Aviation Q-Codes

• QDM - Magnetic heading TO a station (Magnetic to the station).
• QDR - Magnetic bearing FROM a station (Magnetic from the station).
• QTE - True bearing FROM a station (True from the station).
• QUJ - True heading TO a station (True to the station).
• QFU - Magnetic orientation of runway.
• QFE - The observed pressure at a specified datum (usually aerodrome or runway threshold elevation) corrected for temperature.
• QNH - The altimeter sub-scale setting to obtain elevation when on the ground. QNH equals QFE reduced to mean sea level (MSL) pressure using the standard atmosphere lapse rate.

ICAO Doc 8400

RT. Radio Telephony

QFE. Atmospheric pressure at aerodrome elevation (or at runway threshold)

QNH. QFE reduced to MSL using the assumed conditions of standard atmosphere. Altimeter sub-scale setting to obtain elevation when on the ground

• From the available options, the only code expressing pressures are QNH and QFE.