(5)  
Retard thrust lever until switch actuates (continuity through switch). Check that thrust lever is 5.0 degrees minimum forward of idle stop.

(6)  
Advance thrust lever until switch deactivates. Check that thrust lever is 13.5 degrees maximum forward of idle stop.

(7)  
If switch does not operate at correct thrust lever position, adjust tab on switch actuator arm (Fig 401) or adjust switch in mounting slots (if provided)

(8)  
Remove ohmmeter and connect electrical wiring to switch terminals.

D.  Test warning switch
(1)  Test switch S139 or S140 (Ref 31-26-0 A/T [par. 4]).
580 
Jun 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-26-11 Page 401 

Thrust Lever Actuated Switch Installation  501 
31-26-11Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/89 

FLAP LANDING WARNING SWITCH - REMOVAL/INSTALLATION
1. General
A.  Flap landing warning and flap limit switches are mounted on the flap control unit, located in the right wheel well.
B.  The flap up limit switch is part of the flap control system and provides an input to the landing gear position and warning system as an auxiliary function. The removal/installation of the flap up limit switch is covered in Chapter 27, Flight Controls.
2.  Equipment and Materials
A.  Gear Ground Lockpin - F72735
3.  Remove Flap Landing Warning Switch (Fig. 401)
A.  Check that all gear ground lockpins are installed.
B.  Open the AURAL WARNING, LIGHTS and GEAR SWITCH & ANTI-SKID TEST, circuit breakers on panel P6-2.
C.  Remove cover from flap control unit.
D.  Remove inner checknut from flap landing warning switch and remove switch from flap control unit.
E.  Remove switch electrical leads from wire bundle up to electrical connector.
F.  Disconnect electrical connector and remove landing gear warning switch pins from connector insert.
4.  Install Flap Landing Warning Switch (Fig. 401)
A.  Insert flap landing warning switch in place in flap control unit and install inner checknut.
B.  Insert switch electrical leads in wire bundle. Tie and clamp wire bundle.
C.  Trim switch leads to length, install pin contacts on lead ends and install pin contacts in connector.
D.  Connect electrical connector.
E.  Close all circuit breakers opened in step 3.B.
F.  Adjust switch (Ref Flap Landing Warning Switch - Adjustment/Test).
G.  Replace cover on flap drive unit.

Flap Landing Warning Switch Installation  501 
31-26-12  Figure 401  Nov 15/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FLAP LANDING WARNING SWITCH - ADJUSTMENT/TEST
1. General
A.  Before adjusting flap landing warning switch, the flap system must be  rigged (Ref Chapter 27, Trailing Edge Flap System).
B.  Flap up limit switch is part of the flight control system and is adjusted and tested as part of that system (Ref Chapter 27, Limit Switches).
2.  Flap Landing Warning Switch Adjustment (Fig. 501)
A.  Adjust Flap Landing Warning Switch
(1)  
Connect external electrical power.

(2)  
Retract flaps with flap control lever to normal retracted position (zero-unit detent) and hold for 5 minutes.

(3)  
Remove No. 4 jackscrew fairing and record dimension between upstop of ball screw nut and upstop on screw yoke.

(4)  
Move flap control lever to the 10-unit detent and , if necessary, position flaps electrically so that dimension X is an additional 23.17 to 23.32 inches from that recorded in step (3) (Ref 27-51-0, Adjustment/Test).

(5)  
Remove cover from flap control unit.

(6)  
Adjust flap landing warning switch away from actuating cam until switch actuates.

NOTE: There will be an audible click as switch actuates.

(7)  
Tighten inner checknut on switch and lockwire.

(8)  
Install cover on flap control unit.

(9)  
Test switch per par. 3.

513 
Nov 15/76  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-26-12 Page 501 

Flap Landing Warning Switch Adjustment  501 
31-26-12  Figure 501  Feb 20/90 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Flap Landing Warning Switch Test
A.  Equipment and Materials
　
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