(c)
Check that rigging pin can be removed and installed freely.
(d)
Replace lockwire as required after adjusting.
(4) Remove rigging pins.
I. Test thrust reverser operation (Ref 78-32-01). Check for correct gap between proximity sensor and sensor slug (View 2, Sheet 3, Fig. 401); adjust as shown.
540
78-34-32 Page 412 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/81
6. Restore Airplane to Normal Configuration
A. Install wing access panel 6301 on left wing or 6401 on right wing.
B. Install engine midfairing access panels.
C. Install engine forward fairing.
D. Install engine side cowl panels.
E. Install tailpipe fairings.
F. Install feedback control access panel.
G. Reactivate thrust reverser hydraulic system by removing ground locks from both thrust reverser isolation valves.
500
Feb 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-34-32 Page 413
THRUST REVERSER ISOLATION VALVE - REMOVAL/INSTALLATION
1. Prepare for Removal
A. Remove hydraulic pressure from thrust reverser system.
(1)
Remove pressure from main landing gear down line by moving landing gear selector lever to OFF and placarding.
(2)
Remove alternate hydraulic pressure by depressurizing standby hydraulic system. Refer to Chapter 29, Hydraulic Power.
(3)
Remove pressure from return lines by depressurizing hydraulic system reservoirs. Refer to Chapter 29, Hydraulic Power.
B. Lower air conditioning equipment bay doors.
2. Remove Isolation Valve (See figure 401.)
A. Disconnect electrical connector from receptacle on isolation valve.
B. Disconnect hydraulic lines from ports on isolation valve and cap lines.
C. Remove restrictor check valve from the No. 2 port and save for reinstallation.
D. Remove bolts and washers securing isolation valve to bracket on front spar, and remove valve.
3. Install Isolation Valve (See figure 401.)
A. Position isolation valve on bracket on front spar and attach to bracket with bolts and washers.
B. Install restrictor check valve in the No. 2 port.
C. Remove caps from hydraulic lines and connect lines to ports on isolation valve.
D. Connect electrical connector to receptacle on valve.
525
Feb 15/71 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-34-42 Page 401
4. Restore Airplane to Normal
A. Pressurize hydraulic system. Refer to Chapter 29, Hydraulic Power.
B. Operate thrust reverser per 78-32-01, and check isolation valve hydraulic lines for leaks.
WARNING: PERSONNEL MUST STAY CLEAR OF THRUST REVERSER WHEN IT IS ACTUATED TO PREVENT BEING CAUGHT BY ROTATING DEFLECTOR DOORS.
Close air conditioning equipment bay doors.
525
78-34-42 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/71
H30097
500 Thrust Reverser Isolation Valve Installation
May 15/70 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-34-42 Page 403
NOSE GEAR AIR-GROUND SWITCH ASSEMBLY - REMOVAL/INSTALLATION
EFFECTIVITY
AIRPLANES WITH NOSE GEAR AIR-GROUND SWITCH
1. General There are two nose gear air-ground switches (S529 and S530).
A. The nose gear air-ground switches are supported by a bracket in the lower nose compartment, outboard of the nose wheel well left side wall. The assembly may be reached through panel 3104 located on the left forward part of the nose wheel well (Fig. 401).
2. Equipment and Materials
A. Gear Ground Lockpin - F72735, for each landing gear
3. Remove Nose Gear Air-Ground Switch Assembly
A. Check that all landing gear ground lockpins are installed.
B. Open all thrust reverser circuit breakers on panel P6.
C. Disconnect electrical wiring from the switches (Fig. 401).
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