(e)  
Push the FLT INT or INT microphone selector switch on the captain's ASP. 1) Make sure the LED light comes on.

 (f)  
Make voice communication between the captain's station and the ground crew at the nose wheel well area. 1) Make sure the communication can be made.

 D. Put the Airplane Back to the Usual Condition:
 S 864-012
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
 AUDIO SELECTOR PANEL - REMOVAL/INSTALLATION
___________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task is the removal of an Audio Selector Panel (ASP). The second task is the installation of an ASP.
 TASK 23-51-21-004-001
 2.  Audio Selector Panel Removal
____________________________
 A.  Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right

 B.  Procedure
 S 864-002
 (1)  Open the circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6 Load Control Center - Right 1) For the captain's and the observer's audio selector panel: 2) C240, CAPT BATT INPH 3) C239, CAPT NO. 2 INPH 4) For the first officer's audio selector panel: 5) C560, F/O NO. 2 INPH 6) C561, F/O BATT INPH 7) For the captain's audio selector panel: 8) C83, CAPT AUDIO 9) For the first officer's audio selector panel: 10) C86, F/O AUDIO 11) For the observer's audio selector panel: 12) C85, OBS AUDIO 13) For all the audio selector panels: 14) C84, INPH AND WARN
 S 024-003
 (2)  Remove the ASP:
 (a)  Loosen the four screws in the corners of the top of the ASP panel.
 CAUTION:  DO NOT HOLD THE ASP CONTROL KNOB TO PULL THE ASP OUT.
_______ DAMAGE TO THE EQUIPMENT CAN OCCUR.
 (b)  Hold the ASP at the top and bottom edges with two hands.
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A
737-300/400/500
MAINTENANCE MANUAL

SCREW(4 LOCATIONS)

EXAMPLE CONFIGURATION

Audio Selector Panel Removal/Installation
Figure 401

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737-300/400/500MAINTENANCE MANUAL
 (c) Disconnect the electrical connector from the rear of the ASP.
 TASK 23-51-21-404-004
 3.  Audio Selector Panel Installation
_________________________________
 A.  References
 (1) AMM 24-22-00/201, Manual Control
 B.  Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right

 C.  Procedure
 S 424-005
 (1) Install the ASP:
 (a)
Connect the electrical connector to the rear of the ASP.

 (b)
Hold the ASP at the top and bottom edges with two hands.

 (c)
Put the ASP in the applicable panel.

 (d)
Tighten the four screws in the corners of the ASP.

 S 864-006
 (2) Remove the DO-NOT-CLOSE tag and close the circuit breakers:
 (a) P6 Load Control Center - Right
 1)  For the captain's and the observer's audio selector panel: a) C240, CAPT BATT INPH b) C239, CAPT NO. 2 INPH
 2)  For the first officer's audio selector panel: a) C560, F/O NO. 2 INPH b) C561, F/O BATT INPH
 3)  For the captain's audio selector panel: a) C83, CAPT AUDIO 4) For the first officer's audio selector panel: a) C86, F/O AUDIO 5) For the observer's audio selector panel: a) C85, OBS AUDIO 6) For all the audio selector panels: a) C84, INPH AND WARN
　
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