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What's Q&H?  
User currently offlineVictor Hotel From Australia, joined Aug 2000, 305 posts, RR: 1
Posted (14 years 8 months 2 weeks 3 days 5 hours ago) and read 12526 times:

Quick question, whats Q&H that ATC refers to?
Thanks in advance

4 replies: All unread, jump to last
User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 1, posted (14 years 8 months 2 weeks 3 days 4 hours ago) and read 12517 times:

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"!
User currently offlineQNH1013 From Belgium, joined May 2001, 104 posts, RR: 0
Reply 2, posted (14 years 8 months 2 weeks 2 days 14 hours ago) and read 12483 times:

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


User currently offlineRyu2 From Taiwan, joined Aug 2002, 509 posts, RR: 0
Reply 3, posted (14 years 8 months 2 weeks 2 days 13 hours ago) and read 12477 times:

I've almost never heard the term QNH used by pilots/ATC in the States, they just say "altimeter"... I wonder why?

User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 4, posted (14 years 8 months 2 weeks 2 days 4 hours ago) and read 12462 times:

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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