15-1.5 APU OPERATIONAL CHECK
Ext Hydraulic Power Off
APU Start Accumulator Charged to 2850 Psi
APU Visual Check Performed (Task 15-1.4)
Helicopter Positioned Nose into Wind
Rotor Blades Positioned So That One Aft Blade is
Behind and 30 Degrees Off Centerline
None General Safety Instructions:
Medium Helicopter Repairer (2)
Keep hands away from flight controls.
Application of hydraulic power will
cause flight controls to move and rotor
blades to flap. Injury to personnel can
Ext Electrical Power Off
Set BATT switch (1) to ON.
MASTER CAUTION lights (2) shall come on. If not, go to
Press pilot's MASTER CAUTION light (2).
MASTER CAUTION lights (2) shall go out. If not, go to
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.
Post fireguard at APU.
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.
Position helper to observe bite indicators on ESU (7).
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.
If Bite #1 is already white, this task resets it to
black, along with the other BITE indicators.
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15-16 Change 23