32-61-01
ALL ú ú 01 Page 215 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
NOSE GEAR UP SENSOR - MAINTENANCE PRACTICES
___________________________________________
1. General_______
A. This procedure contains four tasks. These tasks are remove, install, test, and adjust the up sensors for the nose landing gear.
B. The primary and alternate up sensors are found in the pressure pan recess. The recess is in the aft bulkhead of the wheel well for the nose gear. The equipment number for the primary up sensor is S396, and for the alternate up sensor it is S411.
C. The sensor leads are connected to the terminal strip T389 which is in the J27 junction box. The junction box is found above the sensors on the aft bulkhead of the wheel well for the nose gear. When the nose gear is in the up position, the trunnion crank on the retraction actuator is the sensor's target.
D. A correctly installed sensor will give the correct clearance as shown in Fig. 201. The clearance adjustment is usually not necessary after the removal and installation of the sensor.
TASK 32-61-02-002-042
2. Remove the Up Sensor for the Nose Gear______________________________________
A. Standard Tools and Equipment
(1)
Plastic scraper, that is not abrasive or conductive
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 32-00-30/201, Landing Gear Door Locks
(3)
AMM 32-09-02/201, Air/Ground Relay System
(4)
IPC 32-61-08 Fig. 2
(5)
WDM 32-61-13, Nose Gear Primary Display
(6)
WDM 32-61-22, Nose Gear Alternate Display
C.
Access
(1)
Location Zone
114 Nose Gear Wheel Well - RH
D.
Prepare for the Removal
S 862-043
WARNING: MAKE SURE THE GROUND LOCKS AND THE STEERING LOCKOUT PIN ARE
_______ INSTALLED ON THE NOSE. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR OR TURN OF THE NOSE WHEEL CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Make sure the ground locks and steering lockout pin are installed on the nose gear (AMM 09-11-00/201).
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32-61-02
ALL ú ú 01 Page 201 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 862-045
WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OD THE DOOR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) Install the door locks for the nose gear (AMM 32-00-30/201).
S 042-051
WARNING: MAKE SURE YOU PREPARE THE AIRPLANE FOR THE AIR MODE BEFORE YOU
_______ OPEN THE CIRCUIT BREAKERS THAT FOLLOW. THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS IN THE AIR MODE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Prepare the airplane for the air mode (AMM 32-09-02/201).
S 862-002
(4)
For the alternate sensor removal, open this circuit breaker on the overhead circuit breaker panel, P7, and attach a DO-NOT-CLOSE tag:
(a)
7F23, LANDING GEAR DSP & CONT ALTN
S 862-003
(5)
For the primary sensor removal, open this circuit breaker on the overhead circuit breaker panel, P7, and attach a DO-NOT-CLOSE tag:
(a)
7F22, LANDING GEAR DSP & CONT ALTN
E.
Remove the Up Sensor (Fig. 201)
S 032-052
(1)
Disconnect the sensor wires:
(a)
Remove the junction box (J27) cover.
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