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Instrument knowledge test

Asked by: 1066 views Instrument Rating

What CAS must be used to maintain the filed TAS at the flight planned altitude if the outside air temperature is -5 degrees C??

I need help on how to approach this question. do i use my e6b? Thanks in advance

3 Answers



  1. Wes Beard on Jan 24, 2013

    Use the E6B. The manual will show you how to set pressure altitude and temperature. Once that us done find the CAS on the inside scale and read the TAS on the outside scale.

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  2. wes eads on Jan 24, 2013

    I finally found my answer….. you have to use your e6b
    1. set your pressure altitude
    2. Set your temperature
    3. then look at your TAS and right below that is your answer 139.

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  3. Lucas on Jan 26, 2013

    You can also use the CX2 online tool (or an electronic flight computer).

    http://www.asa2fly.com/Online-CX-2-Pathfinder-Flight-Computer-C274_category.aspx

    click on Flight (1)
    click on Airspeed (2)
    click on Req. CAS (3)
    Then enter the TAS (True Air Speed) and press enter, the OAT (Outside Air Temperature) and finally the Palt (Pressure Altitude) and press enter and voila there is your answer.

    Keep in mind that Lasergrade software has an electronic flight computer right on it (CATS does not), so you are able to answer all these questions by using it instead of doing it with the manual one (its less precise because it can be miss aligned by a 10th of an inch and give you an incorrect answer).
    Our courses show you how to effectively use an electronic E6B during the test.

    Cheers Lucas

    http://passfaaexams.com/

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