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747-400 MAINTENANCE MANUAL
b) Tighten the jamnuts and the lockwire.
S 825-019
(6)
Adjust the midspan latch pin fittings as follows (Fig. 504):
(a)
Electrically close the door to the fully closed position.
(b)
Make sure the flushness between the door and the fuselage skin is correct (Fig. 511).
(c)
If the flushness of the door is not correct, adjust the hook pin fittings. Refer to "Adjust the Hook Pin Fittings" paragraph.
(d)
Make sure the clearance between the midspan latch pin and the bottom of the cam is as shown in Fig. 504.
(e)
If clearance is not as shown, adjust the latch pin vertically and horizontally as it is necessary to get the correct clearance and to keep the necessary door flushness.
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.
(f)
Open the door electrically as it it is necessary for access (approximately 12 to 24 inches).
(g)
Set the latch actuator in the rigged open position as follows (Fig. 511):
CAUTION: USE A TORQUE WRENCH WITH A DIAL INDICATOR (FIG. 511)
_______ TO FIND WHEN THE ACTUATOR INTERNAL STOPS ARE TOUCHED. DO NOT USE MORE THAN 70 POUND-INCHES OF TORQUE. IF YOU USE MORE THAN 70 POUND-INCHES, YOU CAN CAUSE INTERNAL DAMAGE TO THE ACTUATOR.
1) Use a torque wrench with a dial indicator to manually turn the actuator counterclockwise to the open position. 2) Examine the torque. When the torque increases by 15-20 pound-inches, you have touched the external stops. 3) Turn the latch actuator in the clockwise direction one-half turn.
NOTE: This is when the external stops are against each
____
other.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
4) Turn the torque wrench 3 turns clockwise.
NOTE: This is the rigged open position.
____
(h)
Slowly lower the door until the door side latch cams start to engage the body side latch pin fittings (Fig. 504).
(i)
Adjust the midspan latch pushrods as it is necessary to put the pin in the center of the cam throat (Fig. 504).
NOTE: This can cause a misalignment of the midspan latch
____ rig pin holes in the rigged closed position. This condition is permitted.
S 825-020
(7)
Adjust the lower latch fittings as follows (Fig. 505):
(a)
Make sure the hook pin fittings are correctly adjusted. Refer to the "Adjust the hook pin fittings" paragraph.
(b)
Adjust the guide roller latch fittings as follows (Fig. 506):
NOTE: Shims used to control the clearances between the
____ guide roller and the forward and aft ramps are not to be used to adjust the forward or aft positions of the door.
1) Make sure the door is fully closed. 2) Set the clearance between the latch cam and the bearing plate (Fig. 505).
NOTE: The guide roller must not touch the ramps.
____ Temporarily remove the ramps and shims if the roller touches the ramps.
3) Make sure the clearance between the forward guide roller ramp and the guide roller is from 0.001 to 0.030 inch. 4) If the clearance is not between 0.001 to 0.030 inch adjust as follows:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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本文链接地址：747-400 AMM 飞机维护手册 舱门 DOORS 2(89)
