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Thread: VMC

  1. #11
    DaleB's Avatar
    Join Date
    Sep 2015
    Quote Originally Posted by Cary View Post
    Here's a really good example of what is not VMC: Be sure to watch to the end, to see how close they really were.
    I notice they made sure not to show a complete N-number there.
    Measure twice, cut once...
    scratch head, shrug, shim to fit.

  2. #12

    Join Date
    Oct 2014
    Tehachapi, CA
    Quote Originally Posted by martymayes View Post
    That would technically be called Vmca. We are sticklers here for exactness.
    Well, exactly per CFR 14 Part 23.149, they call it Vmc :-). No "a", although some folks do use the "a" for airborne, and a "g" for ground.

  3. #13

    Join Date
    Jul 2011
    Clarklake, MI
    The international organization (ICAO) recognizes Vmca as the official acronym and yes "a" whilst airborne.

  4. #14
    FlyingRon's Avatar
    Join Date
    Aug 2011
    CJR / NC26
    Quote Originally Posted by Dana View Post
    Hah! Does that mean that a non instrument rated pilot flying solo can log instrument time?
    Absolutely. Same as an instrument rated pilot not on an IFR clearance.

  5. #15
    Jim Hann's Avatar
    Join Date
    Aug 2011
    Ballwin, Missouri, United States
    Quote Originally Posted by Marc Zeitlin View Post
    Well, exactly per CFR 14 Part 23.149, they call it Vmc :-). No "a", although some folks do use the "a" for airborne, and a "g" for ground.
    Actually Marc 23.149(f) talks about VMCG (they put it all in caps in the rule)

    Now if you really like letters here is a quote from AC 25-7B which is the guide to certifying your Part 25 aircraft.

    23. Minimum Control Speed - § 25.149
    a. Explanation
    Section 25.149 defines requirements for minimum control speeds duringtakeoff climb (VMC), during takeoff ground roll (VMCG), and during approach and landing (VMCLand VMCL-2). The VMC (commonly referred to as VMCA) requirements are specified in§ 25.149(a), (b), (c) and (d); the VMCG requirements are described in § 25.149(e); and the VMCLand VMCL-2 requirements are covered in § 25.149(f), (g) and (h). Section 25.149(a) states that“...the method used to simulate critical engine failure must represent the most critical mode ofpowerplant failure with respect to controllability expected in service.” That is, the thrust lossfrom the inoperative engine must be at the rate that would occur if an engine suddenly becameinoperative in service.

    But you are correct that there is no official Vmca definition for the US FAA.
    Jim Hann
    EAA 276294 Lifetime
    Vintage 722607
    1957 Piper PA-22/20 "Super Pacer"
    Chapter 32 member
    Fly Baby/Hevle Classic Tandem

  6. #16

    Join Date
    Feb 2017
    VMC as having to do with training and proficiency = two or more people engaged in hangar flying discussion, in order to learn and gain insight in all aspects of flying. A good pilot is all ways learning.

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