QFE, QNH & QNE Pressure Settings of Altimeter|Change fromQNH toQNE Transition Altitude|Flight Level 

Natural earth=QNE ; Natural Horizon=QNH ; Field elevation=QFE ;))

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Hi hope you are good. I have a big list of interesting question for you pilot. Answer as much as you wish… 1. Who gives us trans level when it varies (atc , atis ,any others) 2. Trans alt is fixed for countries . How do they calculate it ? 3. What is the maximum thickness of transition layer. (the answer should highlight the importance of having the layer and not only 1 level reference but a layer...) 4.What are Common trans alt for some countries 5. Transition layer only climb and descent we never cruise there.Its not common for atc to say maintain FL or atltitude inside transition layer ( but if they ask maintain we should maintain... )but my question is that they ususally dont cruise there true... since we wanna climb and descend . And if controller said maintain a flight level or altitude in between the layer… it would be risk if no horizontal separation of aircraft also it would be risk if airclafy arf flying or descending around it true… 6.Why don’t all countries have the same transition altitude. 7. Is there a benefit of decreasing this transition altitude .I mean in Lebanon transition altitude is 13,000 ft while in germny transition altitude is around 5,000 ft. 8.Can we have sps standard pressure system 1013 hpa =qne at local conditions = qnh is it possible? 9.Whats if passing throght a surface inversion ? wouldn’t local presuure change.. would atc know or atis know if a surface inversion suddenly happened... 10.How many times do we usually change qnh : local pressure while climbing? While descending? 11.Who uses qfe the field of the pressure ? Russia? Airshows close close to the ground or even sometimes airlines to cross check things? 12.How is transition altitude determined? ( also note that Denali Mountain in USA is higher than trasn alt 18,000ft) (hmm i though trans alt should be clear of all obstacles) 13.What about the horizontal and vertical separation in transition layer? How is this done? Do different countries have different regulations and procedures for this? 14.What if it’s a busy airport like London heathrew airport and trans alt is low maybe I belive it's 3,000 ft . 15.1013.25 or 1013? Doesn’t it make a difference? Cant this rounding cause errors or accidents? 16.What is the relation between 1hpa = 27 ft around 9m …Is this number always constant ... shouldn't it vary with temperature or pressure? 17.If its foggy isn’t qfe field pressure better than qnh local pressure … also can you land if its extremely foggy and cant see anything? 18.There is an instrument in cockpit called radio altimeter (I n cat 2 or 3 ils) that works below 2,500 ft maybe that reads height (above that its doenst show )....it shows only in cat 2 or 3 but does it need the pressure as well? 19.What are rounded to 1000 ft and what are rounded to 500 ft ( trans alt and trans level) 20.How do you find qnh if you don’t have a control tower or traffic? 21.Do some counties have a fixed transition level ? 21.What if a country has many airports? Do they all have the same trans alt? same trans level ? hmm? 22.While descending some pilots put qnh long before reaching transition level ? hmm ?why? isn't this risk? Or im mistaken they apply qnh at

I have a doubt when QNH means pressure at mean sea level then how different aerodrome have different QNH at same time

When Pilot Set QFE in altimeter