Temperature error correction
 

Has anybody got a chart or know where I can a chart from the internet for Temperature error correction?

Table III-1-4-1 b) on page III-1-4-5 in PANS-OPS vol 1
(Link to PANS-OPS vol 1

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 :ok:

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)

Temp error corrections with this App !
 

@reynoldsno1
Surely that example is an over-reading ie 104 ft has to be subtracted from the indicated altitude to get the true altitude?

Sorry - you're quite right ... I've been working with high temperature figures too much recently!!

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.

Or you can work it out on your Jeppesen CR-5:

http://www.stefanv.com/aviation/flight_computers/cr.jpg


.... you DO carry one, don't you? ;)

Yes, but where's the LNAV/VNAV/Autotrim selector?:D

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