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YA626 - YK104 The ACP transmitter selectors are not functional. Any transmission from that station must be from the radio shown on the chart below. The transmitter selector for the usable radio illuminates when a station is operating in the degraded mode. The receiver switches are not functional, and only the usable radio is heard at a preset volume, through the headset. The speaker and speaker switch are not functional at that station. In addition, the flight interphone and service interphone cannot be used. The control wheel PTT switch INT position and the ACP PTT switch I/C position are not functional since the flight interphone is not functional.
YA613 The ACP transmitter selectors are not functional. Any transmission from that station must be from the radio shown on the chart below. The transmitter selector for the usable radio illuminates when a station is operating in the degraded mode. The receiver switches are not functional, and only the usable radio is heard at a preset volume, through the headset. The speaker and speaker switch are not functional at that station. In addition, the flight interphone and service interphone cannot be used. The control wheel PTT switch INT position and the ACP PTT switch INT position are not functional since the flight interphone is not functional.
YA626, YA721 - YK104 The mask and boom microphones can be used for transmission on the usable radio. The MASK–BOOM switch works normally in the degraded mode. The mask and boom microphones can be keyed with the control wheel PTT switch MIC position or the ACP PTT switch R/T position. The hand microphone is not usable in the degraded mode of operation.
YA613 The mask and boom microphones can be used for transmission on the usable radio. The mask and boom microphones can be keyed with the control wheel PTT switch in the MIC position or the ACP PTT switch in the RADIO position. The hand microphone is not usable in the degraded mode of operation.
YA686, YA687 The mask and boom microphones can be used for transmission on the usable radio. The mask and boom microphones can be keyed with the control wheel PTT switch MIC position or the ACP PTT switch R/T position. The hand microphone is not usable in the degraded mode of operation.
Copyright . The Boeing Company. See title page for details.
Communications -System Description

737 Flight Crew Operations Manual
Audio warnings for altitude alert, GPWS, and windshear are not heard on an audio system operating in the degraded mode.
An audio system operating in the degraded mode cannot access the passenger address system through the audio control panel. The crewmember can still use the service interphone handset and PA microphone if they are installed on the control stand.
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 

Flight Interphone System
The flight interphone system is an independent communication network. Its primary purpose is to provide private communication between flight deck crewmembers without intrusion from the service interphone system. The ground crew may also use the flight interphone through a jack at the external power receptacle.
YA613 - YA809, YC411, YC413 The pilots can transmit directly over the flight interphone by using the control wheel PTT switch. Alternately, any crewmember with an ACP can transmit/receive over the flight interphone by using their related ACP and normal PTT switches. Any standard microphone may be used with the flight interphone system.
YC153, YC154, YD651 - YK104 The pilots can transmit directly over the flight interphone by using the control wheel or glareshield PTT switches. Alternately, any crewmember with an ACP can transmit/receive over the flight interphone by using their related ACP and normal PTT switches. Any standard microphone may be used with the flight interphone system.
Service (Attendant) Interphone System
The service interphone system provides intercommunication between the flight deck, Flight Attendants, and ground personnel. Flight deck crewmembers communicate using either a separate handset (if installed) or their related ACP and any standard microphone.
Copyright . The Boeing Company. See title page for details.
5.20.4  June 1, 2005

Communications -System Description

737 Flight Crew Operations Manual
The Flight Attendants communicate between flight attendant stations or with the flight deck using any of the attendant handsets. Anyone who picks up a handset/microphone is automatically connected to the system.
External jacks for use by maintenance or service personnel can be added to the system by use of the service interphone switch.
Passenger Address System
The passenger address (PA) system allows flight deck crewmembers and flight attendants to make announcements to the passengers. Announcements are heard through speakers located in the cabin and in the lavatories.
　
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