VMC

[DaleB]

Here's a really good example of what is not VMC: https://www.youtube.com/watch?v=r2MVDY8o7Bs 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.

[Marc Zeitlin]

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.

[martymayes]

The international organization (ICAO) recognizes Vmca as the official acronym and yes "a" whilst airborne.

[FlyingRon]

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.

[Jim Hann]

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.

[Richk]

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.

[gcvisel]

Hah! Does that mean that a non instrument rated pilot flying solo can log instrument time?

Sure. It does not mean you are qualified, but you still had the experience. I have 3.5 hours multi-engine time at night from 40 years ago while riding with my flight instructor from Virginia to Kansas (to visit Jim Bede!) It still counts as dual night multi time for this light sport pilot!

[gcvisel]

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 during takeoff climb (VMC), during takeoff ground roll (VMCG), and during approach and landing (VMCLand VMCL-2). ...

Uh, I think you guys have the wrong VMC! This forum is a takeoff of the IMC, Instrument Meteorological Conditions club that became part of the EAA. They are now starting Visual Meteorological Conditions clubs as part of EAA chapters, where they take a flight safety challenge and slowly explore it in a group setting. "What would you do in these conditions with this information?" kind of setting. I sat through one such scenario at a Chapter Leaders Training session at Oshkosh last September. It was a blast to tear into the scenarios, given only a part at a time, with suggestions, only to be followed with more of the unfolding scenario so we could do it again. Lot of fun, and some good sharing and learning about flying from that!

[gcvisel]

Can someone translate VMC into real words having to do with training and proficiency?

Someone at EAA needs to explain here what a VMC club is!!!

[martymayes]

Someone at EAA needs to explain here what a VMC club is!!!

It as to go higher than that! We need someone at the FAA to explain why they used the same acronym for two different topics!! Much confusion!