(6)  
Position the flaps with the flap control lever to the 25-unit detent and position the flaps electrically so that dimension X is an additional 25.96 to 26.11 inches from that recorded in step (5).

(7)  
Remove hydraulic power (Ref 27-51-0).

(8)  
Adjust takeoff warning switch toward its actuating cam until switch actuates.

NOTE:  Care must be taken to pre-position switch so that actuation takes place with switch body being moved toward cam.

(9)  
Lockwire switch retainer nuts.

(10)
Install switch cover on flap control unit.

(11)
Position alternate flap switch to OFF.

(12)
Replace jackscrew fairing.

(13)
Provide system A hydraulic power (Ref 27-51-0).

(14)
Position flap control lever to FLAP UP detent.

(15)
Remove system A hydraulic power (Ref 27-51-0).

501 
Feb 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-26-23 Page 401 

Flap Takeoff Warning Switch Installation  501 
31-26-23  Figure 401  Nov 15/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

501  Flap Jackscrew Measurement 
Nov 15/76  Figure 402  31-26-23 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

K.  Test flap takeoff warning switch (Ref 31-26-0, Adjustment/Test).
558 
31-26-23 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/77 

STABILIZER TAKEOFF WARNING SWITCHES –
REMOVAL/INSTALLATION

1. General
A.  The two stabilizer takeoff warning switches, the upper (APL NOSE DN) (S546) and lower (APL NOSE UP) (S132), are actuated by the upper and lower limit switch cams. The upper takeoff warning switch (S546) combines the functions of stabilizer electric actuator limit and takeoff warning. Replace lower switch (S132) per this procedure. Upper switch (S546) should be replaced per 27-41-101, Removal/Installation, although adjustment and test for the takeoff warning function can be performed per this procedure.
2.  Equipment and Materials
A. Stabilizer Actuator Trammel Bar - F80055-1
Remove Stabilizer Takeoff Warning Switch

A.  Open LIGHTS and AURAL WARN circuit breakers on P6 panel.
B.  Open access door 3701 and locate stabilizer takeoff warning switches (Fig. 401).
C.  Disconnect switch leads at splice.
D.  Remove locknut and retainer nut from switch shaft, and remove actuator arm from shaft.
E.  Remove retainer nut from switch shaft and remove switch from support bracket.
4.  Install Stabilizer Takeoff Warning Switch
A.  Position switch assembly through support bracket and install retainer nut. Lockwire nut (Fig. 401).
B.  Position actuator arm on switch shaft and set to obtain trial dimension shown in figure. Install retainer nut and locknut.
C.  Match color coded wires and splice. Ensure wires are properly routed through clamps.
D.  Close LIGHTS and AURAL WARN circuit breakers on P6 panel.
E.  Adjust upper and lower takeoff warning switch as follows:
(1)  
Open LIGHTS and AURAL WARN circuit breakers on P6 panel.

(2)  
Set dimension B as required for switch adjustment in table (Fig. 401).

(3)  
Loosen but do not remove locknut securing switch arm to switch.

CAUTION:  IF LOCKNUT IS NOT LOOSENED, DAMAGE TO WORM GEAR MECHANISM CAN OCCUR DURING ADJUSTMENT.

(4)  
Loosen worm gear locking screw and turn worm gear on opposite side until switch actuates.

(5)  
Tighten and lockwire worm gear locking screw, then tighten locknut.

(6)  
Close LIGHTS and AURAL WARN circuit breaker on P6 panel.

F.  Test stabilizer takeoff warning switch (Ref 31-26-00, Adjustment/Test).
563 
Feb 15/77  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-26-24 Page 401 

Stabilizer Takeoff Warning Switch Installation  503 
31-26-24  Figure 401 (Sheet 1)  Nov 15/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

514  Stabilizer Takeoff Warning Switch Installation 
Jun 20/88  Figure 401 (Sheet 2)  31-26-24 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

SPEED BRAKE TAKEOFF WARNING SWITCH - REMOVAL/INSTALLATION
　
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