QNH, QFE and QNE - [Altitude, Height and Flight Levels explained]

The QNH and the QFE are pressure references, the QNE gives you the feet difference between your aircraft and the standard 1013hpa pressure reference.
The QNH is the pressure at the mean sea level expressed in Hpa, this pressure changes from place to place depending on the weather.
As you know with the night and day the level of the sea changes, and when talking about the QNH an average sea level between night and day has been used.
If you use the Mean Sea Level as your Altimeter pressure reference you will fly following Alitutdes.
It is important to use the QNH during the departure because you want to be separated from the obstacles and since the terrain uses the mean sea level as a reference you want to use the same reference, otherwise, the separation won't be possible.
The QFE is the pressure at your Airfield, an easy way to remember this is to take the F of QFE and associate it with the F of the Field, in this way you will never forget what the QFE is.
If you set the Pressure at your Airport as a reference you will fly following heights.
The QNE uses the Standard pressure reference of 1013,25 hpa which is used after passing the Transition Altitude.
If you use the 1013,25hpa as a Pressure reference you will fly following the Flight Levels.
Even if we commonly refer to QNE as a pressure reference if you really dive in deep you will find out that is not a pressure reference.
Watch the KZbin video below to get the full QNE detailed definition:
• QNE Is Not A Pressure ...
If you want to know more about the Transition Altitude watch the videos below:
• Altimeter Setting - [T...
• QNH and QNE Altimeter ...
As you can see an Aircraft flying at a constant level can fly using different pressure references.
==============================================================
Disclaimer:
THIS VIDEO IS FOR ENTERTAINMENT PURPOSES ONLY.
NOT FOR REAL-LIFE OPERATIONS.
PLEASE REFER TO THE OFFICIAL MANUAL AND DOCUMENTATION.
==============================================================

[@PILOTCLIMB]

Any question regarding QNH, QFE or QNE? Leave a comment below and I will help you out!

[@vantranthi398]

I knew that in some book they called QNE being pressure alttitude of an aircraft when it is on runway, so QNE is not a pressure value. 1013hPa ia standard pressure. Is it right?

[@PILOTCLIMB]

@@vantranthi398 This is true on a standard Atmosphere condition however, in real life the QNH varies thus, with a QNH of 1000hpa, at your airport, for example, the QNE is not your elevation anymore. Yes, many times we refer to QNE as the pressure reference however, if you look at its very correct definition is the difference expressed in feed between the 1013.25hpa and the aircraft.

[@vantranthi398]

@@PILOTCLIMB thank you very much for your reply. I have more questions 1) As you told “ QNE is the distance btw 1013hPa and aircraft”. We all know “distance btw aircraft and 1013hPa is Pressure altitude”. So why in some books people need to use QNE as pressure altitude? 2) 1013hPa is standard pressure, why in some book people need to use QNE as standard pressure. Should we confuse pilots by those 2 things? 3) In our area we follow ICAO and WMO terms. Would you tell me in which doc/book I may have QNE definition? Thank you in advance

[@doonaviation5864]

What is meant FL 380 in aviation?

[@PILOTCLIMB]

@@doonaviation5864 Hey, Thanks for watching!! FL380 equals 38000 feet from the Standard Pressure Reference of 1013.25Hpa.

[@slavimihaylov2455]

Great content, I was not able to understand this topic after couple of days reading, thanks to you capitan I understood it for 7 min!

[@PILOTCLIMB]

That's great! Thanks for watching!

[@Blackboykazakh]

Bro you are the best explainer ever have I seen! Just keep it up! Wish you all the best with your career!

[@aggelos931]

Thanks, short and simple. Didn't perfectly understand the concept by reading the course material so I had to google it and I found this.

[@PILOTCLIMB]

You are very welcome

[@muhammadfahamfaisal5880]

Well explained in short. This will clear all your doubts & you’ll get the explanation as well.

[@PILOTCLIMB]

Many thanks for your great support!! I'm glad the video helped

[@bassandre27]

Thanks for your explanation. Cheers from Brazil!

