(m)  
Place AUTOBRAKE selector switch to MIN position.

(n)  
Check that AUTOBRAKE DISARM light comes on in 1 to 4 seconds.

(o)  
Place AUTOBRAKE selector switch to OFF position.

(p)  
Disconnect tester from antiskid module.

E.  Restore Airplane to Normal
(1)  
Remove throttle position protractor.

(2)  
Determine if there is further need for electrical power on airplane; if not, shut down sources.

(3)  
Determine if there is further need for hydraulic power on airplane; if not, remove systems A and B hydraulic power (Ref 29-11-0 and 29-12-0).

5B1 32-09-100 Oct 20/86 Page 518
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

LANDING GEAR SAFETY SENSORS - DESCRIPTION AND OPERATION
1.  General
A.  The landing gear safety sensors provide signals to solid state circuits in the landing gear electrical module to energize or de-energize the safety relays depending upon whether the airplane is airborne or on the ground. The sensors are mounted near the ground spoiler (lockout) valve above the right main gear (Fig. 1). The sensors are proximity switches that sense the presence or the absence of a metal actuator. A double-paddle metal actuator to actuate the sensors is connected to the spoiler valve linkage. The spoiler valve linkage is operated through a teleflex cable by extension and compression movement of the shock strut. Linkage movement positions the actuator near or away from the respective sensor to provide the appropriate signal to the landing gear electrical module.
B.  For the nose gear air ground switch, you can find the information in the Thrust Reverser Control System - Description and Operation (Ref 78-34-01).
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Oct 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-09-200 Page 1 

Landing Gear Safety Sensors  500 
32-09-200  Figure 1  May 15/67 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

LANDING GEAR SAFETY SENSORS - REMOVAL/INSTALLATION
1. General
A.  The landing gear safety sensors provide electrical control of certain systems of the airplane. When performing maintenance on the safety sensors, the systems controlled by air-ground sensing should be shut down (Ref 32-00, Landing Gear Air-Ground Sensing).
B.  The landing gear ground and air safety sensors are attached to the ground spoiler interlock valve support. The removal and installation procedures are the same for either sensor (Fig. 401).
C.  For the airplanes with the nose landing gear air ground switch, you can find the
removal/installation for this switch in 78-34-61.

2.  Equipment and Material
A.  Ground Lock Assemblies (Ref 32-00-01)
3.  Remove Landing Gear Safety Sensors
A.  Open all circuit breakers on landing gear circuit breaker panel (P6-2).
B.  Check that ground lock assemblies are installed in all landing gear (Ref 32-00-01).
C.  Remove sensor from mounting bracket (Fig. 401).
D.  Remove sensor lead clamp from ground spoiler interlock valve bracket.
E.  Remove sensor leads from wire bundle.
F.  Disconnect electrical connector at body station 675 right and remove sensor pin contacts from connector insert.
NOTE: Mark or record pin location of color coded leads for installation of new sensor.
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4.  Install Landing Gear Safety Sensors
A.  Check that all circuit breakers on landing gear circuit breaker panel (P6-2) are open.
B.  Check that gear ground lockpins are installed in all landing gear.
C.  Position landing gear safety sensor in place on mounting bracket but do not tighten mounting bolts (Fig. 401).
NOTE:  Check that mounting bolts for air safety (upper) sensor are installed with head forward.
D.  Thread sensor leads through clamp and install clamp on ground spoiler interlock valve bracket.
E.  Twist sensor leads together and insert leads in wire bundle. Tie and clamp wire bundle.
F.  Trim sensor leads to length, install pin contacts on lead ends, and install pin contacts in connector insert in correct pin locations as noted in par. 3.F.
G.  Connect electrical connector.
H.  Adjust and test sensor in accordance with adjustment/test procedure.

Landing Gear Safety Sensors Installation  500 
32-09-200  Figure 401 (Sheet 1)  Feb 01/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 
　
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