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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
Make sure you can connect the ends of the two pressure relief door pushrods to the bellcranks.
NOTE: The bellcranks are on the torque tube for the pressure
____ relief door.
1) Adjust the lengths of the pushrods if it is necessary.Remove the clamps from the two pressure relief doors and from bellcrank on the torque tube for the pressure relief door.
NOTE: The pressure relief doors will open (0.50 inch
____ maximum) from the spring force you remove the clamps. This is the usual unpressurized condition.
Adjust the lower link for the torque tube until you can install
the rig pin LCD-1(3) (View A-A, Fig. 501).
1) Remove the rig pin.
Fully open the master latch lock handle.
1) Make sure the pressure relief doors are fully open (View
B-B, Fig. 501). If it is necessary, adjust the master latch lock handle stop (View A, Fig. 501).
NOTE: If you cannot get the door open dimension shown in
____ View B-B, and the adjustments above are correct, you can decrease the dimension given in View B-B to 7.0 inches minimum.
2) Install self-locking nut to make sure there is contact between the rubber washers (Fig. 501, View A) and the door handle housing.
NOTE:____The washers are a buffer when the door opens. The nut should still allow movement of the bolt when the washer stack is contacted by the handle in the open postion.
3) Make sure that when the handle is in the open position. 4) Make sure all the lock sectors have retracted into the web of the lower beam.
5) Make sure the lock sectors have a clearance when the latches are rotated into the open position (View D-D, Fig. 501).
6) Make sure there is 0.15 inch between the latch cams and the lock sectors.
7) If there is not a minimum of 0.15 inch between the lock sectors and the latches, do one of the steps that follow:shorten the forward and aft lower link or remove the washers at the handle open stop on the forward and aft doors to get the clearance. a) Decrease the forward and aft lower link on the forward
and aft doors to get the clearance.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
52-34-00
ALL ú ú 05 Page 525 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
b) Remove the washers at the handle open stop on the forward and aft doors to get the clearance. 8) Make sure that the pressure relief doors do not open beyond the maximim dimension (Fig. 501 view B-B).
(v) Adjust the door warning and master latch lock switches.
S 825-009
(4) Adjust the door hook mechanism (Fig. 502):
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