OPERATIONS MANUAL

Communications
RTP:
Active and standby frequency indicators
Display the active and the preselected
standby frequency of the selected radio. The
word DATA appears when 137.0 is set on
VHF C and ACARS is operational. When
the HF SENS selector is rotated while an
HF radio is selected, the standby indicator
displays SEN and the selected sensitivity for
2 seconds. The indicators are blank when the
RTP is off. If a radio is selected that has been
locked out by maintenance, each indicator
displays INOP. When the RTP fails, PANEL
FAIL is displayed across both indicators.
Offside tuning light
Normally, the three RTPs should
operate as follows:
• RTP L tunes VHF L and HF L
• RTP R tunes VHF R and HF R
• RTP C tunes VHF C
When an offside radio is selected,
the light illuminates on this RTP
and on that RTP on which this radio
is normally selected. For example,
when RTP L selects VHF C, the light
illuminates on RTP L and on RTP C.
(Light is inoperative on inactive RTPs).
Panel off switch
Push (momentary action)
Alternately switches the RTP
on and off. For the off-function
the switch must be pressed for
2 seconds.
Frequency selectors
Rotate The inner knob selects the
two rightmost digits on HF
frequencies, and the three
rightmost digits on VHF
frequencies. The outer knob
selects the other digits.
Frequency transfer switch
Push (momentary action) Swaps the standby
with the active frequency and tunes the
selected radio to the new active frequency.
Transfer is inhibited for 1 second after last
transfer, or for 3 seconds when DATA has
been swapped.
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