Temperature error correction
Joined: Nov 2005
Posts: 51
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From: Norway
Table III-1-4-1 b) on page III-1-4-5 in PANS-OPS vol 1
(Link to PANS-OPS vol 1
(Link to PANS-OPS vol 1
Joined: May 2006
Aviation Qualifications: CPL
Posts: 578
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From: Australia
We publish 2 tables in the front of our departure and approach procedures here in Oz
Airservices Australia AIS - DAP 129 - Legend, General Info and Tables
See the tables 2 and 3, they are both the same but one is used for initial approach altitudes and the other is a bit more accurate and used for MDA adjustments.
Cheers
Alpha
Airservices Australia AIS - DAP 129 - Legend, General Info and Tables
See the tables 2 and 3, they are both the same but one is used for initial approach altitudes and the other is a bit more accurate and used for MDA adjustments.
Cheers
Alpha
Joined: Jan 2000
Posts: 1,415
Likes: 90
Rule of thumb is 4ft per 1000ft above AD per AD temp degree of difference from ISA
i.e. AD @ 1000ft amsl @ 0C w/FAP at 3000ft alt
FAP height = 2000ft
AD ISA temp = 13C, so difference from ISA = -13
Temp error = 4 x 2 x 13 = -104ft (underread)
i.e. AD @ 1000ft amsl @ 0C w/FAP at 3000ft alt
FAP height = 2000ft
AD ISA temp = 13C, so difference from ISA = -13
Temp error = 4 x 2 x 13 = -104ft (underread)
Joined: Sep 2011
Posts: 7
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From: Canada
Temp error corrections with this App !
Several complaints suggest that your post is in the vein of free advertising. If you wish to advertise your product, by all means organise that through the system. JT
Last edited by ColdCalc; 3rd November 2011 at 03:16.
Joined: May 2006
Posts: 40
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From: Calgary, AB, Canada
Cold Temp Correction Chart
This table is a little easier to use than the graphs in previous links.
RAC - 9.0 INSTRUMENT ARRIVAL FLIGHT RULES (IFR) ? ARRIVAL PROCEDURES - Transport Canada
Look at figure 9.1.
This is what our regulator here in Canada publishes and I have to say we are pretty used to cold temps here.
RAC - 9.0 INSTRUMENT ARRIVAL FLIGHT RULES (IFR) ? ARRIVAL PROCEDURES - Transport Canada
Look at figure 9.1.
This is what our regulator here in Canada publishes and I have to say we are pretty used to cold temps here.
Joined: Apr 2006
Posts: 674
Likes: 10
From: Krug departure, Merlot transition
Another rule of thumb
The one I use is that the altimeter will be off by 4% for every 10º off ISA. Obviously if it's cold the altimeter will overread (ie it will be "dangerous") and if it's warm it will be "conservative" (ie underread).
So for a simple example if the published OM crossing height is 1000' at a sea level airport, and the OAT is -5° (ISA minus 20), you can expect the altimeter to overread by 8% (so 1080' at the OM.)
MD
So for a simple example if the published OM crossing height is 1000' at a sea level airport, and the OAT is -5° (ISA minus 20), you can expect the altimeter to overread by 8% (so 1080' at the OM.)
MD
