TM 1–1520–238–T–1
4–116
Change 5
4–17 APU – INTERACTIVE FD/LS CHECK (cont)
4–17
TASK
RESULT
c. On DEK, press and
release ()/0 and
VWX/8 keys (ADC).
On CDU, press and
release 0 and 8 keys
If any MUX NO–GO appears
on HOD, refer to
TM 9-1230-476-20-2 for
troubleshooting the MUX
system.
(ADD).
When MUX
COMMUNICATION GO
appears on the HOD, go to
next step.
NOTE
RHE – RT BUS NO–GO RH FAB (ACZ) and/or
RHE – LT BUS NO–GO RH FAB (ACZ) will
appear if both pilot and CPG SAFE/ARM
switches are off.
d. Perform APU
start–up (para 3–3)
with two exceptions:
(1) Pause before
performing step 10
in the APU
Operating
Instructions until
prompted by the
FD/LS check.
(2) If the APU is not
going to be placed
on–line as
aircraft power
source, omit steps
11 and 12.
If APU start sequence does
not begin, refer to
TM 1-1520-238-T-8.
On the pilots center circuit
breaker panel (fig. 2–6), if
FUEL BST, FUEL APU, APU
HOLD, and aft avionics bay
circuit breaker panel
(fig. 2–50), APU circuit
breakers do not stay closed,
refer to TM 1-1520-238-T-8.
Upon successfully completing
this step, go to next step.
e. On DEK, press and
release ABC/1 and
STU/7 keys (ADC).
On CDU, press and
release 1 and 7 keys
(ADD).
When the prompt (message)
MOVE APU START SWITCH
TO START THEN RELEASE
appears on HOD, perform
step 10 in the APU –
Operating Instructions.
If one or more FD/LS
NO–GO displays listed
appear on the HOD, perform
the following in sequence:
