500  Landing Gear Safety Sensors Installation 
May 15/67  Figure 401 (Sheet 2)  32-09-200 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

LANDING GEAR SAFETY SENSORS - ADJUSTMENT/TEST
1.  Landing Gear Safety Sensor Adjustment
A.  Landing Gear Ground Safety Sensor Adjustment
(1)  
Equipment and Materials

(a)  Ground Lock Assemblies - F72735, F72735-7 (Ref 32-00-01)

(2)  
Adjust Landing Gear Ground Safety Sensor

(a)  
With weight of airplane resting on landing gear and safety sensor protective cover in place, loosen ground safety sensor mounting bolts (Fig. 501).

(b)  
Slide sensor on mounting bracket to obtain gaps in Fig. 501 between sensor face and actuator. Tighten mounting bolts.

(c)  
Check that hydraulic system is depressurized (Ref 29-11-0 MP and 29-12-0 MP). Check that leading gear control lever is in DN or OFF position, main and nose landing gear are down and locked and ground lock assemblies are installed in all gear (Ref 32-00-01).

(d)  
Check that external electrical power supply is connected.

(e)  
Close all circuit breakers on landing gear circuit breaker panel P6.

(f)  
Check that air and ground sensing test lights on landing gear electrical module are off and landing gear control lever is prevented from being placed in UP position.

(g)  
Disconnect teleflex cable at right main gear upper torsion link.

(h)  
Energize air safety sensor by moving landing gear air safety sensor actuator to maintain the gap per detail A between sensor face and actuator.

(i)  
Check that air and ground sensing test lights come on and control lever can be placed in UP position without use of override trigger.

(j)  
Connect teleflex cable at right main gear upper torsion link.

(k)  
Test operation of landing gear safety sensors.

510 
Jun 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-09-200 Page 501 

B.  Landing Gear Air Safety Sensor Adjustment
(1)  Equipment and Materials
(a)  
Ground Lock Assemblies (Ref 32-00-01)

(b)  
Rigging Pin SB-3 - 0.311 +0.000/-0.002 inch diameter, minimum length 1.5 inches (MS20392-4)

NOTE: Rigging pin is part of F70207-61.
(2)  Adjust Landing Gear Air Safety Sensor
(a)  
Check that ground lock assemblies are installed in all gear (Ref 32-00-01).

(b)  
With protective cover in place, loosen air safety sensor mounting bolts (Fig. 501).

(c)  
Jack airplane until all tires clear ground (Ref Chapter 7, Jacking Airplane).

(d)  
Install rigging pin SB-3 through ground spoiler interlock valve yoke. Check that rigging pin fits freely.

(e)  
Slide sensor on mounting bracket to obtain the gap per detail A between sensor face and actuator. Tighten mounting bolts.

(f)  
Remove rigging pin SB-3.

(g)  
Test operation of landing gear safety sensors.

(h)  
Lower airplane and remove jacks (Ref Chapter 7, Jacking Airplane).

2.  Landing Gear Safety Sensors Test
A.  Equipment and Material
(1)  
Ground Lock Assemblies (Ref 32-00-01)

(2)  
Axle Jack for Right Main Landing Gear

B.  Prepare to Test Landing Gear Safety Sensors
(1)  
Jack airplane until all tires clear ground (Ref Chapter 7, Jacking Airplane).

(2)  
Check that hydraulic system is depressurized, landing gear control lever is in DN or OFF position, main and nose landing gear are down and locked, and ground lock assemblies are installed in all gear (Ref 32-00-01).

(3)  
Check that external electrical power supply is connected.

(4)  
Check that all circuit breakers on landing gear circuit breaker panel P6 are closed.

(5)  
Deflate right main gear shock strut by removing valve cap from charging valve and loosening air release nut one or two turns.

510 
32-09-200 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/90 

WARNING:  DO NOT LOOSEN VALVE BODY UNLESS SHOCK STRUT IS COMPLETELY DEFLATED. AIR PRESSURE CAN BLOW VALVE BODY OUT, CAUSING INJURY TO PERSONNEL.
C.  Test Landing Gear Safety Sensors
(1)  
Place landing gear control lever in UP position and check that control lever moves freely into UP position without use of override trigger.

(2)  
　
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