Audio Panel

T-34C AIRCRAFT SYSTEMS FAMILIARIZATION

CHAPTER ELEVEN

WORKBOOK

Figure 11-7 Annunciator/Control Panel

Audio Panel

The audio panel has an amplifier located beneath the panel face. It amplifies the audio from the

ICS and the UHF, TACAN, and VOR receivers. The amplifier is energized immediately when

DC power is applied to the aircraft. Power to the amplifier is not affected by the AVIONICS

MASTER switch or the avionics control transfer system. Audio switches (sometimes called

"mixer switches"), located in the center of the audio panel, enable either normal or emergency

reception. When forward (ON) in the UHF, TACAN, and VOR position, audio from each radio is

amplified and sent to the respective headset. The center OFF position allows no audio to the

headset. The aft EMER AUDIO position is used only if the audio panel amplifier fails, in which

case the amplifier is bypassed. The resulting loss of volume can be compensated for by adjusting

the VOL knobs on the individual UHF, TACAN, and VOR control panels. The VOL knob on the

audio panel adjusts the volume of the amplified ICS, UHF, TACAN, and VOR audio. The VOL

knob is the only control for the individual pilot's ICS volume. Imbalance between ICS and the

UHF, TACAN, and VOR audio can be corrected by adjusting the VOL knobs on the individual

control panels (Figure 11-1).

Course Deviation Indicator (IND-350)

The course deviation indicator (CDI), located on the right side of the instrument panel in both

cockpits, is a secondary navigational instrument in the VOR/TACAN system. It assists the pilot

in interpreting the RMI and in maintaining a desired flight course. The OBS knob sets the

selected course. The CDI (deviation bar) indicates deviation from course. The TO-FROM

AVIONICS

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