How can i get true airspeed

At altitudes close to sea level, temperatures close to the International Standard Atmosphere and slow speeds, your Indicated Airspeed, and True Airspeed are very close to each other. But when you get hotter, colder, go faster or higher, the two differ from each other dramatically.

For example, at 25, feet the King Air I fly shows knots indicated, but I file for knots true airspeed on my flight plan. The altitude and temperature are what drives the two apart. Note, if I the airmass I flew through had no wind, my ground speed and true airspeed would be identical. But you can calculate it based on the current conditions.

Consult your manual on how to get to the display as each system is slightly different. Your FAA flight plan requires a true airspeed. You will use TAS when you plan for your flight because it is a reflection of how fast you will actually fly through the air on any given flight. Therefore, it makes sense to use it on a flight plan. It will only vary if you change a power setting or throw out the ice vanes anti-ice equipment. The AIM requires you report to ATC or FSS anytime the average true airspeed at cruising altitude varies by 5 percent or 10 knots whichever is greater from that filed in the flight plan.

So, if you normally fly at 10o knots true airspeed, you need to report if you are flying faster than knots or if you slowed to below 90 knots. TAS is given in mph. KTAS is true airspeed given in knots.

All cross country aviation calculations are based on flying at the planned true airspeed, generally defines as the speed of the airplane through the relatively undisturbed airmass.

To quickly calculate your true airspeed while actually in flight to a very close estimate, execute the following instructions. This is an accepted method for taking the estimated air temperature at altitude without actually knowing the outside air temperature OAT. Remember, the units you use must be equivalent, i.

Rotate the inner scale so that , or "10," on the inner scale is under the "STAT" index arrow. Look at the "NAUT" index arrow on the outer scale to determine 87 kt. Use your flight computer to solve these practice problems answers are located below. NM SM. Check out our Products. Ground speed is used to determine how long to a destination. True airspeed is used with the Pilot Operating Handbook to determine rates of fuel consumption over that period of time. Skip to content Subscriber question: "True Airspeed.