Piper ARCHER III Pilot Operating Handbook page 229

PA-28-181, A RCHER ill
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Autopilot (Optional) (continued)
A UTOPILOT FEATURES (continued)
Expanded Engagement Envelope (Optional)
Expanded engagement envelope allows autopilot engagement up to the pitch
and roll attitudes shown in the autopilot limitations of Section 2. If the autopilot
is engaged at a pitch or roll attitude within the expanded engagement envelope
but beyond the maximum autopilot command limits, the airplane will be pitched
or rolled to the maximum autopilot command limits.
Audio Panel
The audio panel contains traditional transm.itter and receiver selectors, as well
as an integral intercom and marker beacon system. The marker beacon lights
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appear on the PFD and the marker beacon audio can be heard over the headsets
or cockpit speaker. In addition, a clearance recorder records the last 2½ minutes
of received audio. Lights above the audio panel selection buttons indicate
which selections are active. If a failure of COMJ and COM2 occurs, a fail-safe
communications path is available between the pilot's headset/microphone and
COM I. The fail-safe communications path is activated by pulling the AUDIO
MKR circuit breaker located on the circuit breaker panel.
The PILOT knob located towards the bottom of the audio panel allows switchjng
between volume and squelch control as indicated by illumination of VOL or SQ.
Turn the knob to adjust intercom volume or squelch. The MAN SQ key must be
selected to allow squelch adjustment.
The red DISPLAY BACKUP button at the bottom of the audio panel allows
manual selection of the reversionary display mode .
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ISSUED: December 22, 2017
DESCRIPTION & OPERATION
REPORT: VB-2749
SECTION 7
7-43