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A
747-400
MAINTENANCE MANUAL
B
FORWARD ROTARY ACTUATOR
C SEE B
C B
OUTBD
FWD ROTARY ACTUATOR (SHOWN WITH DOOR OPEN)
TORQUE
SHAFTTORQUE ADAPTORTUBE SWITCH
ACTUATOR
NUT WASHER WASHERBOLT DOOR OPEN
STOP
SWITCH
ADJUSTMENT NUTS
ACTUATOR STOP
OUTBD DOOR UP
LOCKWASHER
SWITCH 1
FWD
AFT ROTARY ACTUATOR
A
AFT ROTARY ACTUATOR
B
SEE A
ROTARY ACTUATOR ARM
SEE D
B
ACTUATOR
SUPPORT
STRUCTURE
SEE C
CONDUIT
BRACKET
A
2
TORQUE ACTUATOR SWITCH TUBE
WASHER
A
DOOR OPEN
STOP
SWITCH ADJUSTMENT NUTS
ACTUATOR
STOP
FWD DOOR UP
LOCKWASHER
SWITCH
OUTBD
FORWARD ROTARY ACTUATOR
B
CONDUIT BRACKET
ROTARY
A-A ACTUATOR
1 THIS SWITCH IS ON THE AFT ACTUATOR ON THE FORWARD DOOR AND ON THE FORWARD ACTUATOR ON THE AFT DOOR.
2 ON THE AFT CARGO DOOR FORWARD
ROTARY ACTUATOR ONLY.
Cargo Door Rotary Actuator
Figure 401 (Sheet 1)
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MAINTENANCE MANUAL
ROTARY ACTUATOR
SHIM
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A
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MAINTENANCE MANUAL
AFT CARGO DOOR C-C
PRESS-FIT BUSHING INSTALLATION
Cargo Door Rotary Actuator
Figure 401 (Sheet 3)
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MAINTENANCE MANUAL
(3)
AIPC 52-34-09
(4)
AIPC 53-34-01
C.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
(2)
Access Panel
821R Door - Forward Cargo Compartment
822R Door - Aft Cargo Compartment
D.
Procedure
S 014-030
CAUTION:_______IN CASE THE DOOR DOES NOT OPEN, STOP IMMEDIATELY. DO NOT OPERATE THE DOOR CONTROL SWITCH. HOLDING THE DOOR CONTROL SWITCH MAY DAMAGE THE ACTUATOR. WAIT AT LEAST 1 MINUTE BEFORE SECOND ATTEMPT. IF THE DOOR STILL DOES NOT OPEN, WAIT AT LEAST 10 MINUTES BEFORE THIRD ATTEMPT.
(1)
Open the door to the vertical position.
S 864-015
(2)
If you cannot open the door, do these steps:
(a)
With the hooks and latches closed, operate the master latch lock handle to release the latches and open the pressure relief doors.
(b)
Disconect the swivel clamp from the forward rotary actuator arm to loosen the conduit (Fig. 402).
(c)
For the forward actuator in the aft door, remove the fasteners and disconnect the two clamps to loosen the conduit (Fig. 402).
(d)
Disconnect the door lift links from the door support fittings.
NOTE:____Do not change the length of the door lift links. Note location of press-fit bushings at link disconnect points. These bushings are not part of linkage assembly and must be in place when reconnecting links.
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