APU OPERATIONAL CHECK

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM 55-1520-240-T 15-1.5 APU OPERATIONAL CHECK 15-1.5 INITIAL SETUP Ext Hydraulic Power Off Applicable Configurations: APU Start Accumulator Charged to 2850 Psi All APU Visual Check Performed (Task 15-1.4) Tools: Helicopter Positioned Nose into Wind Stopwatch Rotor Blades Positioned So That One Aft Blade is Materials: Behind and 30 Degrees Off Centerline None General Safety Instructions: Personnel Required: Medium Helicopter Repairer (2) Aircraft Electrician WARNING References: TM 55-1520-240-23 Keep hands away from flight controls. Application of hydraulic power will Equipment Condition: cause flight controls to move and rotor TM 55-1520-240-23: blades to flap. Injury to personnel can Battery Connected occur. Ext Electrical Power Off TASK RESULT 1. Set BATT switch (1) to ON. MASTER CAUTION lights (2) shall come on. If not, go to task 9-1.4. 2. Press pilot's MASTER CAUTION light (2). MASTER CAUTION lights (2) shall go out. If not, go to task 9-18.3. 3. Check that APU CONT NORM and EMERG circuit If circuit breaker (3 or 4) is open, close it. If either circuit breakers (3 and 4) are closed. breaker opens again, go to task 15-2.7. NOTE Post fireguard at APU. 4. Check that POWER XFR NO. 1 and POWER XFR NO. If switches (5 or 6) are ON, set them to OFF. 2 switches (5 and 6) are at OFF. 5. Position helper to observe bite indicators on ESU (7). 6. Set APU switch (8) to RUN. Hold at RUN for a BITE indicator #1 on ESU (7) changes from black to white minimum of 3 seconds. and then is reset to black. All other indicators remain black or are reset to black. NOTE If Bite #1 is already white, this task resets it to black, along with the other BITE indicators. GO TO NEXT PAGE 15-16 Change 23

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