[@PILOTCLIMB]

You are very welcome!

[@hanadi48]

This is a great video.. I always struggled with understanding altimeter settings . Thank you very much.

[@alanwilldoit]

I love this so much. so clear and concise. This truly helps many student pilots in their journey. Thank you so much

[@PILOTCLIMB]

You are Very welcome!

[@RohitSharma-zg2ys]

best explanation ever. i am an A/C mechanic. you cleared my doubt.

[@PILOTCLIMB]

That's great!! Many thanks for watching and the comment!! Don't hesitate to ask any question..

[@dmns]

Thank you Captain, this really helped me understanding.

[@PILOTCLIMB]

That's great! You are very welcome!

[@madhvishrivastava3646]

Thank you for the very good explanation. I was struggling for the good explanation. Thanks alot.

[@PILOTCLIMB]

You are very welcome !!

[@BoitumeloTumiRikhotso]

Thank you so so much. The pictures have helped to cement the concept in my head. Very helpful as I’m busy with ground school at the moment; in time for my MET exam this week.

[@PILOTCLIMB]

That's great! I'm glad it helped!

[@fanoooooo6]

excellent break down and very clear , cheers fella , top bloke

[@PILOTCLIMB]

Thank you very much for the kind comments!! Don't hesitate to ask me any questions you might have!!

[@MrCed0802]

Very well explained. Thanks a lot ! Looking forward to new videos

[@PILOTCLIMB]

Hey!! I hope you are doing great!! I am very glad you find it useful! I wish you a great day Gabriele Pilotclimb.

[@therated661]

Short but definitely precise and comprehensive explanation. Thank you so much captain. Im Always looking for a brief answer to what are their differences and here you explained it in the most understandable manner. Earned you a subscriber! Safe skies

[@PILOTCLIMB]

Hey, welcome on board!! Thanks for watching and the kind comment !! Don't hesitate to ask me any questions when watching the rest of the videos..have a great weekend

[@ibeeadane4430]

I subscribe when they deserve it. And you well deserve it

[@PILOTCLIMB]

Many thanks for your support!

[@gregarmstrong8675]

a lot better than my IATRA notes I got here .

[@PILOTCLIMB]

Thanks for watching!

[@ruizhibai5692]

Hi,I'm a PPL student,could please make a video about how to use flight computer calculate true heading,TAS,variation…and so on ..…

[@PILOTCLIMB]

Hey, Thanks for watching and the comment!!I will take your request into consideration for a future video!!

[@robertoforbes3405]

Did you take the faa written as yet?

[@pelebar1636]

very nice explained very well. thank you.

[@PILOTCLIMB]

You are welcome

[@tinsebelja786]

Very nice video, explained much clearer than in my book

[@PILOTCLIMB]

Many thanks for your kind comment! Don't hesitate to ask any questions when watching the rest of the videos

[@abracadabra544]

Thank you for giving concrete examples (when do we use one and when the other) !

[@PILOTCLIMB]

You are welcome! You use the QNH when you are below the Transition Altitude, and the 1013 when above it during climb... During descent you use the 1013 until the Transition Level and than you switch to QNH.. In the Channel there are videos regarding Transition Altitude and Transition Level.. check them out and if you still have questions let me know ! I wish you a great day!👍

[@hajeralthehli86]

Hello Captain, could you please explain to me how the aircraft get separated since all planes maintain the same standard setting 1013 hPs during the cruise phase. Thanks

[@PILOTCLIMB]

Since they use the same pressure reference if they fly at different Flight Level they are separated. Check my videos regarding altimeter settings..

[@jacobmarshall7810]

You said about elevation. This elevation.. is it the height between the mountain and sea or is it the height between thr sea and ground?

[@PILOTCLIMB]

Hey, is the height between the top of the mountain and the sea..thanks for watching

[@erikdeme]

Great explanation, thanks a lot!

