THRUST REVERSER HYDRAULIC SYSTEM PRESSURE SWITCH - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Thrust Reverser Isolation Valve Ground Lock Cap and Pin Assembly - F80109-3 or F80109-9 or equivalent
2. 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. Remove access panel from forward wing-to-body fairing to gain access to pressure switch.
3. Remove Hydraulic System Pressure Switch
A. Disconnect electrical connector from pressure switch. (See figure 401.)
B. Remove clamp attaching pressure switch to support bracket.
C. Remove pressure switch from T-fitting.
NOTE: Rotate switch with a wrench at the switch fitting to keep from breaking tack weld.
4. Install Hydraulic System Pressure Switch
A. Install pressure switch in T-fitting. (See figure 401.)
NOTE: Rotate switch with a wrench at the switch fitting to keep from breaking tack weld.
B. Attach pressure switch to bracket with clamp.
C. Connect electrical connector to pressure switch.
D. Reactivate thrust reverser hydraulic system by removing ground locks from isolation valves.
E. Perform isolation valve indicating system test to check for proper operation of pressure switch and to check hydraulic lines for leaks. Refer to 78-36-01, Thrust Reverser Indicating Systems -Adjustment/Test.
F. Replace access panel on wing-to-body fairing.
525
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-36-41 Page 401
H27673
Thrust Reverser Pressure Switch Installation 500
78-36-41 Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/72
