Frequency Displays Windows

• ACTIVE - Shows the active frequency of the selected radio (which is identified by the illuminated radio selection key).
• STBY/CRS - Displays the NAV course or standby radio frequency. This frequency is activated by pushing the transfer switch, and is changed by rotating the frequency selector knobs.

Transfer Switch (Arrow)
When pushed, exchanges the active and standby frequencies, and tunes the new active frequency.

Radio Selection Switches (VHF, HF & AM)
When pushed, the ACTIVE window displays the tuned frequency and the STBY/CRS window displays the Standby frequency.

SEL Indicator
Illuminates on both RMPs when a transceiver normally associated with an RMP is tuned by another RMP.

Frequency Selector Knobs

• Selects the course or standby radio frequency. Displayed in STBY/CRS window.
• Inner knob controls decimal values.

NAV Switch (Guarded)

• When pressed on RMP 1 or 2, the radio navigation back-up mode engages.
• Removes auto-tuning from the FMGC and the VOC, ILS and ADF receivers are controlled by the RMP.
• The switch illuminates green when pushed.
• Pushing switch a second time returns control to the FMGC.

STBY NAV Selection Switches (VOR, ILS, MLS & ADF)

• When the NAV switch is selected, enables tuning of the selected navaid via the frequency selector knobs.
• Each RMP tunes its respective VOR.
• Tuning an ILS on either RMP tunes both ILS receivers, if both RMPs are in the standby NAV mode.
• The ADF can only be tuned on RMP 1.

BFO Switch
When selected, the Beat Frequency Oscillator mode becomes active, provided the ADF receiver is selected.

ON/OFF Switch
Controls the power supply to the Radio Management.