MASTER MASTERLATCH-DOOR-LATCH-LOCKCLOSED LOCKSWITCHSWITCH
TORQUE TUBE
1.09 INCHES SWITCH
THIS IS THE EXTENDED BRACKET POSITION OF THE SWITCH
SWITCH SWITCH
ACTUATOR BRACKET
PLUNGER. THE PLUNGER
DOES NOT TOUCH THE
ACTUATOR HERE. 0.98 INCH
THIS IS THE EXTENDEDLATCH-POSITION OF THE SWITCHINBD LOCK PLUNGER. THE PLUNGER
DOOR SILL SECTORLATCH
DOES NOT TOUCH THE FITTING
ACTUATOR HERE.
B-B C-C
Side Cargo Door Sequence Switches
Figure 401 (Sheet 2)
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A
747-400
MAINTENANCE MANUAL
LATCHES OPEN SWITCH
HOOK LOCKNUTS (SHOWN IN OPEN POSITION)
1.17 INCHES
SWITCH
RAMP
LATCH TORQUE TUBE
MOUNTING
THIS IS THE EXTENDED
BRACKET
POSITION OF THE SWITCH
HOOK-CLOSED
PLUNGER. THE PLUNGER
SWITCH
DOES NOT TOUCH THE
SWITCH
(2 LOCATIONS)
ACTUATOR HERE.
ACTUATOR
HOOK-OPEN
SWITCH
(2 LOCATIONS)
NOTE: HOOK-OPEN SWITCH G-G OPERATES IN THIS POSITION.
D-D
LATCHES
CLOSED
THIS IS THE EXTENDEDSWITCH MIDSPAN LATCH SWITCH POSITION OF THE SWITCH
TORQUE TUBE ACTUATOR PLUNGER. THE PLUNGER DOES NOT TOUCH THE ACTUATOR HERE.
SWITCH
BRACKET
1.55
INCHES 11.49
2 3
THIS IS THE EXTENDED POSITION OF THE SWITCH PLUNGER. THE PLUNGER DOES NOT TOUCH THE SWITCH ACTUATOR HERE. MOUNTINGSWITCH BRACKET
ACTUATOR
MIDSPAN LATCH
OPEN SWITCH
LOWER LATCH
CAM SHAFT
F-F
E-E
1 THE INITIAL CLEARANCE (SWITCH 2 FOR THE AFT MIDSPAN LATCH SWITCHES: 1.52 TO 1.54 INCHES RAMP IS CLEAR OF THE SWITCH ROLLER)
3 FOR THE FWD MIDSPAN LATCH SWITCHES: 1.27 TO 1.29 INCHES
CAN CHANGE DURING DOOR ADJUSTMENT.
(REF 52032-00, ADJUSTMENT/TEST)
Side Cargo Door Sequence Switches
Figure 401 (Sheet 3)
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A
747-400 MAINTENANCE MANUAL
(b)
Latches open switch: door closed.
(c)
Latches closed switch: door not fully open.
(d)
Midspan latch open switch: door closed.
(e)
Hook open or closed switch: door not fully open.
(f)
Door up switch: door full open.
(g)
Door down switch: door closed.
(h)
Door closed switch: door not fully open.
S 864-005
(3)
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 984-006
(4)
Do these steps if you will replace the master latch lock switch:
(a)
Manually turn the latch actuator to the latches closed position (with the door open).
(b)
Close and latch the master latch lock handle to move the switch actuator in a position where the switch actuator does not touch the switch plunger.
S 984-007
(5) If you will replace the hook open or hook closed switch, manually turn the hook actuator away from the full open position.
NOTE: This will make sure the switch roller is clear of the
____
actuator ramp or hook.
D. Remove the Sequence Switch (Fig. 401)
S 034-008
(1) Disconnect the switch leads at the splices.
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