[@PILOTCLIMB]

You are very welcome

[@Eva-cs5le]

FANTASTIC VIDEO!!!! Thank you very much for taking the time to explain this

[@PILOTCLIMB]

Many thanks for watching!

[@ericgrim4602]

An explain how you adjust the flight with earth curves

[@PILOTCLIMB]

Hey, I'll take your suggestion into consideration for a future content

[@Jigden]

QFE is used by helicopters to land in unknown helipads. Great video

[@PILOTCLIMB]

Thanks for your comment! You are very welcome!

[@schellingwoude1]

Thanks for your very clear explanation!

[@PILOTCLIMB]

You are more than welcome!! Thanks for watching and the comment! Have a great day 👍

[@nicholasbarbier3310]

thank you sp much for this explanation, it was very helpful

[@PILOTCLIMB]

Glad you like it! Thanks for watching

[@tirsocanales8366]

Do you have a video showing how to fly into an airport with QFE???

[@PILOTCLIMB]

Not yet, I'll make it in the future!!

[@Antoine-Zim]

Very clear and informative. I get it now why I have to change the Baro en route flying on my sim.Thanks a lot for what you share with the aviation community.

[@PILOTCLIMB]

You are very welcome!

[@conned]

Above TA, you "pull STD" or set 29.92inhg or 1013.2mb, depending on your acft type pressure setting Baro window. From enroute, to descent to airport,At TL, you set QNH according to atis/metar. Both TA and TL height are indicated on Sid/stars and IAP/let down plates. In U.S, it FL180 strait line, Germany or EU is 5500TA, rest elsewhere could be 11,000ft TA(QNH) for Dep or FL130(STD), Arr."set QNH". Simple! I'm fan of PilotClimb too

[@arazali4002]

It was so much clear and good

[@PILOTCLIMB]

Thanks for watching

[@calebanani7665]

Thanks! It has been helpful and the explanation has been clear! 5/5 🙌🏽

[@PILOTCLIMB]

You are very welcome

[@eyoaniekanabasi1493]

Your videos are so helpful. Thank you Capitain

[@PILOTCLIMB]

You are more than.welcome!! Thanks for watching!

[@jinwelcesar4335]

Thank you for your informative video.

[@PILOTCLIMB]

Hey, thanks for watching!! Check out this video: kzbin.info/www/bejne/gIOzoolql8mNb9E

[@TheOrangeGecko]

Great video, very well explained!

[@jayshreepatil2929]

thank you bro great work make more videos on such topics...

[@PILOTCLIMB]

Hey!! Many thanks for watching and the kind comment!! Check the Channel I'm sure you will find some interesting videos 👍 don't hesitate to ask me any questions you might have

[@jayshreepatil2929]

It's all ok buddy but where could I ask you my doubts do you have any insta profile ??......and yes don't say thanks you really did the awesome work .....🤗

[@PILOTCLIMB]

@@jayshreepatil2929 You can ask your question in the comment here, no problem 👍

[@fascination3472]

Please make video on general navigation if you can

[@PILOTCLIMB]

Hey, thabks for your comment!! I'll take your suggestion under consideration for a future video

[@daniellu1507]

Could you do videos about weathers, like windshear , Jet streams ,CAT

[@captsonko.9345]

Thanks pilot nice work keep up.

[@PILOTCLIMB]

Thanks for watching!! Ask me any questions you might have when watching the rest odf the videos.

[@captsonko.9345]

will do thanks capt.

[@rodneyskennedy3163]

Very clear explanation thanks.

[@PILOTCLIMB]

I'm glad you liked the video!! Don't hesitate to ask me any questions when watching the rest of the PILOTCLIMB channel videos..

[@shahilmisran302]

Meticulous Explanation 👏🏼- A320 FO

[@PILOTCLIMB]

Many thanks for watching and the kind comment! Small correction regarding the video, We commonly refer to the QNE as a pressure reference, however, if you look at its definition is the vertical difference expressed in feet between the 1013Hpa isobar and your aircraft. I made a separate video about that: kzbin.info/www/bejne/l2jSlauFqL93q7M

[@benokohministries]

If you’re some where at 3,000 ft on final approach, and the QNH is 10.20 Hp, and field elevation is 433 ft, how then do you calculate how many feet to land? From the altimeter should you aim to torch down at 433 ft being the field elevation? I have tried aiming to land at 433 ft from the altimeter, but it doesn’t work. I would finally torch down at 344. Pls how do I calculate it right?

