(e)
Make sure the latch fittings and the serrated plates
(4 locations) are installed.
(f)
Make sure the "X" dimension (Detail C) on the forward and aft ends of the latch torque tube do not differ by more than
0.06 inch.
(g) Adjust the "X" dimension to adjust the forward and aft locations of the latch torque tube, if it is necessary. 1) Open the door. 2) Remove the "C" washers from one end of the latch torque
tube and install at the other end to adjust the "X" dimension. 3) Make sure to install the open end of "C" washers in different positions. 4) Make sure the end play on the latch torque tube is less than 0.024 inch.
CAUTION: MAKE SURE THE SEALANT BEADS DO NOT TOUCH THE BERAING.
_______ THIS WILL NOT LET THE BEARING MOVE FREELY.
5) Apply 4 beads of sealant as shown in Section B-B to keep the "C" washers in their positions.
(h)
Close and latch the door.
(i)
Make sure the end clearance between the latch roller and the latch fitting is 0.10 to 0.15 inch (Detail C).
(j)
Adjust the clearance between the latch roller and the latch fitting, if it is necessary. 1) Remove the washers from one side of the latch crank and
install at the other side to adjust the clearance.
(k)
Adjust the flushness of the door skin and body skin as shown in Fig. 502 and adjust the latch roller clearance (Section A-A). 1) Make sure when you measure the flushness and the initial
latch roller clearance, these conditions exit: a) The door is in the fully closed and latched position. b) The upper and lower gate pushrods are disconnected. c) All four latch rollers are in contact with the inboard
surfaces of their fittings.
2) Loosen the attachment bolts on the latch fittings and move the fittings to get the correct flushness and the initial latch roller clearance (0.10 to 0.19 inch) (Detail C and Section A-A)
NOTE: The 0.10 to 0.19 inch dimension is an initial
____ clearance. You will adjust the final clearance after the upper gate is adjusted.
S 825-014
(3) Adjust the guide arm (Detail I, Fig. 501):
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
CAUTION: MANUALLY LIFT THE LOWER GATE WHEN YOU CLOSE THE DOOR WITH
_______ THE LOWER PUSHROD DISCONNECTED. DO NOT TRY TO CLOSE THE DOOR WITH THE LOWER GATE DOWN. THIS CAN CAUSE DAMAGE TO THE SPLINE TORQUE SHAFT ON THE GIRT BAR MECHANISM.
(a)
Do a check of the guide arm bearings. Make sure that the guide arm roller pin bearings are not worn or damaged. Replace any guide arm bearing that is worn or damaged.
(b)
Manually lift the lower gate and close and latch the door.
NOTE: You can use a flexible cord to keep the lower gate in
____
the up position.
(c) Get access through the lower hinge cavity opening. Remove the shrink sleeve (if installed).
NOTE: It is not necessary to install a new shrink sleeve.
____
(d)
Loosen the bolt that connects the guide arm to the support fitting in the hinge housing.
(e)
Loosen the guide arm adjuster fitting locknuts. Make the guide arm shorter with the adjuster fitting. Make sure the guide arm bolt can move up and down freely in the support fitting and the hinge housing.
NOTE: Make sure that the guide arm has no force.
____
(f)
Make sure that the bolt head touches the support fitting. Use a torque wrench and tool ST-2580-524 to measure the torque required to move the bolt up in this unloaded condition.
(g)
Turn the adjuster fitting to lengthen the guide arm. Make sure that the head of the bolt touches the support fitting. Use a torque wrench and tool ST2450-524 to measure the torque required to move the bolt up. Make sure that the the torque required to move the bolt up is 5 to 20 pound-inch over the torque required to move the bolt with no force on the guide arm.
NOTE: The guide arm must be adjusted for the longest length to
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