(n)  
Make sure you hear clear audio.

 (o)  
Make sure the INT volume control on the audio selector panels changes the volume level smoothly.

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

 (q)  
Make sure you hear clear audio.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 (r)  
GUN 051; Use the hand microphones and the headphones to make a voice communication between the captain and the supernumerary stations.

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

 (t)  
Set each audio selector panel BOOM/OXY or BOOM/MASK switch to the oxygen mask position.

 (u)  
Use the hand microphones and the headphones to make a voice communication between each crew station.

 (v)  
Make sure you hear clear audio.

 (w)  
Set all of the BOOM/OXY or BOOM/MASK switches back to the BOOM position.

 F. Cockpit Speaker Test.
 S 735-007
 (1)  Do the test that follows:
 (a)  
Set the volume control knob on the captain's cockpit speaker to the middle position.

 (b)  
Make a flight interphone voice transmission from the first observer station.

 (c)  
Make sure you hear clear audio through the captain's cockpit speaker.

 (d)  
Make sure the audio selector panel, control wheel MIC, and hand mic PTT switches at the captain's station will mute the captain's speaker.

 (e)  
Set the BOOM/OXY switch or the BOOM/MASK switch on the captain's and the first officer's audio selector panels to the oxygen mask position.

 (f)  
Make sure that the hand mic PTT switches at each station will mute the captain's speaker.

 (g)  
Set the BOOM/OXY switch back to the BOOM position.

 (h)  
Set the volume control knob on the captain's cockpit speaker to off.

 (i)  
Make sure the speaker is off.

 (j)  
Set the volume control knob on the first officer's cockpit speaker to the middle position.

 (k)  
Make a flight interphone voice transmission from the first observer station.

 (l)  
Make sure you hear clear audio through the first officer's cockpit speaker.

 (m)  
Make sure the audio selector panel, control wheel MIC, and hand mic PTT switches at the first officer's station will mute the first officer's speaker.

 (n)  
Set the BOOM/OXY switch on the captain's and the first officer's audio selector panels to the OXY position.

 (o)  
Make sure the hand mic PTT switches at the first officer's station will mute the first officer's speaker.

 (p)  
Set the volume control knob on the first officer's cockpit speaker to off.

 (q)  
Make sure the speaker is off.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 23-51-00
 ALL  ú ú 14 Page 503 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 G.  Oxygen Mask Microphone Test
 S 735-008
 (1)  Do the test that follows:
 (a)  
Set the BOOM/OXY or BOOM/MASK switch on the ASP at each flight crew station to the oxygen mask position.

 (b)  
Use the captain's and the first officer's oxygen mask microphones and headphones to make a voice communication between their stations.

 (c)  
Make sure you hear clear audio through the headphones.

 (d)  
Use the captain's and the first observer's oxygen mask microphones and headphones to make a voice communication between their stations.

 (e)  
Make sure you hear clear audio through the headphones.

 (f)  
GUN 051; Use the captain's and the supernumerary oxygen mask microphones and headphones to make a voice communication between their stations.
　
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