TM 1-1520-238-T-6
9–504
Change 5
9–233. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 3 – PILOT STATION) –
9–233
MAINTENANCE OPERATIONAL CHECK (cont)
1. Perform the maintenance operational check as follows:
Task
Result
a. Detach P1, P2 and P4.
b. Check for short between P4-K and P4-L and
ground.
If short exists, go to paragraph 9–235.
c. On pilot ELEC PWR panel (fig. 9–182), set
BATT/EXT PWR switch to EXT PWR.
M69–244
BATT / EXT PWR
SWITCH
Figure 9–182.
Pilot ELEC PWR Panel
d. Check for 28 VDC at (A402):
J4-K and J4-L.
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 and attach P1, P2, and
P4.
f. On pilot circuit breaker panel (fig. 9–183),
check that the following circuit breakers are
closed:
Circuit Breaker
MISSION PNVS DC (CB61)
NAV HARS DC (CB54)
NAV DPLR (CB82)
NAV AIR DATA DC (CB69)
NAV EGI (CB97)
MISSION FC DC (CB50)
MISSION RKT ELEX (CB47)
ASE DC (CB28)
ECS ICE DET (CB68)
ECS BLADE DE-ICE CONTR (CB85)
ECS BLADE DE-ICE (CB3)
STAB AUTO DC (CB93)
MISSION EL DC (CB83)
MISSION DTU (CB98)
