TM 1-1520-238-T-6
Change 3
9–441
9–189. CIRCUIT PROTECTION SYSTEM (AC ESSENTIAL BUS 2 – PILOT STATION) –
9–189
MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
g. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to OFF and attach P3.
If 115 VAC is not present, go to paragraph 9–150 to
troubleshoot ac essential bus 1 – pilot station.
h. Check for continuity to T/R 2 between:
P4-A and P4-D,
P4-C and P4-F.
If continuity does not exist, go to paragraph 9–195.
i. Attach P4.
j. On pilot ELEC PWR panel (fig. 9–165), set
BATT/EXT PWR switch to EXT PWR.
k. On pilot aft circuit breaker panel (fig. 9–166),
close the following circuit breakers:
ECS ICE DET HTR (CB212),
ECS AFT FAN (CB75),
ECS FAB FANS (CB88),
POWER XFMR RECT 2 (CB4),
ECS CANOPY ANTI ICE (CB78),
POWER ENG 2 (CB44),
POWER BATT CHGR AC (CB86).
If ECS ICE DET HTR circuit breaker (CB212) does
not stay closed, go to paragraph 9–192.
If ECS AFT FAN circuit breaker (CB75) does not stay
closed, go to paragraph 9–193.
If ECS FAB FANS circuit breaker (CB88) does not
stay closed, go to paragraph 9–194.
If POWER XFMR RECT 2 circuit breaker (CB4) does
not stay closed, go to paragraph 9–195.
If ECS CANOPY ANTI ICE circuit breaker (CB78)
does not stay closed, go to paragraph 9–196.
If POWER ENG 2 circuit breaker (CB44) does not
stay closed, go to paragraph 9–197.
If POWER BATT CHGR AC circuit breaker (CB86)
does not stay closed, go to paragraph 9–198.
M69-191
CANOPY
ANTI-ICE
ECS ICE
DET HTR
ECS
AFT FAN
POWER
ENG 2
POWER BATT
CHGR AC
POWER XFMR
RECT 2
ECS
FAB FAN
Figure 9–166.
Pilot Aft Circuit Breaker Panel
