Welcome Guest. Sign in or Signup

3 Answers

Calculation for the XC flight(TO, Cruise, LDG)

Asked by: 2782 views Commercial Pilot, FAA Regulations, Flight Instructor, General Aviation, Instrument Rating, Private Pilot

Back in my PPL days, my instructor taught me to do the interpolation by taking difference between two values for the temp and elevation and then reinterpolate with the numbers. Is there any other ways that will help deduce accurate number through mathematical approach ?

 

Steve.

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.

3 Answers



  1. k-west on Jul 22, 2016

    Interpolation is a mathematical approach, isn’t it?

    http://ncalculators.com/geometry/linear-interpolation-calculator.htm

    +2 Votes Thumb up 2 Votes Thumb down 0 Votes



  2. Mark Kolber on Jul 22, 2016

    No. If you are looking for =accurate= numbers, interpolation from known values is the mathematical method.

    What else would you suggest?

    0 Votes Thumb up 1 Votes Thumb down 1 Votes



  3. Skyfox on Jul 30, 2016

    Interpolation is basically taking an average. For example, the winds aloft forecast is for 3000, 6000, 9000, etc. If you’re planning a flight at 4500 feet, you’d have to look at the forecast for 3000 and 6000 feet and figure a wind speed and heading that’s halfway between the numbers forecast for those other altitudes. If you were at 3500 or 5500 feet, or at an IFR altitude, you’d have to bias it more towards one or the other accordingly. Since forecasts are best guesses and not direct observations, there will nearly always be a difference between the numbers you use and the numbers you experience, so some error is to be expected regardless.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

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.