Section II. MISSION EQUIPMENT

TM-1-1520-238-10 Helicopter Attack AH-64A Apache Manual
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TM 1-1520-238-10 9-20 Change 9 Section II. MISSION EQUIPMENT 9.16 MISSION EQUIPMENT FAILURES AND MALFUNCTIONS. Emergency operation of mission equipment is con- tained in this section, insofar as its use affects safety of flight. 9.16.1 Wing Stores Jettison. CAUTION Do not jettison Hellfire missile if hang- fire is in progress (i.e. missile is still ig- nited). a. Armament Wing Stores. 1. Airspeed – 120 KIAS maximum. 2. Selected STORES JETT switches – Activate. OR 3. ST JETT – Press. b. External Fuel Wing Stores. 1. Airspeed – 100 KIAS maximum. 2. Selected STORES JETT switches – Activate. OR 3. ST JETT – Press. 9.16.2 ENCU Malfunction. 1. ENCU switch – OFF. 2. ECS panel – STBY FAN if desired. 3. Emergency crew station ventilator door – Open if desired. 9.16.3 PNVS/IHADSS Failure. WARNING If night or simulated night NOE, reac- tion to the following malfunctions must be immediate. Exit the NOE environ- ment immediately. NOTE During rolling maneuvers, a phenomena known as AC coupling may degrade the PNVS imagery. Generally, this image deg- radation will worsen as the bank angle is increased. To reduce the adverse affects of AC coupling, the pilot should reduce the amount of sky visible within the PNVS field of view by viewing the terrain below the horizon. a. PNVS Failure. Pilot NVS select switch – TADS. Switch over to TADS WFOV. FLIR image should occur in about 3 seconds. TADS slew rates are noticeably slower in azimuth than PNVS. Some gain and level adjustment is usually nec- essary for optimum image. NOTE In the event of a GEN-1 failure, the auto- matic power transfer to GEN-2 will result in gray-scale selection in the HDU on some aircraft. Should this condition occur, resetting the VID SEL switch to TADS will restore normal video. b. IHADSS/HDU Failure. WARNING In the event of IHADSS failure with gun selected, the gun will be commanded to the fixed forward position. Once in this position, the gun can still be fired without having to re–action the gun. Pilot 1. Establish visual flight. 2. VDU control switch – PLT. 3. ACQ SEL – NVS FXD. OR CPG 1. CPG SIGHT SEL switch – NVS. 2. PLT/GND ORIDE switch – ORIDE. 3. NVS select switch – PNVS or TADS. 4. CPG assume helicopter control. 9.16.4 Dual IHADSS/HDU Failure. Pilot 1. Establish visual flight. 2. VDU control switch – PLT. 3. ACQ SEL – NVS FXD. OR CPG 1. Establish visual flight. 2. CPG assume helicopter control.

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