747-400 AMM 飞机维护手册 舱门 DOORS 2(98)

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 EXAMPLE: Assume 4 turns remain until stops are
_______ contacted. The 3 required turns minus the 4 actual turns equals -1 turn. Use 9 |1/4 turns ( 8 |1/4 minus -1).
 6)  When the switch is correctly adjusted, install the lockwire and locknuts.
 (c)  Do the initial adjustment for the latches closed switch as follows:
 NOTE: Use this procedure only if you adjust a replacement
____ switch. If you will adjust the initial switch, go to the switch operational check.
 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 approximately 1 to 2 feet.
 2)  Loosen the locknuts and adjust the switch in the bracket to get the initial position (View A-A).
 3)  Set the latch actuator in the external stops closed position (Fig. 510) as follows: a) Use a torque wrench with a dial indicator to manually
 turn the actuator clockwise at 25 |5 pound-inches. b) Find the position at which the manual torque increases by 15-20 pound-inches. c) Turn the manual drive 1/2 turn counterclockwise.
 NOTE: This is when the external stops are touched.
____
 d)  Make sure the plunger for the latches closed switch is
 not fully pushed in.
 4)  Turn the latch actuator 15 turns counterclockwise.
 5)  Make sure the striker plate does not touch the switch
 plunger.
 6)  Disconnect electrical connector DX225C from the cargo door junction box.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (d)

A
747-400 MAINTENANCE MANUAL
 7)  As you turn the latch actuator 8 |1/4 turns clockwise (switch actuates 7 |1/4 turns prior to external stops [closed] position [Fig. 510]), adjust the switch to get a continuity between pins 9 and 10 of connector DX225C.
 NOTE: The switch must operate as the latch actuator is
____ turned to the closed stops (clockwise). One turn of the limit switch locknut will change the switch operation point approximately one turn on the latch actuator.
 8)  Connect electrical connector DX225C to the cargo door junction box.
 9)  Turn the latch actuator counterclockwise to the fully open
 position before you operate the door.
Do the operational check of the latches closed switch as
 follows:
 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 electrically 1 to 2 feet. 2) Fully close the door electrically.
 NOTE: You must close the door electrically, since the
____ latch position at electrical shutoff finds if the switch setting is acceptable.
 3)  Use a torque wrench with a dial indicator to apply 25 |5 pound inches torque to the manual drive of the latch actuator in the clockwise direction.
 4)  Carefully count the number of turns that remain until the external stops are touched (Fig. 510).
 NOTE: The external stops must be touched in 3 |1 turns.
____
 5)  If the external stops are not touched in 3 |1 turns, do these steps: a) Subtract the actual number of turns that remain from
 the 3 turns. b) Subtract this difference from 8 |1/4 turns.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 c)  Do the initial latches closed switch adjustment and replace the new value for the 8 |1/4 turns.
 EXAMPLE: Assume 1 turn remains until stops are
_______ contacted. The 3 required turns minus the 1 actual turn equals 2 turns. Use 6 |1/4 turns (8 |1/4 minus 2).
　
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