EFOS | User’s manual
11
5.3 PHYSICAL BUTTONS
The EFOS also contains physical push buttons (keys) and
rotary switches (knobs) to control various aspects of the flight
instrument system. The rotary switches have three functions
depending on whether the user rotates the knob (1), pushes it
(2) or push-holds whilst rotating (3).
• NAV key: Transfers the standby and active NAV
frequencies.
• COM key: Transfers the standby and active COM
frequencies. Pressing and holding this key for two
seconds automatically tunes the emergency frequency
(121.5 MHz) in the active frequency field.
• NAV knob: (1) Sets the kHz of the active NAV frequency. (2)
Transfers the active NAV source to the standby frequency
of the same NAV source. (3) Sets the MHz of the active
NAV frequency.
• HDG | IAS knob: (1) Sets the Heading Bug position in the
HSI. (2) Syncs the Heading Bug to the current heading. (3)
Increases/decreases the IAS to hold.
• ALT knob: (1) Sets the Altitude Bug in the altimeter.
(2) Syncs the Altitude Bug to the current altitude. (3)
Increases/decreases the Altitude Bug in the altimete in
steps of 1000s ft.
• COM knob: (1) Sets the kHz of the active COM frequency.
(2) Transfers the active COM source to the standby
frequency of the same COM source. (3) Sets the MHz of
the active COM frequency.
• CRS | BARO knob: (1) Sets the course. (2) Returns the
course pointer to the bearing of the active waypoint
or navigation station. (3) Sets the altimeter barometic
pressure.
