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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(91)

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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The stall warning system should be checked during the preflight inspection by placing a clean handkerchief over the vent opening and applying suction. A sound from the warning horn will confirm that the system is operative.
 
AVIONICS SUPPORT EQUIPMENT
The airplane may, at the owner's discretion, be equipped with various types of avionics support equipment such as an audio control panel, microphone-headset, and static dischargers. The following paragraphs discuss these items.
AUDIO CONTROL PANEL
Operation of radio equipment is covered in Section 9 of this handbook. When one or more radios are installed, a transmitter/ audio switching system is provided (see figure 7-10). The operation of this switching system is described in the following paragraphs.
TRANSMITTER SELECTOR SWITCH
A rotary type transmitter selector switch, labeled XMTR SEL, is provided to connect the microphone to the transmitter the pilot desires to use. To select a transmitter, rotate the switch to the number corresponding to that transmitter. The numbers 1, 2 and 3 above the switch correspond to the top, second and third transceivers in the avionics stack.
The audio amplifier in the NAV/ COM radio is required for speaker and transmitter operation. The amplifier is automatically selected, along with the transmitter, by the transmitter selector switch. As an example, if the number 1 transmitter is selected, the audio amplifier in the associated NAV / COM receiver is also selected, and functions as the amplifier for ALL speaker audio. In the event the audio amplifier in use fails, as evidenced by loss of all speaker audio and transmitting capability of the selected transmitter, select another transmitter. This should re-establish speaker audio and transmitter operation. Since headset audio is not affected by audio amplifier operation, the pilot should be aware that, while utilizing a headset, the only indication of audio arr plifier failure is loss of the selected transmitter. This can be verified by switching to the speaker function.
 
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