Welcome Guest. Sign in or Signup

2 Answers

‘Planned true airspeed’ and ‘actual true airspeed’

Asked by: 2847 views ,
Student Pilot

Aviation calculators compute ‘planned true airspeed’ and ‘actual true airspeed’ using pressure altitude, temperature and calibrated airspeed.

The results are different, probably because 2 different temperatures are used for the calculations.

Could somebody please explain the difference between the 2 calculations and the difference between the 2 temperatures used in the calculations?

Thanks

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

2 Answers



  1. KDS on Sep 29, 2017

    You broke the code. The planned is using the temperature you anticipate and the actual is the temperature you encounter once at that altitude.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  2. Charles22 on Sep 29, 2017

    Actually my electronic calculators uses 2 different methods to calculate the ‘planned’ and ‘actual’ airspeed and if you use the same temperature value for both methods with everything else also being equal, the results are different.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.