G42846
Nose Gear Air-Ground Switch Assembly Installation 501
78-34-61 Figure 401 Feb 20/92
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
NOSE GEAR AIR-GROUND SWITCH ASSEMBLY - ADJUSTMENT/TEST
EFFECTIVITY
AIRPLANES WITH NOSE GEAR AIR-GROUND SWITCH
1. Nose Gear Air-Ground Switch Assembly Adjustment
A. Equipment and Materials‘
(1)
Gear Ground Lockpin - F72735, for all landing gear
(2)
Airplane jacks
(3)
0.050-inch shim
B. Prepare for Adjustment
(1)
Provide electrical power to system.
(2)
Check that all landing gear ground lockpins are installed.
(3)
Jack nose of airplane until nose wheel is clear of ground (Ref Chapter 7, Jacking Airplane).
C. Adjust Nose Gear Air-Ground Switch
(1)
Disconnect upper and lower torsion links at apex bolt (View 2, Fig. 501).
(2)
Raise upper torsion link so that stop on quadrant contacts support fitting. Secure upper torsion link in vertical direction to maintain quadrant and support fittings in contact (Fig. 501).
(3)
Place 0.050-inch shim on face of switch actuating cam. Loosen switch assembly adjustment bolts and adjust air-ground switch assembly toward cam face with shim in place until either switch adjustment extreme is used or switch bottoms out from full overtravel usage. Tighten switch assembly adjustment bolts and remove shim.
(4)
Release upper torsion link and move torsion link to normal position.
(5)
Make sure there is continuity between contacts 1C and 1NC for both switches (S529 and S530).
(6)
Raise upper torsion link until quadrant and support fitting stops are in contact. Hold torsion link in position and check that 0.050-inch shim fits freely between switch roller and cam. Readjust switch assembly per step (3) as necessary.
(7)
Make sure there is no continuity between contacts 1C and 1NC for both switches (S529 and S530).
(8)
Connect upper and lower torsion links with apex bolt (Ref 32-21-31 R/I).
(9)
Test nose gear air-ground switch (Ref 78-32-01 A/T).
(10)
Lower airplane, remove jacks.
Feb 20/92 78-34-61 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G42889F54338
Nose Gear Air-Ground Switch Assembly Installation 501
78-34-61 Figure 501 (Sheet 1) Feb 20/92
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 Nose Gear Air-Ground Switch Adjustment
Sep 15/70 Figure 501 (Sheet 2) 78-34-61
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ENGINE ACCESSORY UNIT - REMOVAL/INSTALLATION
1. Remove Engine Accessory Unit
A. Open the following circuit breakers on P6 circuit breaker panel:
(1)
ENGINE NO. 1 THRUST REV DC
(2)
ENGINE NO. 2 THRUST REV DC
(3)
INDICATOR (3 places)
(4)
LANDING GEAR LIGHTS
(5)
AURAL WARN
(6)
EPR WARN
(7)
ENG 1 EPR & LG WARN
(8)
ENG 2 EPR & LG WARN
(9)
LEVER LATCH & PRESS WARN
B. Open the following circuit breakers on P18 circuit breaker panel:
(1)
FLIGHT RECORDER AC
(2)
FLIGHT RECORDER DC
C. Release latch and remove accessory unit from E3 rack shelf.
2. Install Engine Accessory Unit
A. Check that pins on rack and unit electrical connectors are straight.
B. Insert unit in E3 rack shelf and secure latch.
C. Perform checks as follows:
(1)
Close the following circuit breakers on the P18 circuit breaker panel:
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