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QNE, QNH, QFE  
User currently offlineTigermoth From India, joined Nov 2005, 7 posts, RR: 0
Posted (8 years 9 months 2 days 7 hours ago) and read 32767 times:

I know they are altimeter settings but can someone explain what they mean and when they are used? Many thanks

8 replies: All unread, jump to last
 
User currently offlineTristarSteve From Sweden, joined Nov 2005, 3999 posts, RR: 34
Reply 1, posted (8 years 9 months 2 days 6 hours ago) and read 32767 times:

QNE Height above sea level at standard setting 1013
QFE Height above airfield
QNH Height above sea level.

Type QNE into google and there is a good description in the third ref.


User currently offlineJulesmusician From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 9 months 2 days 6 hours ago) and read 32767 times:

Basically the codes were meant to mean:

QFieldElevation
QNauticalHeight
QNauticalEquivalent


User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 3, posted (8 years 9 months 2 days 5 hours ago) and read 32767 times:

Another gouge that I saw in Professional Pilot magazine many years ago:
Q oceaNHeight
Q Feet above Earth
Q staNdardprEssure


User currently offlinePW4084 From United States of America, joined Mar 2001, 291 posts, RR: 0
Reply 4, posted (8 years 9 months 2 days 5 hours ago) and read 32767 times:

Here's another way of remembering these:

QNE = EASY, always 29.92

QNH = HARD, as in the ground is very hard... so set your altimeter properly.

QFE = simply field elevation

PW4084


User currently offlineTigermoth From India, joined Nov 2005, 7 posts, RR: 0
Reply 5, posted (8 years 9 months 1 day 12 hours ago) and read 32767 times:

Thank you all for your replies. Its not really what each of the Q codes mean that i am unclear about, but solving problems related to Q codes (in ground school) that I cannot seem to understand..for example, how do I go about solving this quiz: (I hope I got it right)

"An a/c is flying at FL85 and is cleared to descend to 3500 feet on QNH 1000, but the pilot finds his altimeter stuck. To what height must he descend?"

Thanks / Tigermoth


User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 6, posted (8 years 9 months 1 day 10 hours ago) and read 32767 times:

And how will he know, with his altimeter stuck?  Wink

Let us, for the sake of the discussion, assume that it is instead the altimeter setting (Kohlsmann) mechanism which has stuck.

First off, he should descend to a height of 3,500 feet ASL. That is what they tell him to do. How to actually go about this will become a bit tricky though, as he cannot change his altimeter setting which means his altimeter will misread.

1 hPa is approx equal to 30' of altitude.

If you increase the reference pressure (Kohlsmann setting), the difference between your current (lower) ambient pressure and the reference pressure increases. Your indicated altitude increases.

In the example given, you will be flying at an altimeter setting of 1013 when you should have 1000. This means your altimeter will overread by (1013-1000)*30 feet, or 390 feet. Descend to 3500+390=3890 feet of altitude.

Another way to think about it is "altimeter setting down, altitude down". Picture yourself at your intended 3,500 feet at the correct QNH of 1000. How would you get to your actual QNH of 1013? You'd increase QNH - alas, increase the indicated altitude.



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineNoelG From , joined Dec 1969, posts, RR:
Reply 7, posted (8 years 8 months 4 weeks 1 day 22 hours ago) and read 32767 times:

Quoting PW4084 (Reply 4):
QNE = EASY, always 29.92

Unless you're anywhere outside of the USA. It's 1013 everywhere else!  Smile

I always remember by:

QNH: QNationalHeight
QFE: QFieldElevation

Warped logic in the NationalHeight but in my mind it means "Not the airfield height, the height of everything else"!  Smile


User currently offlineTigermoth From India, joined Nov 2005, 7 posts, RR: 0
Reply 8, posted (8 years 8 months 4 weeks 1 day 7 hours ago) and read 32767 times:

Thank you Fred and Noel for your replies, getting clearer now.

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