[@PILOTCLIMB]

Make sure that the QNH is correct, also check the Threshold elevation that sometimes is different than the airport elevation.

[@walrus7814]

very lovely and very helpful

[@walrus7814]

you are a lovely man

[@PILOTCLIMB]

Many thanks for watching and the great support! I wish you a great day! Please check the following video for a small correction on the definition of QNE: kzbin.info/www/bejne/l2jSlauFqL93q7M

[@miguelfernandes657]

Fantastic!

[@PILOTCLIMB]

Glad to read you like it! Thanks for watching

[@d.petrov4423]

I thought that the planes were taking off with QFE... Thanks for the vid!

[@akandindadyson3564]

Help me explain how to apply this when there a change in pressure during flght

[@JJ-bb3sv]

Thank you captain, great video and clear explanation! Would QFE then be useful for student pilots doing circuits at an airfield?

[@ugipilot4971]

When you say that the mean sea levels changes depending on the water, and when the Mountain takes as reference the QNH, should have also not change the Information regarding the height of the mountain on the charts all the time ? I this case there must be a safety separation to the height published on the charts of the terrain, which enusures Terrain separation even when the QNH changes are big ?

[@MrBasit1995]

Great video Captain ! very well explained. two thumbs up for your video 👍👍

[@PILOTCLIMB]

Hey, many thanks for watching and your support!! Have a great day!

[@zahariaandrei5756]

Thank you Căpitan.!

[@lakelamine]

Hi captain, please could you explain the air traffic controller areas and their areas limits

[@PILOTCLIMB]

Hey, many thanks for watching!! I will take your request into consideration for a future video!! I wish you a great day!

[@lakelamine]

@@PILOTCLIMB I'm grateful for you

[@Pilot.Kevs.]

well explained.

[@PILOTCLIMB]

Thank you!

[@tareQ832]

Explain about CBs

[@PILOTCLIMB]

I'll take your suggestion into consideration for a future content

[@Fahad_1605]

Sir please make a video on CONTOUR .

[@PILOTCLIMB]

I'll take your suggestion into consideration for a future content

[@bergspot]

Quite clear, thanks!

[@mahdi4277]

Thank you captain

[@PILOTCLIMB]

You are more than welcome! Please Check this quick for a small correction regarding QNE: kzbin.info/www/bejne/l2jSlauFqL93q7M

[@harshitbhardwaj2166]

Sir Does MSL keeps on changing from Place to Place??

[@PILOTCLIMB]

Hemy, thanks for watching, the Atmosphere makes the MSL to change constantly, in aviation a Datum is used to calculate where the MSL is depending on the period of the year.

[@hngtmrdn]

so helpful thankyou👏🏻👏🏻👏🏻👏🏻👏🏻

[@PILOTCLIMB]

You are very welcome!

[@sumitcreations3072]

Impressive explanation sir 👍👍

[@PILOTCLIMB]

Thanks for watching and the comment!! Have a great day!

[@nadine624]

great video, thanks!!

[@PILOTCLIMB]

Many Thanks for watching and the kind comment!

[@ebubekirtamgac5964]

First of all i want to thank you for this perfect awesome fantastic didactic and clear video, i have tried to understand this issue on many different sources but never got fully understand as a pilot candidate you have been my first info channel :) love from Turkey

[@PILOTCLIMB]

That's great!! I'm glad to see the video helped you!! Don't hesitate to ask me questions when watching the rest of the channel videos!!

[@baxnaano1436]

Waad ku mahdsan tahay cilmiga aad ii faaideysay 🇸🇴

[@PILOTCLIMB]

You are welcome🙏

[@JJegadeshPandian]

Please make a video on ILS or VOR

[@PILOTCLIMB]

I take your request into consideration for a future content.

