(b)
Make sure there is continuity between pins 1 and 2 on the switch.
(c)
Push in on the switch plunger.
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MAINTENANCE MANUAL
DOOR-DOWN DOOR-UP SWITCH SWITCH (2 LOCATIONS) (2 LOCATIONS)
DOOR-WARNING
MIDSPAN
SWITCH
LATCH
TORQUE
TUBE
MIDSPAN LATCH-OPEN
MIDSPAN SWITCH
LATCH-OPEN
SWITCH
LATCHES OPEN SWITCH
MASTER LATCH-LOCK SWITCH
LATCH LOCK
HOOK-SECTOR
CLOSED SWITCH
LOWER LATCH (2 LOCATIONS) CLOSED CAM SHAFT LATCHES
DOOR-
SWITCH
CLOSED
SWITCH
HOOK-OPEN
SWITCH
(2 LOCATIONS)
Side Cargo Door Sequence Switches Figure 601
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747-400 MAINTENANCE MANUAL
(d) While you hold the switch plunger in, make sure there is continuity between pins 1 and 3 on the switch.
S 866-006
(4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers for the side cargo door:
(a)
P415 Power Distribution Center - Right
1) 415F17 SIDE CARGO DOOR CONT
(b)
P715 Aux/Ext No. 2 Power Center
1) SIDE CARGO DOOR PWR
S 866-007
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR AND
_______ THE DOOR OPENING WHEN YOU OPERATE THE DOOR. FAILURE OF THE LIFT MECHANISM COULD CAUSE THE DOOR TO CLOSE QUICKLY WHICH COULD CAUSE INJURY OR DAMAGE.
(5)
Open the side cargo door electrically (Ref 52-32-00/001).
S 866-008
(6)
Open these circuit breakers for the side cargo door and attach DO-NOT-CLOSE tags:
(a)
P415 Power Distribution Center - Right
1) 415F17 SIDE CARGO DOOR CONT
(b)
P715 Aux/Ext No. 2 Power Center
1) SIDE CARGO DOOR PWR
S 766-005
(7) For these sequence switches on the side cargo door, do a continuity check as follows:
-
Door down switches
-
Door closed switch
-Hook closed switches
-Latches closed switch
(a)
Get access to the switch.
(b)
Make sure there is continuity between pins 1 and 2 on the switch.
(c)
Push in on the switch plunger.
(d)
While you hold the switch plunger in, make sure there is continuity between pins 1 and 3 on the switch.
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A 747-400 MAINTENANCE MANUAL
(8) S 866-009Remove the DO-NOT-CLOSE tags and close these circuit breakers for the side cargo door: (a) P415 Power Distribution Center - Right 1) 415F17 SIDE CARGO DOOR CONT (b) P715 Aux/Ext No. 2 Power Center 1) SIDE CARGO DOOR PWR
(9) S 866-010Close the side cargo door (Ref 52-32-00/001).
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