(b)  
Put the FLT INT button on the ASP to the OFF position. 1) Make sure the FLT INT light goes out.

 (c)  
Put the hand held microphones back in the holder.

 (d)  
Put the ADF or the VHF system back to the usual condition.

 S 864-014
 (6)  Remove electrical power if it is not necessary (Ref 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CONTROL WHEEL PUSH-TO-TALK (PTT) SWITCH - REMOVAL/INSTALLATION
______________________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
A removal of the PTT switch from a control wheel.

 (2)  
An installation of a PTT switch on a control wheel.

 (3)  
An adjustment of the bullet catch on the PTT switch for airplanes with a detent PTT switch.

 (4)  
A test of the operation of a PTT switch on the control wheel.

 B.  Each control wheel has a Push-To-Talk (PTT) switch installed. You can use this procedure for the two PTT switches on a control wheel.
 TASK 23-51-41-004-001
 2.  Control Wheel Push-To-Talk (PTT) Switch Removal (Fig. 401)_______________________________________________
 A.  General
 (1)  This task removes the captain's or the first officer's PTT switch from the control wheel.
 B.  Access
 (1)  Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 C.  Procedure
 S 864-003
 (1)  Open the circuit breaker and attach a DO-NOT-CLOSE tag for the applicable switch position:
 (a)  P6 Load Control Center - Right
 1) C83, CAPT AUDIO
 2) C86, F/O AUDIO

 S 024-013
 (2)  Remove the push-to-talk (PTT) switch assembly from the control wheel:
 (a)  
Remove the two mounting screws from the control wheel.

 (b)  
Carefully remove the PTT switch assembly to get access to the wires.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
CONTROL COLUMN MICROPHONE
WHEEL ASSEMBLY
SWITCH LOCKING SCREW PIN
TRIGGER
MOUNTING SCREW (2 LOCATIONS)
DETENT
INTERPHONE SCREWSWITCH PLATESWITCHMOUNT
2
SEE B
SWITCH ASSEMBLY
A1 2
MICROPHONE
SWITCH LOCKING SCREW
PIN
TRIGGER
MOUNTING SCREW (2 LOCATIONS) TRIGGER
SWITCH INTERPHONE MOUNT SWITCH MICROPHONE
SEE B SWITCH
PIN
SWITCH ASSEMBLY
SWITCH MOUNT
A3
BULLET CATCH 23
INTERPHONE SWITCHDETENT PLATE
2  3 
1  AIRPLANES WITHOUT DETENT PLATE  SWITCH MOUNT 
2  AIRPLANES WITH DETACHED DETENT PLATE 
3  AIRPLANES WITH DETENT PLATE ON SWITCH MOUNT  B 

Control Wheel Ptt Switch - Removal/Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 (c)  Disconnect the terminal lugs from the switch. 1) Make sure the disconnected wire ends do not touch. 2) Make sure the wires are clearly identified to prevent
 incorrect connections when the new switch is installed.
 S 024-014
 (3)  Remove the PTT switch from the PTT switch assembly:
 (a)  
Loosen the locking screw in the switch mount.

 (b)  
　
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