[@hey-zq1vq]

Great video and explanation, Thank you :)

[@PILOTCLIMB]

You are welcome!! Thanks for watching! Don't hesitate to ask me any questions when watching the rest of the PILOTCLIMB channel videos..👍

[@syedavasiyath]

Can you do training on surveillance?

[@PILOTCLIMB]

I'll take your suggestion into consideration for a future content

[@syedavasiyath]

@@PILOTCLIMB if possible on ATM what is flight plan what are different attributes in it ? What is track and coupling ?

[@martin81bayern]

Thanks for the explanation. But in theory it would still be possible to do all the vertical seperation and flight level stuff based on QNH instead of QNE and considering that there is a bottom layer of terrain which cannot be used for aircraft separation. QNE seems to be a helper for the "terrain problem" only. Nothing more and nothing less. Many of abbreviations for relatively simple things... the aviation business really loves complex sounding abbreviations :D Greetings from south Germany

[@Hacker12128]

Thank you very much captain 👍👏

[@PILOTCLIMB]

You are more than welcome! I'm glad you liked it!!

[@studywithveer8962]

You are god teacher in aviation

[@antarabhadra5351]

Excellent description sir, thanks 🙏🏾

[@PILOTCLIMB]

You are welcome! Don't hesitate to ask me any questions when watching the rest of the PILOTCLIMB COMMUNITY videos 👍

[@antarabhadra5351]

@@PILOTCLIMB sure Captain

[@symonshuvo4219]

Good one. Thanks.

[@PILOTCLIMB]

Many thanks for watching and the comment!!Have a great day

[@ThePikeywayne]

Thank you

[@PILOTCLIMB]

You are welcome! Thanks for watching and the comment!

[@rabindrasah6983]

Nice video and concept is well understood

[@PILOTCLIMB]

hey, many thanks for watching, I'm happy the video helped you! I wish you a great day Gabriele

[@chetankumarsahu6344]

Make a video about airmenship basics plz

[@PILOTCLIMB]

Hey, many thanks for watching!! I'll take your suggestion under consideration!! It is a great topic!! Have a great day

[@PILOTCLIMB]

Hey, I hope you are doing great! I uploaded the video about airmanship yesterday! Enjoy 👍

[@johnhepworth9427]

Hi .. I am confused ..Just learning .. At take off, if i set the gauge to QNH, it will read 100 feet for example, then when i take off , do a circuit and prepare to land, then i choose to do something at 200 feet 1from the ground, doesn't the gauge tell me the wrong distance ? because when i get to 200 feet on the gauge i am actually at ground level !?

[@mohdhakim8216]

Thanks

[@PILOTCLIMB]

You are welcome!👍

[@lukasbauer586]

grazie mille !

[@PILOTCLIMB]

Prego... thanks for watching!!

[@fascination3472]

Nice Sir 👍👍

[@PILOTCLIMB]

I'm glad you liked the video!!

[@seankelly421]

Shot, this was the best!

[@PILOTCLIMB]

Many Thanks for watching and the kind comment!! Don't hesitate to ask any questions you might have when watching the rest of the videos!!

[@AccordionandViolinlife]

Excellent! so is QNE the same as ISA for air pressure?

[@PILOTCLIMB]

Hey, many thanks for another kind comment!! According to the ISA the pressure at the mean sea level (QNH) is 1013.25Hpa, which is the same as the standard pressure reference for QNE. In real life is extremely rare that the QNH equals the standard pressure of 1013.25Hpa. Let me know if you have more questions!!

[@saadaldossary4916]

@@PILOTCLIMBThank you for your informative video , so we can say the standard pressure in QNH is equal to QNE??

