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23-51-00
ALL ú ú 08 Page 10 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
(4)
AIRPLANES WITHOUT DIGITAL AUDIO CONTROL SYSTEM; The Audio Accessory Unit (AAU) collects and distributes the various system signals from the radio and navigation systems. The information is sent to the specific ASP of the crewmember that requested the information. PA, both the service and flight interphone systems send and receive signals through the AAU.
(5)
AIRPLANES WITH DIGITAL AUDIO CONTROL SYSTEM; The REU accepts boom microphone, oxygen mask microphone, and handheld microphone inputs, and provides output to the flight compartment headphones and speakers. The REU contains service interphone, flight interphone and speaker amplifiers to provide the necessary audio amplification between stations. The REU routes ground proximity warnings and internally generated altitude alert tones to the speakers.
(6)
Any audio selected on the ASP will be recorded on the voice recorder for each crew member. In the event of a loss of REU power, an ALT/NORM relay de-energizes thus providing back-up VHF communications.
NOTE:____HOT MIC cockpit voice recording is used. With HOT MIC recording, audio is recorded on the cockpit voice recorder from boom or oxygen mask microphones, whichever is selected at each crewmember's station, regardless of the position of their PTT switches or MIC SELECTOR switches.
Radio Inputs
(1)
Audio inputs are provided from each of the communication radio
receivers and from each of the navigation radio receivers.Microphone Inputs
(1)
An input is wired from each flight crewmember's boom, mask or hand microphone to the remote electronics/audio accessory unit. Additional inputs are connected from the service interphone system, and from the external power panel.
Audio Outputs
(1)
Audio outputs from the remote electronics/audio accessory unit are provided to each flight crew station and to the external power panel. One output is for the boom microphone/headsets and one output is for the headphone jacks.
(2)
Two audio outputs are used to drive the pilot's overhead speakers.
(3)
Amplifiers in the remote electronics/audio accessory unit provide the drive for the audio outputs. There are two audio amplifiers in the remote electronics/audio accessory unit: one used with the flight interphone and one used with the service interphone. External volume control adjustments are installed for each of the amplifiers.
Synthesized Audio
(1)
A voice synthesizer will provide the altitude alert audio messages when so inputted by the altitude alert system.
(2)
A two wire input is provided to receive the audio warning tone from the ground proximity warning system.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
23-51-00
ALL ú ú 08 Page 11 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F.
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A
737-300/400/500MAINTENANCE MANUAL
Microphone Selection (Normal Mode)
(1)
Selection of which system will receive the microphone input from each flight crew station is made at the audio selector panel. The last MIC SELECTOR pushbutton which is pushed will determine the communication system to be keyed by a PTT switch at that flight crew station.
(2)
Flight crewmembers access the flight interphone system to communicate with each other by setting the PTT switch on the ASP to INT or I/C position. The PTT function can also be performed at either pilot's station by setting the control wheel PTT switch to the INT position.
(3)
Flight crewmembers key a selected airplane radio system from an audio selector panel by pushing and rotating the system audio control and pushing the system MIC SELECTOR switch and then holding the R/T-I/C or RADIO - INT switch to the R/T or RADIO position. This connects the boom or oxygen mask microphone and a control line to the selected radio system. The PTT function can also be completed at either pilot's station by holding the control wheel PTT switch to the MIC position.
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