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A
737-300/400/500MAINTENANCE MANUAL
NOSE GEAR DOWN SENSOR - REMOVAL/INSTALLATION
____________________________________________
1. General_______
A. This procedure has two tasks. These tasks remove and install the nose gear down sensor.
B. The sensor is found on the bracket above the left trunnion pin for the shock strut.
TASK 32-61-51-004-012
2. Remove the Nose Gear Down Sensor________________________________
A. Special Tools and Equipment
(1)
Ground Locks, -F72735 (AMM 32-00-01/201)
B.
References
(1)
AMM 32-00-01/201, Ground Locks
C.
Access
(1)
Location Zones
203 Nose Wheel Well
204 Nose Landing Gear
D.
Remove the Down Sensor (Fig. 401)
S 864-001
(1)
Open these circuit breakers on the P6 panel and attach DO-NOT-CLOSE tags:
(a)
AURAL WARNING
(b)
GEAR SWITCH & ANTISKID TEST
(c)
LIGHTS
S 494-002
(2)
Make sure the ground locks for the landing gear are installed (AMM 32-00-01/201).
S 034-003
(3)
Do these steps to disconnect the sensor wires:
(a)
Open the access door for the electronic equipment center, 1201.
(b)
Go through the electronic center to the area on the aft right corner of the nose wheel well.
(c)
Find the wire splices that follow (Fig. 401):
1) FOR THE PRIMARY SENSOR; splices SP410 and SP412.
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A 737-300/400/500MAINTENANCE MANUAL
DOWN SENSOR SEE B
SEE A
CONDUIT FWD
A SHIM A
SENSOR LBL 16.0 REF
TARGET SENSOR SUPPORT SHIM
SENSOR
TRUNNION PIN A ASSEMBLY TRUNNION 0.09 |0.01 INCH CLEARANCE TARGET WL 156.1 REF
B
A-A ASSEMBLY TRUNNION
Nose Gear Down Sensor Installation Figure 401 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
CONDUIT
DOWN SENSOR THE SPLICE AREA AND THE GROUND STUD ARE BEHIND THE PRESSURE SEAL
PRESSURE
SEAL
TRUNNION
FWD
Nose Gear Down Sensor Installation
Figure 401 (Sheet 2)
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737-300/400/500MAINTENANCE MANUAL
(d)
Put tags on the wires to help you connect the wires correctly during the installation.
(e)
Open the applicable splices and disconnect the wires.
(f)
Remove the third wire from its ground connection. 1) Make a record of the color of the sensor wire. 2) Put a tag on the location of the ground connection to help
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