[@PILOTCLIMB]

@@saadaldossary4916 You are welcome, in ISA conditions the QNH equals to 1013.25hpa. Please note that even if we commonly refer to QNE as a standard pressure reference (1013.25 hPa) in reality is the difference between the 1013.25hpa and your aircraft expressed in feet. I made a separate video where I talk about this: kzbin.info/www/bejne/l2jSlauFqL93q7M Let me know if you still have any questions. Have a great day

[@p0954]

Well explained. I have just started going for my ppl and it’s only qnh and qfe that are used. This is the first time I’ve heard of qne

[@atifnuman3354]

Why don't we use QNE always instead of changing from QNH at transition altitude

[@atifnuman3354]

We can also get altitude of terrain in QNE reference

[@PILOTCLIMB]

Thanks for the comment, watch the other videos regarding altimeters.. i explain why you need to change the pressure reference..

[@phoonjzc]

Why cant set QNE for everywhere? No need rely on QNH and change at all airports

[@PILOTCLIMB]

Because the separation with obstacles won't be guaranteed..

[@phoonjzc]

@@PILOTCLIMB Hi I doing PPL not ATPL so appreciate if you explain more details. An example with mathematical figures will be appreciated.

[@abracadabra544]

feedback from my side, maybe don't use the loud engine sound for intro and finish of the video :D or at least not that loud. If you are listening with headphones or not prepared it may be disturbing

[@PILOTCLIMB]

Many thanks for your feedback!! You are right! I'll lower it! 👍

[@franzrapuano8183]

Hi, I would like to ask you something if you don´t mind, just an observation, when I was studying, long time ago, QNH was the pressure at the MSL, but calculated from the pressure at the airport and then reducing as per standard 1" ----1000ft in this way calculated the QNH. Is this still the way I supposed or not?. Thanks in advance

[@PILOTCLIMB]

Hey, many thanks for watching, and welcome on board!! Yes, as far as I'm aware, the QNH is still calculated starting from the pressure and the elevation of the airfield. Once you know the Airfield Pressure (QFE) and Elevation you can find what is the local QNH by applying the standard pressure variation of 30feet per Hpa. The temperature that is used to calculate the QNH from the QFE is the ISA. Don't hesitate to ask questions when watching the rest of the videos! I wish you a great weekend!👍

[@franzrapuano8183]

@@PILOTCLIMB Thanks a lot for the reply. Great videos

[@RohitSharma-zg2ys]

well, just a suggestion your next video could be on Auto Pilot system.

[@PILOTCLIMB]

I will take your request into consideration for a future video!! If you watch the sim videos I'm doing now you can learn a lot about AP

[@siddharthsingh350]

thanx

[@PILOTCLIMB]

You are welcome!! Thanks for watching and the comment!

[@akhidifa1141]

i'm aerospach enggenering can you tell how i acount QNH You at a strip which has an elevation of 780 feet. You set 1013 hPa on your subscale and the altimeter reads 930 hPa. The OAT reads 6°C. What is the QNH and the density altitude?

[@PILOTCLIMB]

Hey, I hope you are doing great!! Many thanks for watching the video!! When you are saying that the altimeter is reading 930 hpa do you mean 930 feet?

[@dr.celalettinucar]

Excuise me sir, i want to ask this definition to you which about Flight Level. Below the FL180 is FL or not? I know that above the tranaition altitude called as FL. But what is this meaning? Class A - Positive Control ATC exercises complete control in the Positive Controlled airspace. Jets are the primary user of Class A airspace. It ranges from 18,000 feet (Flight Level 180) to 60,000 feet (FL600). Altitudes 18,000 feet and above are called Flight Levels (FL). Class A airspace is not specifically charted on aeronautical charts. Operation is in accordance to Instrument Flight Rules (IFR). The aircraft must be equipped with appropriate IFR instrumentation, including a Mode C altitude reporting

[@PILOTCLIMB]

Good morning, I hope you are well!! In some places the Transition Altitude is fixed at 18000feet, thus above that is always FL. However, in Europe for example, the Transition Altitude changes from place to place depending on the Orography. Below the Transition Altitude during Climb you use Altitude and, above it you use the Flight Level. Let me know if I answered your question.. I also made few videos about this topic..

