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737-300/400/500MAINTENANCE MANUAL
 THRUST LEVER ACTUATED TAKEOFF WARNING SWITCHES - REMOVAL/INSTALLATION
_____________________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The tasks are a removal and an installation of the takeoff warning switches (S814 and S815) that are operated by the thrust levers.
 B.  The switches attach to the thrust lever drum assembly. Each switch has a support bracket which is forward and below the drum assembly in the pilots' control stand (Fig. 401). To get access to the switches, go through the access panels on the sides of the control stand.
 C.  You must remove the two screws at the top of each access panel. To do this it is necessary to remove the stabilizer trim wheel on each side of the control stand.
 D.  Switch S814 is related to thrust lever No. 1 and switch S815 is related to thrust lever No. 2. The removal and the installation procedures are the same for each switch.
 TASK 31-26-21-024-001
 2.  Thrust Lever Actuated Takeoff Warning Switch Removal
____________________________________________________
 A.  References
 (1)  
25-11-11/201, Flight Compartment Equipment

 (2)  
31-26-00/501, Aural Warning System

 B.  Access
 (1)  Location Zone
 101/102 Control Cabin

 C.  Procedure
 S 864-002
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Load Control Center - Right 1) LANDING GEAR LIGHTS 2) ANTI-SKID FAIL WARN AND PARK BRAKE 3) AURAL WARN

 (2)
Remove the crew seat if it is necessary (Ref 25-11-11/201).

 (3)
Remove the tie rod nut from the left stabilizer trim wheel.

 S 864-003
 S 014-004
 NOTE: It is necessary to remove the trim wheel before you remove
____ the lower access doors on the control stand.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 31-26-21
 ALL  ú ú 01 Page 401 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500
MAINTENANCE MANUAL

THRUSTTHRUST LEVERDRUM
UPPER
MOUNTING
SCREW
FORWARD CAM
STOP FOLLOWER ARM
LOWER MOUNTING SWITCH SCREW BRACKET
ASSEMBLY ENGINE NO. 2 SWITCH BRACKET ASSEMBLY
SEE A
ENGINE NO. 1 SWITCH BRACKET ASSEMBLY
TAKEOFF WARN SWITCH S815 [INBOARD OF WING ANTI-ICE SWITCH S823 (REF) ON ENG CAM FOLLOWER NO. 2 BRACKET ASSY] ARM
STOP
TAKEOFF WARN SWITCH S814
STOW SWITCH [OUTBOARD OF WING ANTI-ICE
(S827)(REF) SWITCH S822 (REF) ON ENG NO. 1 BRACKET ASSY]
ARM SWITCH
(S826)(REF)
SWITCH MOUNTING  ARM SWITCH (S824)(REF) 
SCREW 
STOW SWITCH 
BRACKET  (S825)(REF) 
ADJ SLOT 
1  REF. CHAPTER 30-11-52 FOR ADJ/TEST 
OF WING ANTI-ICE SWITCHES S822 AND 
823, REF. CHAPTER 78-34-05 MP FOR 
ADJ/TEST OF THRUST REV ARM/STOW SWITCHES S824-S827  A  1 

Control Stand Thrust Lever Takeoff Warn Switch Installation
Figure 401 (Sheet 1)

E80217
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

 31-26-21
 ú ú 02 Page 402 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

 

REF. CHAPTER 30-11-51 FOR ADJ/TEST OF WING ANTI-ICE SWITCHES S822 AND S823 REF. CHAPTER 78-34-05 MP FOR ADJ/TEST OF THRUST REV ARM/STOW SWITCHES S824-S827
Control Stand Thrust Lever Takeoff Warn Switch Installation Figure 401 (Sheet 2)
E80219
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 31-26-21
 ú ú 01 Page 403 ú Mar 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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