Victor Hotel
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Joined: Fri Aug 25, 2000 8:29 pm

What's Q&H?

Tue Aug 21, 2001 5:06 pm

Quick question, whats Q&H that ATC refers to?
Thanks in advance
Posts: 980
Joined: Sat Jan 27, 2001 6:53 am

RE: What's Q&H?

Tue Aug 21, 2001 6:01 pm

You're referring to QNH and it refers to the altimeter setting in inches or HPa.

There used to be many such Q-codes,stemming from the time telegraphy (Morse Code) was used as a means of communication.We're talking of WW2,before and after.

The Q means a question or request for information.QDM meant a request for course to a station,QDR course from a station.A request for QNH gives you the altimeter setting that shows airfield elevation above MSL when on the ground,QFE is the altimeter setting that shows 0 feet when on the ground.The difference between QNH and QFE is called QFF,but this is never used in operations.
"Luck and superstition wins all the time"!
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Joined: Mon May 14, 2001 6:32 am

RE: What's Q&H?

Wed Aug 22, 2001 8:21 am

So if the pressure is 1013hPa, ATC will tell ya:... with QNH1013.

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Joined: Tue Aug 06, 2002 8:18 am

RE: What's Q&H?

Wed Aug 22, 2001 8:52 am

I've almost never heard the term QNH used by pilots/ATC in the States, they just say "altimeter"... I wonder why?
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Joined: Sat Jan 27, 2001 6:53 am

RE: What's Q&H?

Wed Aug 22, 2001 6:00 pm

Yup,the Q-codes is basically a European (read British) invention,but used worldwide as it has been accepted by ICAO as one of the standards.
There are many minor differences between the U.S. and the rest of the world regarding civil aviation,QNH and Altimeter being one of them.Also,inches instead of HPa is used in North American airspace,there's a fixed transition altitude of 18 000 feet versus a different one for each airport in other countries,etc.,etc.
"Luck and superstition wins all the time"!

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