OPERATIONS MANUAL

Communications
ACP: (continued)
Push-to-talk (PTT) switch
Switch is spring loaded to center position.
When out of center, CALL light of selected
transmitter is reset if it was illuminated,
and transmission is in progress with this
ACP user’s microphone.
R/T Transmits on selected transmitter
(transmits on FLT when FLT
transmitter is selected).
INT Transmits on FLT interphone
system only, regardless whether
FLT transmitter is selected or not.
Speaker selector & volume control
Operative only when associated with the
captain’s or first officer’s speaker; there is
no dedicated speaker for the observer.
Push (momentary action) Activates or
mutes monitoring on this ACP
user’s interphone speaker.
Rotate Adjusts speaker volume.
GREEN
LIGHT
Speaker monitoring is active.
Navaid audio filter selector
V (voice) Only voice and marker
beacons are audible.
B (both) All are audible.
R (range) Only Morse code and marker
beacons are audible.
VOR/ADF audio
source selector
Selects VOR L,
VOR R, ADF L, or
ADF R for monitoring
of voice broadcast
or Morse code.
Approach audio
source selector
Selects ILS L, C,
or R for Morse
code monitoring,
or MKR for
marker beacon
tones.
Receiver selector & volume control (VOR/ADF, APP)
Push (momentary action) Activates or mutes
monitoring of selected navaid audio source.
Rotate Adjusts monitor volume.
Monitoring is active.
GREEN
LIGHT
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