(6)  
Install downlock sensor support beam cover.

(7)  
Close all circuit breakers opened in 2.B.(1).

(8)  
Apply electrical power to airplane.

(9)  
Check that all landing gear green lights are illuminated, that no landing gear red lights are illuminated, and that landing gear aural warning is silent.

(10)
Determine if there is a further need for electrical power on airplane; if not, shut down source.

500 
Jun 20/87  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-51 Page 401 

Downlock Sensor and Sensor Actuator Installation  500 
32-61-51 Page 402  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/67 

505  Downlock Sensor and Sensor Actuator Installation 
Nov 15/68  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-51 Page 403 

3.  Removal/Installation Nose Gear Downlock Sensor Actuator
A.  General
(1)  Whenever a nose gear lock brace, a downlock sensor support beam or a sensor actuator is replaced, the following procedure must be followed to position or reposition the downlock sensor actuator.
B.  Equipment and Material
(1)  
Ground Lock Assemblies (Ref 32-00-01)

(2)  
Nose Gear Sensor Actuator Locating Tool - SE 32-6001 or F80191-1

C.  Remove Nose Gear Downlock Sensor Actuator
(1)  
Check that ground lock assemblies are in place (Ref 32-00-01).

(2)  
Drill out four rivets holding actuator mounting bracket to nose gear lock brace. Remove sensor actuator assembly (Fig. 401).

D.  Install Nose Gear Sensor Actuator
(1)  
Remove cover from downlock sensor support beam (Fig. 401).

(2)  
Remove sensor mounting bolts and allow sensor to hang on electrical leads.

(3)  
Position nose gear sensor actuator locating tool in place of sensor and install mounting bolts, do not tighten.

(4)  
Adjust sensor adjusting tool midpoint of travel using adjusting screw. Tighten mounting bolts.

(5)  
Rivet sensor actuator mounting bracket to nose gear lock brace.

(6)  
Install sensor actuator on sensor actuator locating tool.

(7)  
Drill two 5/32 inch holes through sensor actuator and sensor actuator mounting bracket.

(8)  
Remove sensor actuator from locating tool.

(9)  
Remove locating tool.

(10)
Install downlock sensor. Do not tighten mounting bolts.

(11)
Jack nose of airplane until nose wheel is clear of ground (Ref Chapter 7, Jacking).

(12)
Remove nose gear ground lock assembly (Ref 32-00-01).

(13)
Manually unlock nose gear.

(14)
Manually retract gear far enough so that lock brace is clear of downlock sensor support beam.

(15)
Rivet downlock sensor actuator to sensor actuator support bracket using two holes drilled in step (7).

(16)
Extend gear and install ground lock assemblies (Ref 32-00-01).

(17)
Check that landing gear control lever is in OFF position.

(18)
Adjust sensor adjusting screw for a gap between sensor face and sensor actuator as indicated on Fig. 401. Tighten sensor mounting bolts.

(19)
Install cover on downlock sensor support beam.

(20)
Test downlock sensor (Ref 32-61-0, Adjustment/Test).

(21)
Lower airplane and remove jacks (Ref Chapter 7, Jacking).

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