747-400 AMM 飞机维护手册 起落架 LANDING GEAR 8(65)

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 24.00 degrees.
 (h)  Make sure that the status of these bits on label 271 on page four of the CDU display are as follows:
 PRIMARY LOCK SWITCHES_____________________ BIT __________ DESCRIPTION
___ BIT STATUS  ___________
 R BODY GR STRNG RIGHT 27 0 UNLOCKED
 L BODY GR STRNG RIGHT 28 0 UNLOCKED
 (i)  Make sure that the status of these bits on label 273 on page five of the CDU display are as follows:
 ALTERNATE LOCK SWITCHES_______________________ BIT __________ DESCRIPTION
___ BIT STATUS  ___________
 R BODY GR STRNG RIGHT 27 0 UNLOCKED
 L BODY GR STRNG RIGHT 28 0 UNLOCKED
 (j)  
Move the Captain's Tiller for a left-hand turn (CCW) until the nose gear angle shown on the protractor (decal) is 25 degrees.

 (k)  
Make sure that the right-hand actuator on the left-hand body gear has extended .20 to 1.02 inch.

 (l)  
Make sure that the right-hand actuator on the right-hand body gear has extended .15 to .86 inches.

 (m)  
Move the Captain's Tiller for a left-hand turn (CCW) until the nose gear angle shown on the protractor (decal) is 25 to 35 degrees.

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747-400
MAINTENANCE MANUAL

 S 865-078
 (33)
 Open the 7G24 BODY GEAR STRG ARM DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-079

 (34)
 Make sure the right-hand actuators on the left and right body gear are fully retracted.

 S 865-080

 (35)
 Close the 7G24 BODY GEAR STRG ARM DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-081

 (36)
 Do a check of the body gear steering for a left-hand turn:

 (a)  
Move the Captain's Tiller for a left-hand turn (CCW) until the nose gear angle shown on the protractor (decal) is 45 degrees.

 (b)  
Make sure that the right-hand actuator on the left-hand body gear has extended 2.70 to 3.58 inches.

 (c)  
Make sure that the right-hand actuator on the right-hand body gear has extended 2.25 to 3.00 inches.

 (d)  
Move the Captain's Tiller for a left-hand turn (CCW) until the nose gear angle shown on the protractor (decal) is 65 degrees.

 (e)  
Make sure that the right-hand actuator on the left-hand body gear has extended 4.94 to 5.89 inches.

 NOTE: The actuator may be against the stop.
____
 (f)  
Make sure that the right-hand actuator on the right-hand body gear has extended 4.15 to 5.14 inches.

 (g)  
Move the Captain's Tiller to the neutral position (CW).

 I.
Test Actuator Interlock

 S 715-054
 (1)  
Do a test of the body gear steering actuator interlock:

 (a)  
Move the Captain's Tiller for a right-hand turn (CW) until the nose gear angle shown on the protractor (decal) is between 40 and 50 degrees.

 (b)  
Move the Captain's Tiller as rapidly as possible for a left-hand turn (CCW) until the tiller stop is contacted - hold it in this position.

 (c)  
Make sure that the left-hand steering actuators of both body gears retract fully before the right-hand actuators extend.

 (d)  
Move the Captain's Tiller as rapidly as possible for a right-hand turn (CW) until the tiller stop is contacted - hold it in this position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (e)  
Make sure that the right-hand steering actuators of both body gears retract fully before the left-hand actuators extend.

 (f)  
Move the Captain's Tiller to the neutral position (CCW).

 J.
Test Lever Lock Solenoid and Body Gear Centering

 S 865-055
 (1)  
Move the Captain's Tiller for a right-hand turn (CW) until the nose gear angle shown on the protractor (decal) is greater than 30 degrees.
　
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