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transmission over flight interphone and bypasses transmitter selector.
? MASK-BOOM Switch
MASK – Selects oxygen mask for transmissions.
BOOM – Selects boom microphone for transmissions.
@ Filter Switch
V (Voice) – Receive NAV and ADF voice audio.
B (Both) – Receive NAV and ADF voice and range audio.
R (Range) – Receive NAV and ADF station identifier range (code) audio.
>@BCD Normal Audio System Mode
The Captain, First Officer, and Observer audio systems are located in a common
Remote Electronics Unit in the E & E compartment. They function
independently and have separate circuit breakers. The audio systems are
normally controlled by the respective Audio Selector Panels through digital or
computerized control circuits.
COMMUNICATIONS
737 Sec. 6.5 Page 5
Flight Manual Continental Rev. 11/15/02 #41
>@BCD Degraded Audio System Mode
If electrical power is lost to an audio system, the ASP cannot control the Remote
Electronics Unit and the audio system reverts to the degraded mode. Aircraft
with an ALT/NORM switch can manually be placed in the degraded mode by
placing the switch to ALT. In this mode, the Audio Selector Panel at that station
is inoperative and the crewmember can only communicate on one radio.
The ASP transmitter selectors are not functional and any transmission from that
station is on the radio shown on the chart below. The transmitter selector for
the useable radio will illuminate when a station is in degraded mode. The
receiver switches are not functional, and the only useable radio is heard at a
preset volume, through the headset. The speaker and speaker switch are not
functional at that station.
The mask and boom microphones can be used for transmission on the useable
radio. The MASK-BOOM switch works normally in the degraded mode. The mask
and boom microphones can be keyed with the control wheel push-to-talk switch
MIC position or ASP push-to-talk switch R/T position. The hand microphone is
not useable in the degraded mode.
The flight interphone and service interphone cannot be used on an audio system
in degraded mode. The control wheel push-to-talk switch INT position and ASP
push-to-talk switch I/C position are not functional since the flight interphone is
not functional.
Audio warnings for altitude alert, the ground proximity warning system, and
windshear are heard on an audio system in degraded mode.
In the degraded mode, the passenger address system cannot be accessed through
the Audio Selector Panel.
If an audio system is in degraded mode, the crewmember can still use the
service interphone handset and PA microphone, if they are installed on the
control stand.
DEGRADED AUDIO SYSTEM OPERATION
CREW STATION AUDIO SYSTEM
IN DEGRADED MODE
RADIO AVAILABLE FOR TRANSMISSION
AND RECEPTION AT DEGRADED STATION
CAPTAIN VHF-1
FIRST OFFICER VHF-2
OBSERVER VHF-1
COMMUNICATIONS
Sec. 6.5 Page 6 737
Rev. 11/15/02 #41 Continental Flight Manual
>@BCD Audio Selector Panel (ASP)
< Transmitter Selector (MIC SELECTOR) Switches
Illuminated – Related switch is active.
Push –
· Selects related communication system for subsequent transmission
· Only one switch may be selected at a time; pushing a second switch
deselects first switch
· Reception possible over selected system regardless of whether related
receiver switch is on.
= Receiver Switches
Illuminated (white) – Related switch is active.
Rotate – Adjusts volume.
Push –
· Allows reception of related communication system or navigation
receiver
· Multiple switches may be selected.
Push again – Deselects related system or receiver.
COMMUNICATIONS
737 Sec. 6.5 Page 7
Flight Manual Continental Rev. 11/15/02 #41
> Push-To-Talk Switch (spring-loaded to neutral position)
R/T (Radio-Transmit) – Keys oxygen mask or boom microphone for
transmission as selected by transmitter selector.
I/C (Intercom) – Keys oxygen mask or boom microphone for direct
transmission over flight interphone and bypasses transmitter selector.
? MASK-BOOM Switch
MASK – Selects oxygen mask microphone for transmissions.
BOOM – Selects boom microphone for transmissions.
@ Speaker (SPKR) Switch
Illuminated (white) – SPKR switch is active.
Push – Audio from selected receiver is heard on overhead speaker.
Rotate – Adjust overhead speaker volume.
Push again – Deselects audio from selected receiver to be heard on
overhead speaker.
A Alternate – Normal (ALT-NORM) Switch
　
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