TM 1-1520-238-23
1-252.6
Change 5
1.75.
APU OPERATING INSTRUCTIONS – USING EXTERNAL POWER – continued
ai. Turn off two generators.
(1) Set GEN 1 switch (19) on ELEC PWR panel
(10) to OFF/RESET.
(2) Set GEN 2 switch (21) on ELEC PWR panel
(10) to OFF/RESET.
CAUTION
The APU may be restarted after roll down
(compressor comes to a complete stop).
Wait 30 seconds for fuel to drain. The
PTO clutch duty cycle allows two consec-
utive start attempts and then a 20 minute
delay before the next start attempt. No
more than three starts shall be allowed in
a one hour period. Start attempts in which
the clutch does not engage do not apply.
Failure to comply could result in damage
to the PTO clutch.
aj. Turn off APU.
(1) Set RUN switch (16) on panel (12) to OFF.
NOTE
Allow APU to roll down before proceeding
with the following procedures.
ak. Set BATT/EXT PWR switch (9) on ELEC PWR
panel (10) to OFF.
al. Install PNVS window cover assembly
(TM 1-5855-265-20).
am. Install TADS window cover assembly
(TM 1-1270-476-20).
an. Remove external hydraulic power (para 1.73).
ao. Disconnect and remove maintenance headset
(para 1.134).
END OF TASK
PRI
RES
10
19
21
12
16
M04-1868-13A
M04-1868-23
9
10
