CONTROL WHEEL PUSH-TO-TALK (PTT) SWITCH - REMOVAL/INSTALLATION
1. General
A. There are three tasks in this procedure. The first task is the removal of a PTT switch from a control wheel. The second task is the installation of a PTT switch on a control wheel. The third task is 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.
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
(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.
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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 - Unpublished Work - See title page for details. 23-52-21 Page 401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 - Unpublished Work - See title page for details.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.
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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
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