flight Record) and DA Form 2408-13 (Aircraft Inspection and Maintenance Record).
3. Correctly determine the maneuvers, checks, and tasks required during the test flight.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The PC will ensure that the preflight inspection is conducted according to TM 55-1520-238-CL. He may direct that the other crew member inspect all or designated sections of the aircraft. The PC will verify that all preflight checks have been completed. He will ensure that the appropriate information is entered on DA Forms 2408-12 and 2408-13.
2. The other crew member will complete the preflight inspection as directed and report to the PC whether the aircraft or assigned sections meet required preflight inspection criteria.
3. The PC will determine the maneuvers or checks necessary for the maintenance test flight. The crew will use additional publications and references as necessary. The PC will brief the other crew member and any supporting ground crew members concerning operation around or on the helicopter and will ensure that the ground communications capability is adequate. He will stress any applicable safety considerations or procedures during the briefing.
4. The PC will ensure that a walk-around inspection is completed prior to flight.
REFERENCES:
Aircraft logbook
AR 95-1
DA Pamphlet 738-751
TM 1-1500-328-23
TM 55-1520-238-10
TM 55-1520-238-23 series
TM 55-1520-238-CL
TM 55-1520-238-MTF
TASK 2602
TASK: Perform interior check: pilot and copilot-gunner station.
CONDITIONS: In an AH-64 helicopter or an AH64CMS and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2604
TASK: Perform before-starting APU checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2606
TASK: Perform starting APU checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS and given
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The PLT will announce initiation of the APU start.
3. The aircrew and the ground crew, if available, will clear the area around the aircraft prior to the APU start and announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2608
TASK: Perform after-starting APU checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with the APU running, and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will continue to clear the area around the aircraft after the APU start and will announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2620
TASK: Perform starting engine checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with after-starting APU checks completed, and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The PLT will announce initiation of the engine starts.
3. The aircrew and the ground crew, if available, will clear the area around the aircraft prior to each engine start.
4. Before starting the engines, the crew will ensure that all appropriate internal and external lights are operational and properly set.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2622
TASK: Perform engine run-up checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with starting engine checks completed, and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will continue to clear the area around the aircraft after the engines are started and will announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2630
TASK: Perform before-taxi checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with engine run-up checks completed, and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will clear the area around the aircraft.
3. The P* will ensure that the parking brake is released and that the tail wheel is unlocked before starting the ground taxi. The P* will announce "Braking" when he intends to release the parking brake. He will announce when the aircraft is clear, his intent to begin ground taxi operations, and the intended direction of turn before turning. The P* will remain focused outside the aircraft and will direct the P to call out the before-taxi checks.
4. The P will announce "Blocking" to acknowledge the P*'s announcement of "Braking." The P will call out the before-taxi check when directed. He will announce when his attention is focused inside the cockpit.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2632
TASK: Perform taxi checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, on a suitable surface, with the before-taxi checks completed and the aircraft cleared.
STANDARDS:
1. Maintain a constant speed appropriate for conditions.
2. Maintain the desired ground track.
3. Without error, perform taxi checks in sequence according to TM 55-1520-238-MTF.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The crew will check brake operation for both crew stations and will note any tendency of the aircraft to swerve because of a brake or wheel malfunction. The crew will check instruments and symbology to verify normal functions. The P* will announce "Braking" when he intends to apply brake pressure. He will remain focused outside the aircraft. The P* will direct the P to call out the taxi checks and assist in clearing the aircraft during the checks.
2. The P will announce "Blocking" to acknowledge the P*'s announcement of "Braking." He will call out the taxi check when directed. He will assist in clearing the aircraft and will provide adequate warning to avoid obstacles. The P will announce when his attention is focused inside the cockpit.
3. The P* will initiate the taxi by increasing the collective slightly (approximately 22 to 24 percent torque) and moving the cyclic slightly forward or aft of neutral to start movement. When the aircraft starts moving, the P* will maintain the collective at not less than 22 to 24 percent torque. He will control the aircraft heading with the pedals. He will use left or right pedal input to turn the aircraft and some lateral cyclic into turns to maintain a level fuselage attitude. To regulate taxi speed, the P* will use a combination of cyclic, collective, and brakes. He should be aware that soft, rough, or sloping terrain may require the use of more than normal power.
