(g)  
GUN 051; Make sure you hear clear audio through the headphones.

 (h)  
Make a voice communication between the captain station and the flight interphone jack on P62.

 (i)  
Make sure you hear clear audio.

 H.  Interphone Dual Power Source Test
 S 735-010
 (1)  Do the test that follows:
 (a)  
Open these circuit breakers on the P11 panel:

 1)  11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR

 (b)  
Make a voice communication between the captain's station and the first officer's station.

 (c)  
Make sure you hear clear audio.

 (d)  
Close these circuit breakers on the P11 panel:

 1)  11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR

 (e)  
Open these circuit breakers on the P11 panel:

 1)  11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR

 (f)  
Make a voice communication between the captain's station and the first officer's station.

 (g)  
Make sure you hear clear audio.

 (h)  
Close these circuit breakers on the P11 panel:

 1)  11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR
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MAINTENANCE MANUAL

 (i)  
Open these circuit breakers on the P11 panel:

 1)  11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR

 (j)  
Make a voice communication between the captain's station and the first officer's station.

 (k)  
Make sure you hear clear audio.

 (l)  
Close these circuit breakers on the P11 panel:

 1)  11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR

 (m)  
Open these circuit breakers on the P11 panel:

 1)  11G30, INTERPHONE F/O OBS or 11G30, INTERPHONE FLT AMPL ASP 2 R PWR

 (n)  
Make a voice communication between the captain's station and the first officer's station.

 (o)  
Make sure you hear clear audio.

 (p)  
Close these circuit breakers on the P11 panel:

 1)  11G30, INTERPHONE F/O OBS or 11G30, INTERPHONE FLT AMPL ASP 2 R PWR
 S 865-011
 (2)  Remove electrical power if it is not necessary (Ref 24-22-00).
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 AUDIO SELECTOR PANEL - REMOVAL/INSTALLATION
___________________________________________
 1.  General
_______
 A.  The captain's audio selector panel (M70) and the first officer's audio selector panel (M71) are installed on the pilots' aft control stand (P8). The first observer's audio selector panel (M98) is installed on the first observer's panel (P17). The removal and installation procedure is the same for all panels.
 B.  GUN 051; The supernumerary audio selector panel (M10216) is installed on the right sidewall panel (P61). The removal and installation procedure is the same for all panels.
 C.  This procedure contains two tasks. The first task removes the audio selector panel from the flight compartment. The second task installs the audio selector panel to the flight compartment.
 TASK 23-51-01-004-001
 2.  Remove Audio Selector Panel
___________________________
 A.  General
 (1)  This task gives the instructions to remove the audio selector panel from the flight compartment.
 B.  References
 (1)  AMM 20-41-01/201, Electrostatic Sensitive Discharge Devices -Maintenance Practices
 C.  Access
 (1)  Location Zones
 211/212 Flight Compartment

 D.  Procedure
　
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