TM 1-1520-238-T-6
Change 7
9–487
9–220. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 2 – PILOT STATION) –
9–220
MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
h. Check that circuit breakers in step f. remain
closed.
If MISSION ARM CONTR cicuit breaker (CB46) does
not stay closed, go to paragraph 9–223.
If IR JAM XMTR cicuit breaker (CB66) does not stay
closed, go to paragraph 9–224.
If MISSION PEN AIDS CONTR cicuit breaker (CB49)
does not stay closed, go to paragraph 9–225.
If MISSION JETT cicuit breaker (CB89) does not stay
closed, go to paragraph 9–226.
If NAV VDU cicuit breaker (CB91) does not stay
closed, go to paragraph 9–227.
If FUEL TRANS cicuit breaker (CB56) does not stay
closed, go to paragraph 9–228.
If FUEL BST cicuit breaker (CB57) does not stay
closed, go to paragraph 9–229.
If TWHL LOCK cicuit breaker (CB59) does not stay
closed, go to paragraph 9–230.
If LT NAV cicuit breaker (CB73) does not stay closed,
go to paragraph 9–231.
If VIB MON cicuit breaker (CB79) does not stay
closed, go to paragraph 9–232.
If LSR DET cicuit breaker (CB96) does not stay
closed, go to paragraph 9–232.1.
i. On pilot ELEC PWR panel (fig. 9–179), set
BATT/EXT PWR switch to OFF and detach
P1 and P2.
j. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to EXT PWR.
k. Check for 28 VDC at P2-E.
If 28 VDC is not present, go to paragraph 9–223.
l. Check for 28 VDC at P2-h.
If 28 VDC is not present, go to paragraph 9–224.
m. Check for 28 VDC at P2-D.
If 28 VDC is not present, go to paragraph 9–228.
n. Check for 28 VDC at P1-49.
If 28 VDC is not present, go to paragraph 9–225.
o. Check for 28 VDC at P1-18.
If 28 VDC is not present, go to paragraph 9–226.
p. Check for 28 VDC at P1-41 and P1-42.
If 28 VDC is not present, go to paragraph 9–227.
