via Instagram http://ift.tt/1W7qKKC This knob on the Airbus A320 FCU (flight control unit) switches the altimeter setting from standard (1013.25 hPa) to QNH and back. A ring around its base lets the pilot switch between altimeter settings in hPa and inHg (inches of mercury, used in the USA). #aviation #avgeek #airbus #airbuslovers #a320 #airbus320 #a319 #a321 #altimeter #fcu #flying #cockpit #flightdeck #pilot #pilotseye #pilotsview #pilotslife #crewlife #flying #airplane #airline #airliner #jet #flight #knob #panel