NOTE 1: During taxi with the tail wheel unlocked, fuselage roll attitude is controlled with the cyclic. The turn and slip indicator, the standby attitude indicator, the remote attitude indicator, and symbology, as well as outside visual cues, may be used to reference fuselage roll attitude. The accepted method for ground taxi is with the tail wheel in the unlocked position.
NOTE 2: Emergency stops may be performed by applying the wheel brakes, by using aerodynamic braking, or by bringing the aircraft to a hover, depending on ground velocity.
NOTE 3: In BUCS-equipped aircraft, the P should avoid applying excessive pressure when blocking the brakes. Excessive brake pressure may shear a SPAD.
NOTE 4: During rearward taxi, the trailing arm tail wheel may swivel 180 degrees, causing momentary heading instability.
NOTE 5: Excessive cyclic input and insufficient collective application may result in droop-stop pounding.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2634
TASK: Perform baseline and normal engine health indicator test.
CONDITIONS: In an AH-64 helicopter, in an AH64CMS, or orally in a classroom environment.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will position the helicopter into the wind. The crew will perform the procedure as outlined in TM 55-1520-238-MTF.
2. The P will record aircraft hours, pressure altitude, free air temperature, and indicated turbine gas temperature.
NOTE 1: For safety reasons, the CPG should take the controls while the P performs the engine deice check during HIT procedures.
NOTE 2: The PLT should ensure that the ENG INLET advisory light is extinguished prior to taking any turbine gas temperature readings for record.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2636
TASK: Perform before-hover and before-takeoff checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS with the HIT completed.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The P* will direct the P to call out the before-hover and before-takeoff checks.
3. The P will call out the before-hover and before-takeoff checks when directed. He will announce when his attention is focused inside the cockpit.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2640
TASK: Perform hover checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with performance planning information available, at an appropriate hover height.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain a stationary hover at a selected altitude ±2 feet, and determine, without error, that sufficient power is available to complete the mission.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce his intent to bring the aircraft to a stationary hover. He will remain focused outside the aircraft and will announce when the aircraft is stabilized at the desired hover altitude. The P* will verify normal controllability, stability, and center of gravity. He will note vibration levels and stabilator effect on vibration through the full range of stabilator travel. The P* will check instruments and symbology for proper functioning and will minimize movement of the velocity vector and acceleration cue to the extent possible.
2. The P* should use a 5-foot stationary hover when performing this task unless the mission or terrain constraints dictate otherwise. If another hover height is required, he should use that height to compute go/no-go torque and predicted hover torque.
3. The P will observe that pylons articulate properly for the existing configuration. He will monitor the aircraft instruments and symbology for proper functioning and verify the correlation of PPC data. The P will compare the actual performance data to that computed and announce the results to the P*. If the torque required to maintain a stationary hover exceeds the go/no-go torque (OGE) but does not exceed the go/no-go torque (IGE), the P* may attempt only IGE maneuvers. If the torque required tomaintain a stationary hover does not exceed the go/no-go torque (OGE), he may attempt any maneuver requiring OGE/IGE power or less. Anytime the load or environmental conditions increase significantly (1,000 pounds gross weight, 5°C, or 1,000 feet PA), the crew will perform additional hover power checks and, if necessary, recompute all values.
4. The PC will determine whether the aircraft is capable of completing the assigned mission and will ensure that aircraft limitations will not be exceeded.
5. The P will update the doppler and announce when the hover power check is completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2642
TASK: Perform hover maneuvering checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain forward and sideward hover flight at a 5- to 10-foot wheel height, and perform rearward hover flight at a 10- to 15-foot wheel height.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce his intent to perform a forward, lateral, and rearward hovering flight maneuver and will remain focused outside the aircraft. Aircraft speed should not exceed hover symbology saturation. The P* will perform hovering flight by applying cyclic in the desired direction of flight, noting that no excessive inputs are required and that the desired aircraft response and controllability are achieved. He will check symbology for proper functioning and then neutralize the cyclic. The aircraft should drift to a stop. The P* will announce when he terminates each maneuver.
