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of the COM, while the line below will display the preset frequency.
When pressing the line select key (preset frequency) adjacent to the
lower frequency, a yellow cursor encloses that frequency. This step is
not always necessary since the cursor normally “parks” over the preset
frequency box. Anytime the cursor has been moved to another area on
the main radio tuning page, it will automatically return to the COM
preset frequency after twenty seconds of inactivity on that page. When
the yellow cursor is enclosing the preset frequency, that frequency can
be changed by adjusting the tuning knobs. The preset frequency can
then be changed (flip-flopped) with the active frequency by depressing
the transfer key.
The storage function can be accomplished by pressing the STO (store)
key located at the bottom of the RMU. When the STO key is depressed,
the nomenclature below the preset COM frequency will change back to
MEMORY, and the digit following MEMORY will indicate in which
memory location the frequency is stored. With the main tuning page
displayed, the rotary tuning knob can be used to scroll through the frequencies
stored in memory. As each memory location (channel) is selected,
the stored frequency will be shown on the COM preset line
which can then be moved to the active position by depressing the transfer
key.
Pilot’s Manual
5-54 PM-126A
A TX will appear at the top of the COM window when the associated
radio is transmitting. Its purpose is to show that the transmitter is on
and to alert the pilot in case of a stuck microphone key. If not attended
to for approximately two minutes, a beep will sound on the audio and
a MIC STK annunciation will appear at the top of the COM window
until the mic button is released. Ten seconds after the MIC STK
annunciation appears, the selected transmitter will automatically turn
off. Depressing the SQ (squelch) function button at the bottom of the
RMU causes the COM radio to open its squelch and allows any noise
or signal present in the receiver to be heard. When selected, an SQ will
appear at the top of the COM window. Pressing the button a second
time closes the squelch.
FMS TUNING
The FMS interfaces with the RMUs for radio tuning. The FMS has a radio
tuning page that can be used to control VHF COM, NAV, ADF and
transponder codes. If it is suspected that the FMS is interfering with
com/nav radio tuning, an FMS ENABLE/DISABLE selection on the
RMU NAV memory page can be toggled with the adjacent line select
key. The DISABLE selection will prevent tuning any of the radios
through the FMS CDU.
NAV TUNING
The format of the NAV window (top right corner of the RMU) is identical
to the COM window in that the top frequency is active and the bottom
frequency is the preset frequency. Pressing the line select key
alongside the NAV preselect window moves the cursor to that window.
This connects the tuning knobs to the NAV preset frequency. By pressing
the NAV transfer key (top right) the preset and active frequencies
are exchanged. The preset frequency may be changed to a different frequency
by using the tuning knobs or by pressing the line select key to
bring up the next frequency from memory. Selection of stored frequencies
can be accomplished by pressing the line select key by the NAV
preset window until the tuning box encloses the memory mnemonic.
Rotating the tuning knob scrolls through the stored frequencies displaying
them in the preset area.
Pilot’s Manual
PM-126A 5-55
The memory functions and direct tuning operate the same as described
under COM operation, except the NAV window has an added function
called DME split tuning mode. Its operation is similar to the function
called DME hold. Depressing the DME function key on the RMU allows
the DME frequency to be tuned independent of the NAV frequency.
Depressing the DME once causes the NAV window to split into two
sections, the top one being the active VOR frequency and the lower one,
now labeled “DME”, containing the active DME frequency in VHF format.
In this condition, the DME may be tuned directly by simply pressing
the line select key to place the cursor box around the frequency and
retuning using the tuning knobs. The DME digital station identifier will
appear adjacent to the DME nomenclature on the top edge of the DME
window. An amber H (hold) appears in the lower DME window. This
indicates that the distance display (DME or TACAN) is not paired with
the VOR/ILS navigation data. When the H is displayed on the RMU, it
will also be displayed following the DME read-out on the PFD.
ADF TUNING
　
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