PROXIMITY SENSORS - REMOVAL/INSTALLATION
1.  General
A.  The thrust reverser proximity sensors are mounted on the latch support. There are two proximity sensors on each reverser. The two proximity sensors and electrical harness are an integral unit, and are removed and installed as a unit.
NOTE:  If only one sensor is defective, maintenance time can be reduced by cutting the harness and splicing in a replacement sensor. Refer to Proximity Sensors - Approved Repairs.
2.  Equipment and Materials
A.  Thrust Reverser Isolation Valve Ground Lock Cap and Pin Assembly - F80109-3 or F80109-9
B.  Sealant - Type III, Dow Corning Aerospace Sealant 90-006-2, Dow Corning Corp., Midland, Michigan or equivalent
3.  Prepare for Removal
A.  Deactivate thrust reverser hydraulic system by installing ground locks at both thrust reverser isolation valves.
WARNING:  SERIOUS INJURY CAN RESULT TO PERSONNEL IF GROUND LOCKS ARE NOT PROPERLY INSTALLED. ATTEMPT TO DEPLOY THRUST REVERSERS AFTER INSTALLING GROUND LOCKS. REVERSERS MUST NOT MOVE HYDRAULICALLY.
B.  Open BAT, NO. 1 DC and NO. 2 DC circuit breakers under INDICATOR MASTER DIM BUS on circuit breaker panel P6.
C.  Remove upper lock access panel.
D.  Remove large access panel located at bottom of thrust reverser shroud assembly.
E.  Open tailpipe fairings to gain access to electrical connector on shroud bulkhead.
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Proximity Sensors Installation  500 
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4.  Remove Proximity Sensors
A.  Disconnect electrical connector at forward side of thrust reverser shroud bulkhead (Fig. 401).
B.  Remove screws, washers and plate attaching upper and lower proximity sensors to latch support.
C.  Remove screws, nuts and washers attaching receptacle to shroud bulkhead.
D.  Remove clamps, screws, and spacers where applicable, securing electrical harness to shroud.
E.  Carefully remove proximity sensors and electrical harness from thrust reverser.
F.  Remove old sealant and clean area where shims were located.
5.  Install Proximity Sensors
A.  Position proximity sensors and electrical harness inside thrust reverser shroud (Fig. 401).
B.  Temporarily attach upper and lower proximity sensors to latch support with screws, washers and plate. Be sure shim is in place under sensor.
C.  Measure gap between each sensor and latch arm; gap must be more than 0.030 inch, preferably 0.060 to 0.090 inch. Peel laminated shim as required to obtain gap.
D.  After required gap is obtained for both sensors, remove sensors and permanently install laminated shims with Type III sealant.
E.  Reinstall proximity sensors.
F.  Attach electrical harness to shroud with clamps, screws and spacers where applicable.
G.  Attach receptacle to shroud bulkhead with screws, washers and nuts.
H.  Connect electrical connector to receptacle at forward side of shroud bulkhead.
I.  Close circuit breakers opened in step 3.B.
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J.  Reactivate thrust reverser hydraulic system by removing ground locks from both thrust reverser isolation valves.
K.  Cycle thrust reverser deflector doors and check that REVERSER UNLOCKED lights function properly (Ref 78-36-01, Adjustment/Test).
WARNING:  PERSONNEL MUST STAY CLEAR OF THRUST REVERSER WHEN IT IS ACTUATED TO PREVENT BEING CAUGHT BY ROTATING DEFLECTOR DOORS.
6.  Restore Airplane to Normal
A.  Close and latch tailpipe fairings.
B.  Attach large access panel to bottom of thrust reverser shroud assembly.
C.  Install feedback control access panel.
D.  Install upper lock access panel.
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PROXIMITY SENSORS -APPROVED REPAIRS
1.  General
A.  The electrical harness is an integral part of the proximity sensor installation. Sensor replacement normally requires replacement of the entire electrical harness. In order to reduce the maintenance time required to replace a defective sensor, the harness may be cut and spliced.
2.  Equipment and Materials
A.  Splice - Thomas and Betts BB-2, or equivalent
B.  Shrinkable Sleeving - ThermoFit RNF-100, or equivalent
　
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