2. The P will assist in clearing the aircraft and will provide adequate warning of obstacles, unusual drift, or altitude changes. He will verify that instruments and symbology are functioning properly. The P will announce when his attention is focused inside the cockpit; for example, when monitoring instruments or symbology.
3. The P* will announce his intent to perform 90-degree left and right pedal turns. He will verify aircraft controllability, aircraft response, and symbology functioning.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2644
TASK: Perform DASE/HAS check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain hover flight at a 5- to 10-foot wheel height during left and right pedal turns.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. With the aircraft at a hover, the P* will note aircraft stability for reference and adjust trim feel as required. He will announce his intent to engage the HAS switch and relax control pressure. The P* will note any change in aircraft attitude from the trimmed condition. Without retrimming, he will perform a smooth left and right 90-degree pedal turn. The P* will relax control pressure and verify that the HAS holds the newly selected heading. He will initiate a climb and ensure that the aircraft maintains the selected heading within ±5 degrees. The P* will return to normal hovering flight and momentarily move the trim release switch to OFF and then to ON. The P* will ensure that the HAS switch disengages and will announce termination of the maneuver.
2. The P will assist in clearing the aircraft and provide adequate warning of obstacles, unusual drift, or altitude changes. He will announce when his attention is focused inside the cockpit.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2646
TASK: Perform visionic systems check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain hover flight at a 5- to 10-foot wheel height.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The CPG will slew the TADS to a target at a distance of 500 meters or more. He will select NFOV in either the DTV or the FLIR and minimize turret drift. The CPG will not attempt to recenter the cross hairs on the target during the remainder of the maneuver.
2. The P* will announce his intent to perform 90-degree left and right pedal turns pivoting about the TADS and will remain focused outside the aircraft. He will announce when he terminates the maneuver.
3. The CPG will assist in clearing the aircraft and will provide adequate warning of obstacles, unusual drift, or altitude changes. He will announce when his attention is focused inside the cockpit.
NOTE: The TADS inertial stabilization system should maintain the selected target within the NFOV at the 90-degree point without operator assistance.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2648
TASK: Perform doppler drift check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain hover flight at a 5- to 10-foot wheel height.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce his intent to perform the doppler drift check. He will select the bob-up mode and remain focused outside the aircraft. The P* will minimize movement of the velocity vector and acceleration cue to the extent possible. He will hover the aircraft for one minute and will note the amount of doppler drift from the original position. The P* will announce when he terminates the maneuver.
2. The P will assist in clearing the aircraft and will provide adequate warning of obstacles, unusual drift, or altitude changes. He will announce when his attention is focused inside the cockpit; for example, when monitoring the TADS HOD/HDD.
NOTE: Rates as high as 21 feet per minute may occur with a properly functioning doppler system.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2650
TASK: Perform initial takeoff check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS with the hover power and before-takeoff checks completed and the aircraft cleared.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Initiate the takeoff from an appropriate hover altitude ±2 feet.
5. Maintain takeoff heading ±10 degrees.
6. Maintain ground track alignment with the takeoff direc-tion with minimum drift.
7. Maintain the aircraft in trim above 50 feet AGL.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will remain focused outside the aircraft during the maneuver. He will announce when the HAS is engaged and select the PNVS fixed forward position. The P* will announce when he initiates the takeoff and his intent to abort or alter the takeoff. He will confirm normal HAS disengagement, flight control positioning and aircraft response, and PNVS sensor operation.
2. The P will select the TADS fixed forward position and will announce when ready for takeoff. He will remain focused outside the aircraft to assist in clearing and to provide adequate warning of obstacles. The P will confirm normal sensor operation and stabilator scheduling. He will announce when his attention is focused inside the cockpit; for example, when monitoring the stabilator automatic programming system.
