一次搞清楚 Q-code and Altitudes (Altimetry)

March 4, 2024

Ref Ace the technical pilot interview 2/E

QFE : refer to the height (vertical distance) above ground level (with no relation to mean sea level)

QNH : Altitude – refer to the height (vertical distance) above mean sea level

QNE : Pressure Height = Flight level – refer to the height (vertical distance) above 1013 (ISA) datum.

QFF : is the pressure level at detecting point (usually airport weather office) reduce to MSL, it considers the actual environment condition and calculation applied.

On value and using of TAWS/FMS alert data in examination of air accidents, the case of Warsaw-Smolensk flight on 10 April 2010 | The Aeronautical Journal | Cambridge Core

 

Hight refers to the vertical distance above ground/surface;

Altitude refers to the vertical distance above MSL;

Elevation refers to the vertical distance between a fixed point (say the airport) and MSL

 

5 Types of altitude (relationship with Q-code)

  1. Indicated altitude: altimeter reading
  2. Absolute altitude: above ground/surface (QFE)
  3. True altitude: above mean sea level (QNH)
  4. Pressure altitude: above the standard datum plane (SDP) – 1013 hPa or 29.92 mmHg (QNE)
  5. Density altitude: pressure altitude corrected for non-standard temperature (ISA deviation)
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