(b)
Connect the pushrod.
(c)
Close and latch the door.
(d)
Change the length of the gate pushrod until the upper gate touches the inner surface of the body skin.
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747-400
MAINTENANCE MANUAL
(e) Change the length of the latch pushrod one-half turn at a time to get the correct overcenter dimension (Detail F).
NOTE: The overcenter dimension for the upper gate that shown
____
in Detail F are minimum dimension.
There are no maximum upper gate overcenter dimension. This allows freedom in rigging the handle torque and handle torque peak position. In addition, if the upper gate overcenter dimension is too large, it may cause the stop pins to bottom out during unlatching operation.
(f) After each adjustment of the latch pushrod, make sure the adjustment of the upper latch roller clearance is as shown in Section A-A.
NOTE: When you change the length of the latch pushrod, it
____ changes the clearance between the latch roller and the latch fitting.
S 825-017
(6)
Adjust the torque that is necessary to latch and unlatch the door.
(a)
Install a torque wrench and adapter on the internal handle shaft.
NOTE: You can also measure the torque at the handle with a
____ spring scale. The spring scale must measure 0 to 30 pounds. Attach the spring scale to the handle at a distance 18 inches from the center of the handle shaft and pull the spring scale perpendicular to the handle.
(b)
Make sure the door is closed and latched.
(c)
Attach a ruler to the door structure to measure the position of the torque wrench (or door handle if you use a spring scale). 1) Align the ruler to measure the distance that a point
16 inches from the center of the handle shaft moves. 2) Make sure the ruler reads zero when there is no play in the torque wrench (or handle if you used a spring scale).
(d)
Measure the distance the torque wrench (or handle) moves and the torque (or spring scale force) that is necessary to unlatch the door. 1) Slowly unlatch the door with the torque wrench (or spring
scale). 2) Make a note of the maximum torque (or spring scale force) that is necessary to unlatch the door. 3) Make a note of the distance that is on the ruler when the maximum torque occurs. 4) Do the measurement again to make sure the measurements are correct.
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(e)
(f)
(g)
(h)
(i)
(j)
(k)
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747-400 MAINTENANCE MANUAL
The satisfactory unlatching torque is from 220 to 400 pound-inches (13.0 to 22.0 pounds on the spring scale).The satisfactory distance is from 0.70 to 2.5 inches at a point 16 inches from the center of the handle shaft (2.5 to 9.0 degrees).If the distance and the torque are satisfactory, no adjustment is necessary.If the distance and the torque are not satisfactory, do these steps:
NOTE: One-haft turn of the gate pushrod changes the unlatching
____
torque by 50 to 100 pound-inches (2.75 to 5.50 pounds
force on the spring scale).
~.............................................................. | CONDITION | ADJUSTMENT | ................................................................ |Both the torque and |Make the upper gate pushrod and | |the distance are less |the upper latch pushrod longer | |than the satisfactory | | |amount | | ................................................................ |the torque is less than |Make the upper gate pushrod | |the satisfactory amount; |longer | |the distance is | | |satisfactory | | ................................................................ |The torque is more than |Make the upper gate pushrod | |the satisfactory amount; |shorter | |the distance is | | |satisfactory | | ................................................................ |The torque is satisfactory; |Make the upper gate pushrod | |the distance is less than |shorter and make the upper | |the satisfactory amount |latch pushrod longer | ................................................................ |The torque is satisfactory; |This is an acceptable condition | |the distance is more than |no adjustment is necessary | |the satisfactory amount | | 2.............................…................................1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 舱门 DOORS 1(40)