3. The crew will verify that instruments and symbology are functioning properly. They also will note vibration levels and entry airspeed at which encountered. The crew will ensure that engine torque matching is within 10 percent.
4. From a hover, the P* will select reference points to maintain ground track. He will apply forward cyclic to accelerate the aircraft while applying approximately 10 percent torque above hover power with the collective to accelerate through ETL. The P* will maintain ground track and keep the aircraft aligned with the takeoff direction below 50 feet AGL. When above minimum single-engine airspeed, he will position the collective to establish the desired rate of climb.
NOTE 1: The P* must avoid nose-low accelerative attitudes in excess of 10 degrees.
NOTE 2: The height velocity diagram in TM 55-1520-238-10, Chapter 5, displays "avoid areas." This diagram assumes the availability of a suitable forced landing area in case of engine failure. If a suitable forced landing area is not available, the P* should accelerate the aircraft to minimum single-engine airspeed prior to establishing the desired climb rate.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2652
TASK: Perform cruise flight checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain airspeed 110 KIAS, ±10 KIAS.
5. Maintain altitude ±100 feet.
6. Maintain heading ±10 degrees.
7. Maintain the aircraft in trim.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will establish straight-and-level flight at 110 KIAS. He will remain focused outside the aircraft to avoid traffic or obstacles and will acknowledge the results of the fuel check.
2. The P will focus his attention primarily inside the cockpit; however, as his workload permits, he will assist in clearing the aircraft. He will announce when his attention is focused inside the cockpit; for example, when calling out instrument indications during the instrument correlation check. The P will record initial fuel figures, fuel flow computation, and burnout and reserve times. He will announce when he initiates the fuel check and when he completes the fuel check. The P also will announce the results of the fuel check.
3. The crew will note any unusual vibrations, noises, or instrument indications and sensor operations.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2654
TASK: Perform autorotation RPM check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS, with the landing check completed, at a predetermined entry altitude and airspeed.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly predetermine autorotation RPM for ambient temperature and gross weight and Nr noted at record altitude.
5. Identify a suitable emergency landing area within gliding distance.
6. Maintain entry airspeed 80 KIAS, ±5 KIAS.
7. Maintain the aircraft in trim.
8. Complete a recovery to powered flight before descending below 500 feet AGL.
9. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will predetermine autorotation RPM required, record pressure altitude, free air temperature, and fuel quantity. At record altitude, he will announce and record Nr. The P will announce adequate warning for corrective action if limits for Nr, aircraft trim, or airspeed may be exceeded.
2. The P* will remain focused outside the aircraft to avoid traffic or obstacles. Prior to initiating the autorotation, the P* will direct the P to monitor Nr, aircraft trim, and airspeed. The P* will announce initiation of the autorotation and any deviation during the autorotation. He will climb to a selected record altitude from which a full power recovery can be completed before descending below 500 feet AGL. The P* will climb to a minimum of 1,000 feet above record altitude and establish levelflight at 80 KIAS. He will ensure that a suitable emergency landing area is within gliding distance.
3. The P* will reduce collective to less than 54 percent dual-engine torque. Without exceeding 110 percent single-engine torque, he will retard either engine power lever to IDLE and verify that the engine remains operational. The P* will reduce collective to the fully down position and monitor Nr to ensure that it does not exceed limitations. He will stabilize rotor RPM within allowable limits and retard the other engine power lever to IDLE, observing rotor RPM for excessive decay. The P* will verify that the second engine remains operational. He will attain a stabilized 80 KIAS autorotation before reaching record altitude. The P* will note any abnormal vibrations and verify that aircraft controllability remains normal.
WARNING If it becomes apparent that Nr will decay below 90 percent, advance both power levers to FLY, abort the maneuver, and return to base. |
4. The P* will initiate a power recovery by advancing both power levers to FLY. He will ensure that Np is 100 percent and that torque matching is in effect before increasing the collective. Before descending below 500 feet AGL, the P* will complete the power recovery by smoothly increasing the collective to assume normal cruise flight.
