C.  Procedure
(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 or CAPT & OBS
2) C86 F/O AUDIO or F/O & EQUIP RACK

(2)  
Remove the Push-To-Talk (PTT) Switch on 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.

(c)  
Disconnect the terminal lugs from the switch. 1) Make sure the disconnected wire ends do not touch.

(d)  
Remove the locking screw from the clamp.

(e)  
Turn the PTT switch in a counterclockwise direction to remove it from the clamp.

(f)  
Remove the PTT switch from the clamp.

500 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  23-52-21 Page 401 

H36938
Control Wheel PTT Switch - Removal/Installation  500 
23-52-21  Figure 401  May 01/98 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Control Wheel Push-To-Talk (PTT) Switch Installation (Fig. 401)
A.  General
(1)  
This task installs the PTT switch on the control wheel. There are two parts to this task. The first part installs the upper PTT switch and the second part installs the lower PTT switch.

(2)  
Use the first part if the airplane has only the momentary PTT switches. Use the first and the second part if the airplane has a momentary and a detent PTT switch.

B.  Access
(1)  Location Zone
101 Control Cabin - Left
102 Control Cabin - Right

C.  Procedure
(1)  Install the Push-To-Talk Switch on the Control Wheel:
(a)  
Do these steps for the top MIC PTT switch: 1) Put the PTT switch in the top switch mount on the clamp. 2) Turn the switch in a clockwise direction until the switch makes contact with the

trigger and the ball makes contact with the switch mount detent. 3) Install the locking screw in the clamp. 4) Connect the terminal lugs to the switch you installed (see detail C). 5) Make sure you connect the correct wire on the correct terminal. 6) Carefully push the clamp into the recess in the control wheel. 7) Install and tighten the two mounting screws on the control wheel.

(b)  
Do these steps for the lower INT PTT switch: 1) Put the PTT switch in the lower switch mount on the clamp. 2) Turn the switch in a clockwise direction until the switch makes contact with the

trigger. 3) Turn the switch counterclockwise . turn. 4) Install and tighten the locking screw in the clamp. 5) Move the trigger up and down. 6) If the trigger does not stay in the detented position, turn the switch
counterclockwise until the switch stays in the detented position.
500 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  23-52-21 Page 403 

7) Connect the terminal lugs to the switch you installed (Detail C). 8) Make sure you install the correct wire on the correct terminal. 9) Carefully push the clamp into the recess in the control wheel. 10) Install and tighten the two mounting screws on the control wheel.
(2)  
Remove the DO-NOT-CLOSE tag and close the circuit breakers:

(a)  P6 Load Control Center - Right
1) C83 CAPT AUDIO or CAPT & OBS
2) C86 F/O AUDIO or F/O & EQUIP RACK

(3)  
Do the Push-To-Talk (PTT) Switch Installation Test task (Ref para. 4)

4.  Push-To-Talk (PTT) Switch Installation Test
A.  General
(1)  This task does a test of the PTT switch you installed.
B.  References
(1)  24-22-00/201, Manual Control
C.  Access
(1)  Location Zone
101 Control Cabin - Left
102 Control Cabin - Right

D.  Procedure
(1)  
Supply electrical power (Ref 24-22-00/201).

(2)  
Do a Test of the Installed PTT Switch:

(a)  
At a pilot’s Audio Selector Panel (ASP), set the audio selection to the flight interphone system.

(b)  
Push the Control Wheel PTT switch to the MIC position.

1)  On airplanes with a Control Wheel detent PTT switch; make sure the switch stays in the detent position.

(c)  
Make a voice announcement.
1) Make sure you hear the announcement.

(d)  
On airplanes with a Control Wheel detent PTT switch; push the PTT switch again. Make sure the switch goes to the (center) off position.
　
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