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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(93)

时间:2011-12-29 11:03来源:蓝天飞行翻译 作者:航空 点击:

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AUDIO SELECTOR SWITCHES
The audio selector switches, labeled NAV / COM 1, 2 and 3 and ADF 1 and 2, allow the pilot to initially pre-tune all NAV / COM and ADF 'receivers, and then individually select and listen to any receiver or combination of receivers. To listen to a specific receiver, first check that the AUTO selector switch is in the OFF (center) position, then place the audio selector switch corresponding to that receiver in either the SPEAK¬ER (up) or PHONE (down) position. To turn off the audio of the selected receiver, place that switch in the OFF (center) position. If desired, the audio selector switches can be positioned to permit the pilot to listen to one receiver on a headset while the passengers listen to another receiver on the Airplane speaker.
The ADF 1 and 2 switches may be used anytime ADF audio is desired. If the pilot wants only ADF audio, for station identification or other reasons, the AUTO selector switch (if in use) and all other audio selector switches should be in the OFF position. If simultaneous ADF and NAV / COM audio is acceptable to the pilot, no change in the existing switch positions is required. Place the ADF 1 or 2 switch in either the SPEAKER or PHONE position and adjust radio volume as desired.
NOTE
If the NAV / COM audio selector switch corresponding to the selected transmitter is in the PHONE position with the AUTO selector switch in the SPEAKER position, all audio selector switches placed in the PHONE position will automatically be connected to both the airplane speaker and any headsets in use.
MICROPHONE-HEADSET
The microphone-headset combination consists of the microphone and headset combined in a single unit and a microphone keying switch located
 
on the left side of the pilot's control wheel. The microphone-headset permits the pilot to conduct radio communications without interrupting other control operations to handle a hand-held microphone. Also, pas¬sengers need not listen to all communications. The microphone and headset jacks are located nearthe lower left corner of the instrument panel.
 
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