CAUTION An excessive application of collective from low torque conditions may cause rotor RPM decay. |
NOTE 1: Excessive rotor RPM decay during a normal power recovery may indicate an inoperable or a maladjusted collective potentiometer.
NOTE 2: When possible, all autorotation RPM checks should be performed over a prepared surface (such as a runway) where crash facilities are available.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2656
TASK: Perform attitude-hold check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain selected altitude ±200 feet.
5. Maintain airspeed at 110 KIAS, ±10 KIAS.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will establish straight-and-level flight at 110 KIAS. He will remain focused outside the aircraft to avoid traffic or obstacles. The P* will note true airspeed correlation and verify that TRIM FEEL and all ASE switches are engaged. He will engage the HAS switch, relax control pressures, and verify that the aircraft attitude remains approximately the same. The P* will perform 15-degree bank angle turns, left and right, and observe that sideslip does not exceed one-half the trim ball displacement. He will then return to level flight. The P* will actuate the cyclic ASE release switch and will verify that all ASE switches unlatch and that the aircraft becomes less stable but remains controllable. He will reengage the ASE switches, as required, and then resume normal cruise flight.
2. The P will focus his attention primarily outside the aircraft. He will announce when his attention is focused inside the cockpit; for example, when recording the results of the attitude-hold check.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2657
TASK: Perform stabilator system check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain entry airspeed 110 KIAS, ±10 KIAS.
5. Maintain altitude ±100 feet.
6. Maintain heading ±10 degrees.
7. Maintain the aircraft in trim.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce when he initiates the maneuver, his intent to abort or alter the maneuver, and when he completes the maneuver. He will remain focused outside the aircraft throughout the maneuver. The P* will establish straight-and-level flight at 110 KIAS and note the KTAS. He will engage the NOE/APPR switch and reduce collective and coordinate cyclic as necessary to gradually reduce airspeed at the selected altitude. The P* will slow to less than 80 KTAS and then increase collective and apply cyclic to initiate a gradual level flight acceleration above 80 KTAS.
2. The P will focus his attention primarily inside the cockpit; however, as his workload permits, he will assist in clearing the aircraft. He will announce stabilator repositioning to 25 degrees TED and record the KTAS. During the acceleration, the P will announce when the stabilator initiates automatic programming and record the KTAS.
NOTE: An excessive nose-low attitude may be experienced with abrupt torque and cyclic application during the acceleration. The P* should avoid excessive pitch angles throughout the maneuver.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2658
TASK: Perform maneuvering-flight checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain entry airspeed 110 KIAS, ±10 KIAS.
5. Maintain the aircraft in trim.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce when he initiates the maneuver, his intent to abort or alter the maneuver, and when he completes the maneuver. He will remain focused outside the aircraft throughout the maneuver. The P* will establish straight-and-level flight at 110 KIAS and note vibration levels and control positions. He will reduce collective to 20 percent torque; initiate a descent; and note any rotor instability, vibrations, or abnormal control positioning. The P* will maintain 110 KIAS and initiate a climb by increasing collective to attain maximum continuous torque available. He will note any rotor instability or unusual control positioning. The P* will then return to normal cruise flight and smoothly perform 60-degree bank angle turns, left and right, at 110 KIAS. He will note any rotor instability, vibrations, or unusual control positioning and then will resume normal cruise flight.
2. The P will focus his attention primarily outside the aircraft. He will announce when his attention is focused inside the cockpit; for example, when recording the results of the maneuvering-flight checks.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2660
TASK: Perform Vh check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain altitude ±100 feet.
5. Maintain the aircraft in trim.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will remain focused outside the aircraft and will announce his intent to initiate the maneuver. While maintaining altitude and a level-flight attitude, he will smoothly increase collective until a maximum torque, Ng, TGT, or airspeed limit is reached. The P* will note any abnormal vibrations or control responses and will verify that the collective does not reach the fully up position before an allowable limit of engine performance is reached. He will then resume normal cruise flight.
