CESSNA
SECTION
7
MODEL 152
AIRPLANE & SYSTEMS
DESCRIPTIONS
1 July 1978
7-32
AVIIONICS SUPPORT EQUIPMENT
If the airplane is equipped with avionics, various avionics support equipment may also be
installed. Equipment available includes two types of audio control panes, microphone/headset
installations and control surface static dischargers. The following paragraphs discuss these
items. Description and operation of radio equipment is covered in Section 9 of this handbook.
AUDIO CONTROL PANEL
If an audio control panel (see figure 7- 10) is installed in the airplane, it will be one of two
types, either with or without marker beacon controls. The features of both audio control panels
are similar and are discussed in the following paragraphs.
TRANSMITTER SELECTOR SWITCH
When more than one NAV/ COM radio is installed in the airplane, it is necessary to select the
radio unit the pilot desires to use for transmitting. To accomplish this, a transmitter selector
switch is provided on the audio control panel. The switch is either a two-position toggle-type or
a three-position rotary-type depending on which audio control panel is installed. Both switches
are labeled with numbers which correspond to the top (number 1) or the bottom (number 2)
NAV/COM radio. Position 3 is not used in this airplane.
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 amplifier failure is loss of the selected transmitter. This can be verified by
switching to the speaker function.
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