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2.  Remove Flap Takeoff Warning Switch (Fig. 401)
A.  Open LIGHTS and AURAL WARN circuit breakers on P6 panel.
B.  Remove switch cover from flap control unit .
C.  Separate wire bundle connector from receptacle.
D.  Remove two wire bundle support clamps.
E.  Cut wire bundle ties and separate takeoff warning switch leads from remainder of bundle.
F.  Remove takeoff warning switch leads from connector.
G.  Extract pin to release roller guide.
H.  Remove retainer nut from takeoff warning switch and remove switch from control unit.
I.  Replace nut, roller guide and pin on switch.
3.  Install Flap Takeoff Warning Switch (Fig. 401)
A.  Remove pin, roller guide and one retainer nut from switch .
B.  Position switch in flap control unit and install retainer nut and roller guide. Install pin to secure roller guide.
C.  Install switch leads in connector and connect to receptacle.
D.  Replace wire bundle ties.
E.  Install two wire bundle support clamps.
F.  Close LIGHTS and AURAL WARN circuit breakers on P6 panel.
G.  Deleted.
H.  Deleted.
I.  Deleted.
J.  Adjust flap takeoff warning switch, as follows:
(1)  
Provide system A hydraulic power (Ref 27-51-0, Maintenance   Practices).

(2)  
Provide electrical power.

(3)  
Check LIGHTS and AURAL WARN circuit breakers on panel P6 are closed.

(4)  
Retract the flaps with the flap control lever to their normal retracted position (zero unit detent) and hold for 5 minutes.

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 - Unpublished Work - See title page for details.  31-26-23 Page 401 

H23725 H23743
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 - Unpublished Work - See title page for details. 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 - Unpublished Work - See title page for details. 

(5)  
Remove the No. 4 jackscrew fairing and record the X dimension (Fig. 402) between the No. 4 ball screw nut and its upstop.

(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).

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).
　
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