2. The P will focus his attention primarily inside the cockpit; however, as his workload permits, he will assist in clearing the aircraft. He will announce adequate warning for corrective action if limits for torque, Ng, TGT, or airspeed may be exceeded. The P will announce when his attention is focused inside the cockpit; for example, when recording the results of the Vh check.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2662
TASK: Perform engine performance check, minimum torque.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly predetermine the test altitude and minimum torque.
5. Maintain test altitude ±200 feet.
6. Maintain the aircraft in trim.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* and P will set their altimeters to 29.92 inches, and the P* will ensure that the anti-ice switches are off.
2. The P* will announce when he initiates the maneuver, his intent to abort or alter the maneuver, and when he completes the maneuver. He will remain focused primarily outside the aircraft throughout the maneuver. However, when possible, he will focus his attention inside the cockpit on the instruments to avoid exceeding aircraft limitations. The P* will establish 110 KIAS cruise flight at the predetermined test altitude and initiate the torque check by increasing dual-engine torque to 80 percent. He must increase airspeed to maintain the test altitude. The P* will identify the nontest engine power lever and retard it, as necessary, to establish a minimum of 10 percent torque split between the engines but not less than 60 percent torque on the nontest engine. He will slowly increase collective to reach the minimum torque required on the test engine and maintain the minimum torque required for 10 seconds on the test engine. The P* will reduce collective, ensure that the rotor RPM is 100 percent, and then advance the power lever of the nontest engine to FLY. He will repeat the check for the other engine if necessary.
3. The P will focus his attention primarily inside the cockpit; however, as his workload permits, he will assist in clearing the aircraft. He will announce adequate warning for corrective action if limits for torque, Ng, or TGT may be exceeded. The P will record Ng, torque, PA, FAT, and engine oil pressure. He will compare PA, FAT, and torque produced at maximum power to the minimum torque required for the PA and FAT. The P will determine if engine performance is satisfactory. He will announce when his attention is focused inside the cockpit; for example, when recording or analyzing the results of the engine performance check.
NOTE: Do not exceed Ng limits or allow the Nr and Np to droop more than 2 percent during the check.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TM 55-2840-248-23
TASK 2664
TASK: Determine TGT limiter setting/contingency power check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Predetermine an altitude that will allow completion of the check without exceeding torque limits.
5. Correctly determine the TGT limiter setting, and verify contingency power enabled on the test engine.
6. Maintain test altitude ±200 feet.
7. Maintain the aircraft in trim.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* and P will set their altimeters to 29.92 inches, and the P* will ensure that the anti-ice switches are set as required.
2. The P* will announce when he initiates the maneuver, his intent to abort or alter the maneuver, and when he completes the maneuver. He will remain focused primarily outside the aircraft throughout the maneuver. However, when possible, he will focus his attention inside the cockpit on the instruments to avoid exceeding aircraft limitations. The P* will establish 110 KIAS cruise flight at the predetermined test altitude and initiate the TGT limiter check by increasing the engine torque to 80 percent. He must increase airspeed to maintain the test altitude. The P* will identify the nontest engine power lever and retard it, as necessary, to establish a minimum of 10 percent torque split between the engines but not less than 60 percent torque on the nontest engine. If the TGT limiter is not reached, the P* will increase collective until the TGT limiter is reached without exceeding Ng or single-engine torque limits. The P* must not allow the Nr to droop more than 4 percent and must allowindications to stabilize at the limiter for 10 seconds. He will reduce collective until the combined torque of both engines is less than the torque noted on the test engine while at the limiter. The P* will then retard the power lever of the nontest engine to IDLE to enable contingency on the test engine and will ensure that the engine remains stable at IDLE. He will increase collective in small increments until he notes 10 degrees above the limiter TGT on the test engine. The P* must not exceed any limitations. He will reduce collective and advance the power lever of the nontest engine to FLY.
3. The P will focus his attention primarily inside the cockpit; however, as his workload permits, he will assist in clearing the aircraft. He will announce adequate warning for corrective action if limits for torque, Ng, or TGT may be exceeded. The P will record TGT indications and note torque while stabilized at the limiter. He will determine if engine performance is satisfactory. The P will announce when his attention is focused inside the cockpit; for example, when recording or analyzing the results of the check.
