Altimetry problems and solutions.

[2 sheds]

Wings

Sorry - didn't intend to be curt, just to query the logic of calibrating against a RPS - that would not ensure accuracy.

Rgds

2 s

[wings folded]

No need to apologise 2sheds.

My suggestion of waiting for a stable anticyclonic system was to cover the snag that the regional QNH may vary from your location's QNH.

I happen to be close to an airport at the same elevation as me, so my local QNH is a good reference.

If that is not your set up, a good anticyclonic system with wide spaced isobars allows you to calibrate your altimeter from the regional (even Barnsley, for goodness sake) since the regional and your local QNH will be the same in a stable met condition.

Otherwise, what do you think of my suggestion?

I have an altimeter in my home which serves as a domestic barometer.

I happen to appreciate precision instruments in themselves, but when they are furthermore actually useful, I think that there is a double advantage

[DFC]

Here is something that does not appear to be covered but should be;

ABC airfield elevation 0ft

South of ABC is a hill 1000ft AMSL

Minimum Altitude to vector aircraft south of ABC is 2000ft

What is the minimum altitude the radar controller can descend an IFR flight being vectored south of ABC when the OAT at airfield is Minus 5C?

How would the answer change if the airfield had an elevation of 500ft but everything else remained the same?

Regards,

DFC

[ZOOKER]

DFC,
Interesting one. Are we talking 'D' Values here?

[DFC]

Are we talking 'D' Values here?

No. If you mean what I remember D values to be used for we would be talking about pressure pattern navigation.

The answer is actually quite simple if one uses either the table provided in the AIP or the rule of thumb provided in ICAO DOC 8168 Vol 1.

Regards,

DFC

[NIFTY SO AND SO]

Altimetry

Altimitry???

FROM HIGH TO LOW LOOK OUT BELOW!

Always served me in flying and ATC.

Cheers folks!