TM 1–1520–238–T–1
3–20
Change 8
3–3
APU – OPERATING INSTRUCTIONS (cont)
3–3
NOTE
The main transmission and nose gearboxes
oil temperature and pressure readouts are
dynamic displays. The operator can view the
readouts on the CPG heads out display
(HOD) or any selected pilot/CPG crew station
video monitor.
If ECS air temperature is very warm and
cannot be adjusted with TEMP control,
shutdown APU.
14. Monitor transmission oil temperature and pressure every
30 minutes (or as required) of APU operation.
a. On data entry keyboard (DEK), set DATA ENTRY
switch to FD/LS (ADC).On CDU, select FDLS FAB
(ADD).
b. Obtain maintenance menu by pressing and releasing
any DEK key except ENTER SPACE or SHIFT (ADC):
any CDU key except SPC (ADD).
c. On DEK, press and release ABC/1 and YZ*/9 keys
(ADC). On CDU, press and release 1 and 9 keys
(ADD).
d. To return to the maintenance FD/LS menu and abort
the FD/LS transmission check, set DATA ENTRY
switch to STBY and repeat steps a and b (ADC) or
press and release any key on the CDU except SPC
(ADD).
15. Proceed with the applicable FD/LS check or maintenance
task as required.
16. Shutdown APU as specified in following procedures.
NOTE
On Back Up Control System (BUCS) aircraft,
set GEN 2 switch to OFF/RESET then GEN 1
switch to OFF/RESET.
a. On ELEC PWR panel, set GEN 1 switch to
OFF/RESET and GEN 2 switch to OFF/RESET.
NOTE
Allow APU to roll down before proceeding with
following procedures.
b. On APU/FIRE TEST panel, set APU
START/RUN/OFF switch to OFF.
c. On ELEC PWR panel, set BATT/OFF/EXT PWR
switch to OFF.
17. Detach aircraft battery (TM 1-1520-238-23).
18. Secure all access doors opened during APU –
OPERATION INSTRUCTIONS (TM 1-1520-238-23).
END OF TASK
