The marker mute and marker aural on/off/volume control are located on the bottom row of switches
on the panel. The marker mute is used to temporarily silence the marker beacon audio. Momentarily
pressing the MUTE button will mute the beacon signal as long as it remains above a minimum
threshold level. When it drops below that level, a time-out sequence will begin, which will mute it for
a fixed period of time. The MKR button may be pressed in to disable the aural signal. When the
button is out (pressed again) the marker beacon volume can be controlled with the knob, however,
maximum counterclockwise rotation will not totally turn down the volume since a minimum signal is
automatically retained in order not to miss the aural marker signal if it has been selected on.
COCKPIT VOICE RECORDER
The L3 FA2100 cockpit voice recorder system provides a continuous recording of the last 30 minutes
of all voice communications and aural warnings originating in the cockpit, as well as sounds from
warning horns and bells. The system is protected by a 5-ampere circuit breaker located on the left
circuit breaker panel in the cockpit.
The sensitive cockpit microphone is located to the left of the fire tray. The recorder is energized any
time the battery switch is in the BATT position. The control panel, located low on the right side of the
copilot’s instrument panel, contains a TEST button and an ERASE button. System operation is
checked by pressing the TEST button. When the TEST button is held down for five seconds,
illumination of the green light on the control panel indicates correct functioning of the voice recorder
system. To erase the cockpit voice recorder the airplane must be on the ground with the landing gear
squat switch compressed and the cabin door open. Pressing the ERASE button for approximately 2
seconds will cause the entire recording to be erased.
The installation is equipped with a five-G switch which will activate any time the airplane is subjected
to a five-G force; this will disable the system’s erasure mechanism until a reset button on the G-
switch is pressed. The switch is located in the tailcone.
COCKPIT VOICE RECORDER
Figure 3-13
Cessna Citation XLS - Instrumentation & Avionics
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