DOO435
FLIGHT
INTERPHONE

S00426
FIGHT DECK
CALL SW

119BL
MAIN EQUIPMENT CENTER
NOSE GEAR INTERPHONE PANEL, P62 G
F
Flight Interphone System - Component Location
Figure 102 (Sheet 3)

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A

757 MAINTENANCE MANUAL
 FLIGHT INTERPHONE SYSTEM - ADJUSTMENT/TEST
__________________________________________
 TASK 23-51-00-735-001
 1.  System Test - Flight Interphone System______________________________________
 A. General
 (1)  This procedure contains a task that gives the system test for the flight interphone system. This task makes sure that the flight interphone system operates correctly and is ready for use.
 B. References
 (1)  24-22-00/201, Electrical Power - Control
 C. Access
 (1)  Location Zones
 (a)  
211/212 Flight Compartment - sect 41

 (b)  
711 Nose Landing Gear (NLG)

 D. Prepare for Test
 S 865-002
 (1)  
Supply electrical power (Ref 24-22-00).

 S 865-003

 (2)  
Make sure that these circuit breakers on the overhead panel, P11, are closed:

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

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

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

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

 (e)  
Turn the volume control knob on the captain's and the first officer's flight interphone speaker counterclockwise to off.

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A
757 MAINTENANCE MANUAL
 (f)  Set the Audio Selector Panel (ASP) at each flight crew station to these conditions: 1) BOOM/OXY switch or BOOM/MASK switch to the BOOM position. 2) all the volume controls off except INT which should be on
 with the volume at mid point.
 E. Audio Selector Panel and Jack Panel Test
 S 735-006
 (1)  Do the test that follows:
 (a)  
Push the INT MIC SELECTOR switch on the ASP at each flight crew station.

 (b)  
Make sure that the light in the switch comes on.

 (c)  
Use the boom microphones, headphones, and either the audio selector panel PTT switch or RT/INT switch (supernumerary) to make a voice communication between the captain and the first officer stations.

 (d)  
Make sure you hear clear audio.

 (e)  
Use the boom microphones, headphones and the control wheel PTT switches to make a voice communication between the captain and the first officer stations.

 (f)  
Make sure you hear clear audio.

 (g)  
Use the boom microphones, headphones and either the PTT switch on the audio selector panels or the RT/INT switch (supernumerary) to make a voice communication between the captain and the first observer stations.

 (h)  
Make sure you hear clear audio.

 (i)  
GUN 051; Use the boom microphones, headphones and either the PTT switch on the audio selector panels or the RT/INT switch to make a voice communication between the captain and the supernumerary stations.

 (j)  
GUN 051;
 Make sure you hear clear audio.

 (k)  
GUN 051; Use the boom microphones, headphones, the captain's control wheel PTT switch and the supernumerary's RT/INT switch on the P8 control stand to make a voice communication between the captain and the supernumerary stations.

 (l)  
GUN 051;
 Make sure you hear clear audio.

 (m)  
Use the hand microphones and the headphones to make a voice communication between the captain and the first officer stations.
　
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