(c)
Carefully pull the leads through the conduit and into the J-Box until the sensor is against the conduit end.
(d)
Install the sensor with the mounting bolts and spacers.
(e)
Tighten the conduit coupling nut to the sensor by hand.
(f)
Install the lockwire to the coupling nut.
(g)
Pull the wires out through the J-Box, and if it is necessary, cut the wires to the correct length.
(h)
Install new terminal lugs on the ends of the sensor wires.
(i)
Connect the lugs to the terminal strip (Ref WDM 32-61-13 for the primary sensor, WDM 32-61-22 for the alternate sensor).
(j)
Make a check of the correct wire color and the terminal locations of the electrical connections.
S 392-060
CAUTION:_______MAKE SURE YOU SEAL THE ELECTRICAL TERMINALS. IF YOU DO NOT SEAL THE ELECTRICAL TERMINALS, CONTAMINATION CAN GET INTO THEM AND CAUSE DAMAGE TO THE SENSORS.
(2)
Seal the electrical terminals:
(a)
Clean the surface of the terminals with the solvent.
(b)
Apply a thin layer of the primer on the surface of the terminals and let the primer dry.
(c)
Apply the sealant on the surface of the terminals with a short bristle brush.
(3)
Install the junction box cover.
S 432-019
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747-400 MAINTENANCE MANUAL
S 862-020
(4)
After the alternate sensor installation, remove the DO-NOT-CLOSE tag and close this circuit breaker on the overhead circuit breaker panel, P7:
(a)
7F23, LANDING GEAR DSP & CONT ALTN
S 862-021
(5)
After the primary sensor installation, remove the DO-NOT-CLOSE tag and close this circuit breaker on the overhead circuit breaker panel, P7:
(a)
7F22, LANDING GEAR DSP & CONT PRI
S 862-022
(6)
Put the airplane back to the ground mode (AMM 32-09-02/201).
S 742-023
(7)
Do the ground test for the PSEU (AMM 32-09-03/501).
S 722-072
(8)
Do the task " Test of the Up Sensor for the Nose Landing Gear ".
S 862-073
WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(9) Remove the lock on the door for the nose landing gear if the sensor installation is completed (AMM 32-00-30/201).
TASK 32-61-02-702-061
4. Test of the Up Sensor for the Nose Landing Gear_______________________________________________
A. General
(1) This test makes sure the Up Sensor of the Nose Landing Gear operates correctly.
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747-400
MAINTENANCE MANUAL
(2)
Do this test of the sensors with the landing gear in the down and locked position.
B.
References
(1)
AMM 24-22-00/201, Electrical Power
(2)
AMM 32-00-30/201, Landing Gear Door Locks
C.
Equipment
(1)
A32102-25 Proximity Sensors Actuator/Deactuator Set (Preferred)
(2)
A32102-25 Proximity Sensors Actuator/Deactuator
Set (Optional) or
(3)
KHT 8-750-01 Go-Gauge (Actuator), ELDEC
Corporation, Aircraft Systems Division, PO Box
3002, Bothell, WA, 98041-3002
(Optional to A32102-25 or A27092-84)
D. Access
(1)
Location Zone
114 Nose Gear Wheel Well - RH
222 Control Cabin - RH
715 Nose Landing Gear
E.
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