User's Guide ______________________________________________________________________
278 _________________________________________________________________ M211296EN-A
QFE/QFF Pressure
The reduced air pressure QFE (pressure at a certain level) or QFF
(pressure at sea level) are calculated as follows:
1
T
L
A
ePQF 
where
T
1
= 7996 + 0.0086 * L + 29.33 * T
A
L = Reduction level in meters
T
A
=
Air temperature [ï‚°C]
P
A
= Atmospheric pressure [hPa]
QF = Reduced pressure (QFE or QFF) [hPa]
Table 114 Inputs for QFE/QFF Pressure Calculation
Input Variable
Air temperature (T
A
) TAAVG1M; see Table 4 on page 22
Atmospheric pressure (P
A
) OFE PAAVG1M; see Table 5 on page 23
Atmospheric pressure (P
A
) QFF QFEAVG1M; see Table 5 on page 23
Reduction level (L) QFE Station parameter 'pslevel'
Reduction level (L) QFF Station parameter 'altitude'
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