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3 Answers

Online ATP weight & balance course

Asked by: 2360 views Commercial Pilot

Hey guys-

 

I am looking for an online course where I can learn the weight and balance info to prepare for my ATP written.  I know sheppard is great for memory but I want to learn how to do it, I bought the ASA practice test online, the only part I can't seem to figure out is the ATP weight and balance.  Any advice?

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3 Answers



  1. Wes Beard on May 19, 2014

    What part specifically are you struggling with. We can probably help you figure it out if you provide an example. I admire your drive to learn the material and not just memorize tye answer for the test.

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  2. Kev Hughes on May 19, 2014

    Thanks Wes, I am just figuring that if during the airline interviews I do well and someone asks me to do some questions that aren’t the standard ATP, that I don’t want to look like a total idiot and say… oh… I just memorized the answers, I have no idea how to do it.

    Ok, so there are two categories that I am having a hard time with…

    First, determining the STAM TRIM setting… It starts referring to LEMAC and MAC and I understand what those stand for but I look at the graphs and I am spun…

    Second is determining MAC based on the info provided…

    Any Youtube videos on this stuff? I searched but I haven’t found anything most people seem to just be memorizing the answer.

    Thanks.

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  3. Wes Beard on May 21, 2014

    Don’t you mean stab trim setting?

    I don’t have access to the newer ATP questions. Is the question like #45 in the sample ATP test bank from the FAA? If so which charts are you using from the linked supplements?

    http://www.faa.gov/training_testing/testing/test_questions/media/ATPSampleExam.pdf

    The way the jets I fly calculate stab trim and %MAC is pretty straight forward. Calculate CG like you would for any airplane and then apply a formula specific to the airplane to convert it to %MAC.

    The basic formula is this (CG-LEMAC)/(TEMAC-LEMAC)*100 when LEMAC is leading edge MAC (in CG) and TEMAC is trailing edge MAC (in CG).

    Once we figure out the %MAC we can look up in a table the stab trim setting we use for takeoff. The importance, in the jets I fly, of correctly setting the stab trim setting for takeoff cannot be understated. That stab trim setting is the pitch trim necessary to fly the airplane at V2. Imagine rolling down the runway and losing an engine at V1, when the PM calls rotate you should rotate smoothly up to the takeoff pitch attitude and need very little pitch trim to keep the airplane at V2.

    I could have just explained what you already know as I don’t have access to the latest test question bank. I hope this helps.

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