ATPL Tips - Altimetry 2; Density Altitude & True Altitude

This is video 2 in my short series on altimetry. This covers a chunk of theory, starting with a method to answer altimetry questions, before covering the basics of Density Altitude and moving on to True Altitude.

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Intro & End music:

Creative Commons — Attribution 3.0 Unported — CC BY 3.0

[mohammadnafisidraque]

I have watched multiple videos on altimetry, and ALL of them just talks about what is this, what is that, all the basic knowledge and definitions that i have been tired of listening. But when it comes to solving ATPL questions, they didn't help at all to solve them. Until i found your video where you not only talk about the actual stuff that's NECESSARY but also solve some actual questions based on the prior topics discussed. Kudos to you for finally ending this suffering of endless complications. I subbed. You should keep on making these videos please, you're VERRY good at teaching.

[victoryavar]

Yo sir, deserve a medal. This exercises on my cbt were impossible for me to understand. However, you made it comprehensible and easy to follow, hopefully someday I can teach as good as you. Thanks a lot!!!

[floriandupras]

You made me save hours of work burning down my few neurones left ! Your explanations and demos are cristal clear, and still you remain humble! Wouldn’t know how to thank you. 🙏 👍

[generalaviation_greg]

You are a true natural at this! Not only is this enjoyable, it;s bar far the best explanation I've seen. Thanks a million Tom.

[Sayed.atpl.]

Thank you so much, , you just made a modular student life easier after struggling for a week 😅I managed to solve all the TA questions with your formula 🎉

[flimsywater]

Sir, you are a true hero. Thanks for helping me to get through my CPL.

[TheFlying]

Tom, these videos are absolutely fantastic! I’m just starting out on Met and came up against a hurdle with Altimetry, this series has really helped! Thanks mate.

[Backtoflying]

18:12 worth noting here that if the altimeter setting was provided in inches of mercury, you can just use 29.92-Altimeter Setting x 1000’ and get the feet delta from standard (FL) to indicated altitude.

Basically what these types of scenarios are trying to test you on is you are flying in the flight levels, and you have an error caused by deviation from standard pressure (ie low altimeter setting of the day) as well as a deviation caused by temperature in a large cold column of air between the aircraft and the altimeter setting source. These factors add up to potentially position the aircraft (much) lower than the expected true altitude when flying in the flight levels- this is why they are testing you on it to see if you can remember when flying in the flight levels that obstacles could get you. This becomes even more important in standard pressure regions where aircraft are flying flight levels below FL180 ie Northern Domestic Airspace and Europe.

Very helpful video!

[enesipek]

Finally, I got how I can calculate temperature corrections. The key point is "height above surface"😉 Thank you so much for the video🤗

[J-S-T]

When you know and understand the subject you won't find it hard to explain it! Well done.

[jcbmachify]

Extraordinary videos, very well explanations just to avoid misunderstandings and to be more obvious is better to associate QFE with "Height Above Ground" or "Ground Height" and not just "Height". Thank you for your detailed work.😀

[Kidii]

Thank you very much for your precious help. The way you break down everything makes it really clear 🙌🏻

[jorisvanvinckenroye]

THX !!! I am in my ATPL and love your sessions !
Greetings from Geneva !

[HIHaiki]

Just by looking at the ISA deviation which in the second question was ISA +15 you will automatically know the TA IS HIGHER ! Only one answer is possible 31800 ft . Just so you get a mental picture before calculating I guess .cheers for your explanation helps alot 👍

[arshdeepsingh]

Your videos really makes me enjoy ground school!

[anoopv]

I’ve a trick for the 2nd question from True Altitude . We don’t really need to solve the mos question as per the formula! It’s already given that the air temp is ISA+15. So we know that the conditions are warmer than ISA and TA should fall higher up from the indicated altitude/ QNH altitude of 30210ft. Only 1 option is good that it is greater than QNH altitude. Option b.

[solamigos]

This seemed impossible until I found your video! Thanks for your effort! From an ATPL student

[UXMindAcademy]

Extremely useful and so well explained! Thank you so much.

[dploit]

Sos un groso maestro ! gracias por lo videos! abz THANKS!🤗

[shy_skyboy]

when you finally get to do the altimetry exercises it's really satisfying🙏✈️