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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

7-2. INDIVIDUAL AND CREW-COORDINATED ACTIONS

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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

TM 55-1520-238-MTF.

STANDARDS:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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.

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

DESCRIPTION:

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:

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:

DESCRIPTION:

REFERENCES:

TM 55-1520-238-23 series
TM 55-1520-238-MTF
TM 55-1520-238-T series