[@dr.celalettinucar]

@@PILOTCLIMB Thank you for your clarification. Your channel is very useful for student pilots like me. There are some differencies between icao and faa documants and sometimes it is difficult to understand for me. I understood by dint of your answer. Have a good day captain, best regards.

[@PILOTCLIMB]

You are welcome! Have a great day!

[@flapthrottle4394]

Thanks Captain 🧑‍✈️! I would appreciate videos about some stuff ...like....working of turbine engine, hydraulic system, PACK flow, cooling system, or emergency situation and the way you handle them...generator also in issue , Vx Vy, clear air turbulence....and so on... and many more. I think you understand what I mean. thanks. 🙏 greetings

[@PILOTCLIMB]

Hey, many thanks for watching! You actually gave me ideas for future videos 👍.. If you look in my channel I made already a video regarding Vx and Vy, check that out and let me know if you have any questions👍

[@cinammon]

Very clear, grazzie

[@georgeb6909]

Great explanation thank you!

[@PILOTCLIMB]

You are more than welcome!! Have a great day

[@calinutza33]

I subscribed anyway. ! 😜😎😍

[@bmo4533]

Hi Captain! What does "Q" stand for in QFE, QNE, and QNH?

[@brettsmith474]

Query nautical height

[@surendrakverma555]

Thanks 🙏

[@ManishBhanwariya]

Thanks sir😍😍😘

[@PILOTCLIMB]

Hey, many thanks for your comment and for watching! I wish you a great day Gabriele Pilotclimb

[@ClanLawrence]

Sorry, but your explanation and definition of QNE is incorrect. This seems to be a common misconception all over the internet, from some sources that should know better. What you are describing as QNE is the Standard Pressure Setting (SPS or STD). QNE is a different thing altogether. QNE is not a Subscale Setting, it is an altitude reading, more specifically it is the indicated altitude of an aircraft on the ground, at the runway threshold, with 1013 set on the subscale. It is used very rarely, in conditions of exceptionally low pressure where the QNH or QFE is so low it is past the range of the Altimeter Subscale and so is impossible to set.

[@PILOTCLIMB]

Thanks for your feedback! I made a separate video about the topic you commented!

[@ClanLawrence]

@@PILOTCLIMB Yes. Your definition of QNE is incorrect in that video too.

[@mishomishev3283]

gr8

[@PILOTCLIMB]

Glad you liked the video!!

[@abhishekbajimaya7350]

thank you sir

[@dr.celalettinucar]

Sir, you explained qnh as a "pressure at mean sea level and why we use it? because all terrain or obstacles around the airport such as top of mountains are declareted qnh height". I know this is true defining according to literature but i wonder that qnh is changing everyday but our charts and top of obstacles and terrain altitudes do not ! Temperature, air density, airmass pressure not same. On the other hand if this defining is true every top of terrain altitudes on the maps or charts will change everyday with variable qnh value... ( I know it is negliable little error but if you measure the same top of mountain heigh with a static gps which is referenced grs80 ellipsoid and qnh referenced altimeter same time, gps height will not change but altimeter height will chance a little bit because of every qnh referance changing...) I guess this error will solve in future by dint of satellite navigation technologies such as gps. Best regards

[@PILOTCLIMB]

Hey, many thanks for watching and for the thiughtful comment! You are right, depending on the Temperature and Density the space between the isobars can vary. Usually, that's not a problem, however when you have temperature that are 0 or negative it might become a problem, in fact we apply the Temperature corrections to the Altitudes that we are flying. This will make sure we stay separated to the obstacles. Have a great day!

[@dr.celalettinucar]

@@PILOTCLIMB Thank you for your comment.

[@vfx7t]

QFE : FIELD ELEVATION ; QNH NATURAL HORIZON ; QNE NATURAL EARTH : ;))

[@PILOTCLIMB]

Great comment!! Thanks for watching

[@vfx7t]

@@PILOTCLIMB je suis abonné !