PDA

View Full Version : Altitude corrections windy conditions over mountainous terrain


0074
5th Sep 2009, 10:16
In my pervious companies in Scandinavia we used at set of corrections when flying over mountainous terrain in windy conditions:

< 30 kts 0 ft
31 - 40 kts 500 ft
41 - 50 kts 1000 ft
51 - 60 kts 1500 ft
Over 60 kts 2000 ft

I have tried to locate the origin of these corrections but until now without any luck - does any of you know where they are documented ?
I found another set of corrections reading the Doc 8168 but they are lower. Does the above include corrections or marging for mountainwaves or unstable air that the Doc 8168 corrections do not take in account ?

:ugh:Which one is the correct correction to apply ?

The Doc 8168 corrections are:

Corrections for strong winds in mountanious areas :
20 kts : 53 ft
40 kts : 201 ft
60 kts : 455 ft
80 kts : 812 ft

parabellum
5th Sep 2009, 12:23
What aircraft please and what were your usual cruising altitudes, did you apply these corrections to your actual altitude by flying that much higher? Were they corrections to your MSA?

0074
5th Sep 2009, 12:57
Operate B737

Now operating in mountainous terrain with airport in 6000ft and MSA 160000 - approach starts at 11000ft

The earlier corrections were generel corrections in Europe over mountainous ares ei. Norway or the Italien/Austrian/French Alps. Altitutecorrections addet to MSA and Fix crossing altitudes.

JAR
5th Sep 2009, 18:10
Are they in your Part A?

0074
6th Sep 2009, 01:29
yes they were

Sleepybhudda
6th Sep 2009, 11:42
Have you tried JAR/EU-OPS 1?

0074
6th Sep 2009, 14:02
I have not I admit - the corrections have been there since I started flying B737 in 1986, so that is a few years before JAR ;)