CAUTION Monitor Nr throughout the maneuver, particularly when increasing the collective or retarding a power lever. A 2 percent droop in Nr is sufficient to determine when at the limiter. Never allow Nr to droop more than 4 percent during the maneuver. |
NOTE 1: Sufficient altitude must be maintained to allow time for the crew to react if the test engine fails.
NOTE 2: The TGT responds extremely fast to even small collective changes when contingency power is enabled.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TM 55-2840-248-23
TASK 2666
TASK: Perform communication and navigation equipment checks.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The PLT will perform the ADF radio check by verifying proper lock onto the selected station, steady needle response, and proper tracking/station passage indications. The PLT will not tune the ADF in flight if he is performing P* duties.
2. The CPG will announce all doppler destination changes and will verify the heading. Using the HSI, the PLT will acknowledge and verify the selected doppler course. The CPG will perform doppler update and target store procedures. The CPG will not program the doppler in flight if he is performing P* duties.
3. The PLT will check the transponder by verifying proper functioning with an ATC facility or a tactical radar site.
4. The PLT and CPG will adjust avionics to required frequencies. They will establish communications with the appropriate ATC facility to verify acceptable extended transmission and reception ranges, if possible.
REFERENCES:
TM 11-1520-238-23 series
TM 55-1520-238-10
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2668
TASK: Perform weapon systems check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS.
STANDARDS:
1. Ensure that weapon systems are properly safed and cleared.
2. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
3. Correctly check and perform all items in sequence.
4. Establish entry airspeed less than 100 KTAS.
5. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will announce when he initiates the checks and when he completes the checks. He will remain focused outside the aircraft throughout the maneuver. He will establish an airspeed less than 100 KTAS and will position the MASTER ARM switch to SAFE.
2. The CPG will place the CPG ARM switch to SAFE and the weapons select switches to NORMAL/ON, as appropriate. He will place the SIGHT SEL switch to HMD or HMD/TADS and will select gun (G) with the WAS. The CPG will verify normal gun articulation without abnormal vibrations. He will select rockets (R) with the WAS and will verify normal pylon articulation without abnormal vibrations. The CPG also will verify that the solid rocket cursor is displayed.
3. The P* will increase airspeed to above 100 KTAS.
4. The CPG will verify that the pylons articulate to flight stow and do not respond to head movement and that an open rocket cursor is displayed above 100 KTAS. He will position the rocket select switch to GND STOW and verify that the pylons remain in flight stow. The CPG will then deselect rockets with the WAS.
5. The P* will reduce airspeed below 100 KTAS, and the CPG will verify that the pylons articulate to ground stow. The crew will reposition the weapons select switches and the MASTER ARM switch, as required, and the P* will resume normal cruise flight.
REFERENCES:
TM 9-1090-208-23-1
TM 9-1090-208-23-2
TM 9-1230-476-20-1
TM 9-1230-476-20-2
TM 9-1270-476-20-1
TM 9-1270-476-20-2
TM 9-1270-476-30
TM 11-5895-1184-23
TM 55-1520-238-10
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series
TASK 2669
TASK: Perform special/detailed procedures.
CONDITIONS: In an AH-64 helicopter with equipment installed.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF, with changes for equipment installed, and use additional publications as required.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION: The crew will check any additional/special equipment installed in the aircraft and demonstrate knowledge of the system and published operational checks. They also will demonstrate knowledge of published charts, graphs, and work sheets. They may perform selected checks orally.
REFERENCES:
AR 95-1
AR 95-3
TM 1-1500-328-23
TM 55-1520-238-10
Applicable publications for equipment installed
TASK 2670
TASK: Perform engine shutdown check.
CONDITIONS: In an AH-64 helicopter or an AH64CMS and given TM 55-1520-238-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-238-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-238-MTF.
2. The aircrew and the ground crew, if available, will clear the area around the aircraft during the engine shutdown and will announce when their checks are completed.
REFERENCES:
TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series