S 864-023
(5)
Open these circuit breakers on the overhead circuit breaker panel, P7, and attach the DO-NOT-CLOSE tags:
(a)
7F23, LANDING GEAR DSP & CONT ALTN
(b)
7F22, LANDING GEAR DSP & CONT PRI
E.
Remove the Downlock Sensor (Fig. 401)
S 034-026
(1)
Disconnect the sensor wires:
(a)
Remove the cover from the junction box.
(b)
Remove the sealing compound from the electrical terminals with the plastic scraper.
(c)
Disconnect the sensor wires from the terminal strip.
(d)
Make a note of the terminal positions and the wire color code.
(e)
Carefully remove the terminal lugs from the sensor wires to make sure the wires can be used again.
(f)
Attach a line to the wire ends to install the sensor easier.
NOTE: You will use this line to pull the sensor wires through
____ the conduit during the installation. Make sure the line is longer than the length of the conduit.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
32-61-20
ALL ú ú 01 Page 402 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
1 0.16-0.21 INCH (JURY STRUT ASSEMBLY
0.25 INCH OVERCENTER) TARGET
SENSOR
SEE A CENTERLINE UPPER
LOWER JURY AND LOWER JURY
STRUT STRUT PINS
0.25 |0.02 INCH
JURY STRUT INBD
UPPER JURY STRUT CENTERLINE APEX BOLT
A-A
INBD FWD
COVER
JUNCTION BOX, J12 LEFT, J13 RIGHT CONDUIT NUT CONDUIT
SENSORS
PRIMARY DOWNLOCK SENSOR, S399 LEFT, S405 RIGHT TERMINAL STRIP, T365 LEFT, T366 RIGHT
ALTERNATE DOWNLOCK SENSOR, S415 LEFT, S412 RIGHT UPPER JURY
STRUT
SENSOR MOUNTING SCREW
A
INBD FWD
A
1 IF THERE ARE NUISANCE GEAR LOWER JURY
DISAGREE MESSAGES ADJUST STRUT
THE SENSOR GAP TO 0.16 INCH.
DOWNLOCK SENSOR FOR THE LEFT WING GEAR IS SHOWN
DOWNLOCK SENSOR FOR THE RIGHT WING GEAR IS ALMOST THE SAME
(ALTERNATE SENSOR IS LOCATED FORWARD OF THE PRIMARY SENSOR ON THE RIGHT WING GEAR)
A
Wing Gear Downlock Sensor Installation Figure 401
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32-61-20
ALL ú ú 04 Page 403 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 024-007
(2)
Remove the downlock sensor:
(a)
Remove the conduit nut.
(b)
Remove the sensor mounting screws.
(c)
Remove the sensor and carefully pull the electrical wires from the conduit.
NOTE: Do not pull the line fully out of the conduit.
____
S 094-028
(3) Remove the line from the sensor wire ends and let the line stay in the conduit.
TASK 32-61-20-404-008
3. Install the Downlock Sensor for the Wing Gear_____________________________________________
A. Consumable Materials
(1)
A00704 Sealant - Silicone, RTV 162
(2)
B00083 Solvent - Aliphatic Naphtha, TT-N-95, Type 2
(3)
C00582 Primer - SS-4004
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
AMM 32-09-02/201, Air/Ground Relay System
(5)
AMM 32-09-03/501, Proximity Switch Electronics Unit
(6)
IPC 32-61-02 Fig. 11
C.
Access
(1)
Location Zone
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