What does QNH stand for?

happydude · 01-10-2003, 09:34 AM

I know what QNH means, im just wondering what the Q and the N and the H stand for. Ive looked through all my aviation books and I cant find the answer and I've also asked around :-wave

Earl

**rbbarker** · 01-10-2003, 10:04 AM

Quasi-NonHydrostatic model

Boyd Barker
Senior Command Captain
KBOS Hub Manager
WestWind Airlines

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happydude · 01-10-2003, 02:22 PM

Cool!! Thanks Boyd :-wave

Earl

**Peter_McLeland** · 01-10-2003, 07:41 PM

It was a war time "Q" code...QHN, QFE , QDM, QDR...there were a lot but they have mostly gone out of use now. QFE is the local altimeter setting for the airfield which will make your altimeter read Zero at touchdown. When it is set, your altimeter reads "Height" (Above the airfield). With QHN set your altimeter reads "Altitude" (Above Mean Sea Level). With the altimeter set to "Standard" 29.92 Hg or 1013.2Mbs it will read a "Flight Level" (Above absolutely nothing...but if everybody above the Transition Altitude sets it, then we can all fly a long way and maintain vertical separation from everybody else, inspite of the atmospheric pressure rising or falling along the way :-)

Regards,

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happydude · 01-13-2003, 02:20 PM

Thanks for the very informative post Peter. :-wave When you set in 29.92, is it QDR?

Earl

**Peter_McLeland** · 01-14-2003, 12:22 PM

>Thanks for the very informative post
>Peter. :-wave When
>you set in 29.92, is
>it QDR?
>

No Earl...I've forgotten what QDR is but it might be True Bearing From. QDM is Magnetic Course to steer To. I just can't remember what the Q code for Standard Altimeter setting is...could be QNE?

Regards,

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**C210** · 01-14-2003, 10:10 PM

G'day,

I think I heard somewhere that QNH stands for Quantum Nautical Height? Anybody else?

Cheers.

______________________________________

Gordon Edwards
gje99@postmark.net

**rbbarker** · 01-14-2003, 11:24 PM

I'm sticking by my first answer.

Boyd Barker
Senior Command Captain
KBOS Hub Manager
WestWind Airlines

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**Hakan_Olsson** · 01-15-2003, 11:35 AM

It's time for a history lesson !

All the Q-codes in aviation today comes from the good old days when morse code was used as the only way of wireless communication. Instead of transmitting a whole sentence it was easier just to transmit three letters such as "QNH" in that way there was no misunderstanding.

I'm far from an expert on morse code but here are two links if anyone is interested:

This one explains which combinations that were used in maritime and aeronautical service:

http://home.attbi.com/~k6df/codes/Qsigs.html

Here is the complete list of Q-codes:

http://home.attbi.com/~k6df/codes/Qsigs.html

I hope this will shed some light on the QNH question.

Best regards,
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