TM 1-1520-238-T-6
9–464
9–206. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 1 – PILOT STATION) –
9–206
MAINTENANCE OPERATIONAL CHECK (cont)
1. Perform the maintenance operational check as follows:
Task
Result
a. On electrical power distribution box, detach
P4.
If short exists, go to paragraph 9–208.
b. Check for short between:
P4-M and ground,
P4-N and ground.
c. On pilot ELEC PWR panel (fig. 9–172), set
BATT/EXT PWR switch to EXT PWR.
M69–217
BATT / EXT PWR
SWITCH
Figure 9–172.
Pilot ELEC PWR Panel
d. Check for 28 VDC at (A402):
J4-M and J4-N.
If 28 VDC is not present, go to paragraph 9–23 to
troubleshoot dc electrical power generation.
e. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to OFF.
f. On electrical power distribution box, attach
P4.
g. On pilot aft circuit breaker panel (fig. 9–173)
check that the following circuit breakers are
closed:
STAB MAN DC (CB6),
ECS CANOPY ANTI-ICE
CONTR (CB70),
ECS WSHLD WPR (CB71),
ECS ENG ANTI-ICE (CB67),
POWER BATT CHGR DC (CB5),
and CBR BLWR (CB94).
h. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to EXT PWR.
