HI folks, interesting thread. I got to pay attention to this as I have PEK twice this month. If its of any use that's what our OM says to that:
8.3.3.11. Temperature Correction
The calculated minimum safe altitudes/heights must be corrected when the OAT is
significantly lower than that predicted by the standard atmosphere.
The correction has to be applied on the height above the elevation of the altimeter setting
source. The altimeter setting source is generally the atmosphere pressure at an airport, and
the correction on the height above the airport has to be applied on the indicated altitude.
• Cold Temperature Altitude Corrections
With respect to altitude corrections the following procedures apply:
– IFR assigned altitudes may be either accepted or refused. Refusal in this case is
based upon the pilot’s assessment of temperature effect on obstacle clearance.
– When altitude corrections are applied to any published procedure altitude, pilots shall
advise ATC how much of a correction is to be applied.
(Canada only: Radar vectoring altitudes assigned by ATC are temperature compensated
and require no corrective action by pilots.)
Table 8.3 - 1 Values to be added by the pilot to minimum promulgated heights/altitudes (ft)
Aerodrome
Temperature
Height above the elevation of the altimeter setting source (ft)
200 300 400 500 1000 2000 3000 4000 5000
0º C 20 20 30 30 60 120 170 230 280
− 10º C 20 30 40 50 100 200 290 390 490
− 20º C 30 50 60 70 140 280 420 570 710
− 30º C 40 60 80 100 190 380 570 760 950
− 40º C 50 80 100 120 240 480 720 970 1210
− 50º C 60 90 120 150 300 590 890 1190 1500
Example: Aerodrome elevation: 1000 ft; Reported Temperature: 0ºC
Result: Fix Published Attitude Height above aerodrome
elevation Correction Indicated Attitude
FAF 4000 3000 170 4170
MDA 1400 400 30 1430
CHeers.
P.S. DAn WInterland, could you please elaborate more detailed on which ARR procedure it happened and where to pay attention, please. PM me if you want.
Thanks.
