23.149 Vmc Determination is gone

troopernflight

troopernflight

Well-Known Member
Does anyone have any insider knowledge of what the FAA is doing with part 23? 23.149 (Minimum Control Airspeed) has disappeared. When it comes to explaining to students the parameters that manufacturer's use to determine Vmc, I'm not sure what section to refer to. In 23.2135 it now just states that Vmc must be determined with "the most critical configurations used in takeoff and landing operations". It doesn't break down what those critical configurations are like it did in 23.149.
 
troopernflight said:
Does anyone have any insider knowledge of what the FAA is doing with part 23? 23.149 (Minimum Control Airspeed) has disappeared. When it comes to explaining to students the parameters that manufacturer's use to determine Vmc, I'm not sure what section to refer to. In 23.2135 it now just states that Vmc must be determined with "the most critical configurations used in takeoff and landing operations". It doesn't break down what those critical configurations are like it did in 23.149.
Click to expand...


Did it actually say what configuration before? I thought that was a CAR 3 thing?

Anyway, each airplane may have a different most critical configuration.

Sent from my XT1650 using Tapatalk
 
Here's a copy of the original:

§ 23.149 Minimum control speed.
(a) VMC is the calibrated airspeed at which, when the critical engine is suddenly made inoperative, it is possible to maintain control of the airplane with that engine still inoperative, and thereafter maintain straight flight at the same speed with an angle of bank of not more than 5 degrees. The method used to simulate critical engine failure must represent the most critical mode of powerplant failure expected in service with respect to controllability.

(b) VMC for takeoff must not exceed 1.2 VS1, where VS1 is determined at the maximum takeoff weight. VMC must be determined with the most unfavorable weight and center of gravity position and with the airplane airborne and the ground effect negligible, for the takeoff configuration(s) with -

(1) Maximum available takeoff power initially on each engine;

(2) The airplane trimmed for takeoff;

(3) Flaps in the takeoffposition(s);

(4) Landing gear retracted; and

(5) All propeller controls in the recommended takeoffposition throughout.
 
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