What does the Airbus A320 radio management panel do?
The Airbus A320 radio management panel (RMP) tunes and transfers communication-radio frequencies, chiefly the VHF sets and any fitted HF radios. It also provides backup tuning for navigation receivers if normal FMGC control is unavailable. It selects frequencies; the separate audio control panel determines which radio the crew hears or transmits on.
In Aviation & Real-World Flying terms, the RMP is the crew's frequency-management interface rather than the radio itself. Three RMPs are normally fitted: RMP 1 and RMP 2 on the centre pedestal, with RMP 3 on the overhead panel. Equipment and panel standards vary across the A320 family; our overview of the main A320 flight-deck controls shows how the pedestal panels fit together.
RMP controls and limits
An RMP can normally control any compatible communication transceiver, giving the crew redundancy if another panel becomes unavailable. Each panel is associated with a particular radio, but cross-selection allows one RMP to tune a radio normally managed from another position.
| RMP function | What it does | What it does not do |
|---|---|---|
| Radio selection | Selects VHF1, VHF2, VHF3 or a fitted HF set for tuning | Does not select the crew's transmit microphone or listening source |
| Frequency tuning | Enters a standby communication frequency | Does not make it active until it is transferred |
| Transfer | Swaps the active and standby frequencies | Does not change audio-panel settings |
| NAV backup | Provides direct tuning of applicable VOR, ILS or ADF receivers | Does not replace normal FMGC route and navigation management |
The SEL indication is often misunderstood. It can appear when an RMP is controlling a transceiver normally associated with another RMP; by itself, that does not mean the radio has failed.
The RMP does not set the transponder code, operate TCAS, control the autopilot or programme the flight plan. Those functions have separate controls.
How do you tune a VHF frequency on the A320 RMP?
VHF tuning is a select, tune, verify and transfer process.
- Power the panel. Confirm that the aircraft's electrical and avionics systems are powered and that the RMP is switched on.
- Select the required radio. Choose VHF1, VHF2 or VHF3 as appropriate. In many simulators, VHF1 corresponds to COM1 and VHF2 to COM2; VHF3 may be simplified or unavailable.
- Tune the standby frequency. Use the tuning controls to enter the complete frequency or channel shown in the standby window.
- Verify the entry. Check every digit against the ATC clearance, ATIS information or chart before activating it.
- Press transfer. The new frequency becomes active, while the previous active frequency moves to standby.
- Set the audio panel. Select the required transmitter and receiver monitoring on the audio control panel, then set a usable volume.
A mistake we see constantly in simulators is changing the standby frequency without pressing the transfer key. The display looks nearly right, but the aircraft remains on the old active channel.
Why can I tune the frequency but not hear ATC?
If the active frequency is correct but ATC remains silent, the audio control panel is the first place to check. The RMP manages tuning; the audio control panel manages transmitter selection, receiver monitoring and volume.
- Confirm the frequency is on the active side rather than standby.
- Select the corresponding VHF receiver for monitoring on the audio panel.
- Make sure the transmit selector is on the intended radio.
- Check headset, speaker and simulator radio-volume settings.
- If the simulator's built-in ATC expects COM1, verify that the add-on maps VHF1 to COM1.
Selecting VHF1 on the RMP only selects that set for frequency management. It does not automatically route microphone or receiver audio to the pilot.
Can the A320 RMP tune an ILS, VOR or ADF?
The RMP can tune applicable navigation receivers in its guarded backup NAV mode, but this is not the normal method of entering an ILS or VOR frequency. During ordinary operation, the FMGC manages automatic tuning, while manual entries are made through the MCDU's radio-navigation functions.
Backup NAV mode exists for a loss of normal FMGC tuning capability. Its exact receiver assignments depend on the aircraft standard, and some simulator add-ons model only part of it. After tuning, presentation of the raw navigation data is handled through the display controls; our explanation of how the A320 EFIS controls select navigation information covers that separate step.
Why is the A320 RMP not working in my simulator?
A non-responsive simulated RMP usually points to aircraft state, radio assignments or incomplete add-on modelling rather than an incorrect frequency.
- Blank display: check electrical power, avionics power and the panel's on/off control. A cold-and-dark aircraft will not have functioning radio panels until the relevant buses are powered.
- Desired channel is skipped: the radio may be using different 25 kHz or 8.33 kHz channel spacing. Displayed channel numbers do not include every arithmetically possible value.
- Frequency changes then snaps back: another RMP, a hardware controller or a duplicate simulator binding may also be commanding that radio.
- External panel controls the wrong set: generic hardware often sends COM1, COM2, NAV or ADF simulator events directly instead of operating the virtual RMP logic. This FSX radio-panel mapping example illustrates how those radio functions may be separated.
- NAV backup buttons do nothing: many simplified A320 panels implement ordinary COM tuning but omit cross-selection, HF operation or backup navigation tuning.
For simulator use, match the add-on's documentation rather than assuming every A320 panel reproduces the full aircraft logic. The real RMP architecture is redundant and interconnected; a basic virtual cockpit may expose little more than COM1 and COM2 active/standby controls.