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Average ISA Deviation

Average ISA Deviation

Achieving a smooth descent

2 ratings
3 reviews
📚 Education
🗺️ Navigation
$3.99

Details

  • Released
  • Updated
  • April 10, 2013
  • December 21, 2025

Features

Developer

Juan Mauricio Padilla Villarreal
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Average ISA Deviation screenshot #1 for iPhone
Average ISA Deviation screenshot #2 for iPhone
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About

This utility helps professional pilots quickly calculate average ISA temperature deviation for descent planning on specific aircraft models. It simplifies manual calculations, reduces workload, and operates offline, making it ideal for cockpit use.

✓Calculate average ISA deviation
✓Reduce descent planning workload
✓Simplify manual calculations
✓Offline cockpit use
✓Designed by a pilot
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What's New in Average ISA Deviation

3.1

December 21, 2025

• Improved overall user workflow • Minor interface refinements and stability improvements

User reviews

Most RecentHighest RatedLowest Rated

Not accurate

Not very accurate. This app needs improvement.
Edward.SEdward.S

Response from developer

Thank you for your review. I’m sorry the app didn’t meet your expectations. Average ISA Deviation is actively being improved, and feedback like yours helps make it better. If you can share more details about the calculation or result you found inaccurate, I’d be happy to investigate and improve it in an upcoming release. aviationgrade.software@gmail.com

Great app... simple to use

Just what I needed.
A simple ISA converter that is quick and easy to use in the cruise for performance calculations.
capt squirrelcapt squirrel

Valeu ! ! !

Gostei do app. Muito fácil. Qualquer mane vai saber usar.
Só não tem 5 estrelas por que não é compatível com o iPhone.
eduardo eduardo

Response from developer

There is now iPhone version!

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FAQ

What is Average ISA Deviation used for?

Average ISA Deviation is a utility for professional pilots to calculate the average ISA temperature deviation. This calculation is crucial for correctly entering the DES FORECAST in the FMC of aircraft like the Boeing 737 (NG/MAX).

Does Average ISA Deviation work offline?

Yes, Average ISA Deviation is designed to work fully offline. This feature makes it ideal for use in the cockpit where internet connectivity may be unreliable or unavailable.

What is the price of Average ISA Deviation?

Average ISA Deviation is a paid application, priced at $3.99. This one-time purchase provides access to its flight planning calculation features.

What devices support Average ISA Deviation?

Average ISA Deviation is supported on both iPhone and iPad devices. It is designed to be accessible on common mobile platforms used by pilots.

How often is Average ISA Deviation updated?

The latest version of Average ISA Deviation is 3.1, last updated on December 21, 2025. Updates typically focus on refining features and ensuring compatibility with evolving aviation standards.

What is the age rating for Average ISA Deviation?

Average ISA Deviation has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger individuals interested in aviation.

Is Average ISA Deviation suitable for beginners?

While designed for pro pilots, the app simplifies complex calculations. However, its primary focus is on professional flight planning needs, not introductory aviation concepts.

Does Average ISA Deviation have ads?

No, Average ISA Deviation does not contain advertisements. As a paid application, it offers an ad-free experience for its users.