VMCA


Also found in: Acronyms.

VMCA

The minimum control speed in the air. The minimum flight speed at which the airplane is controllable with a maximum 5° bank when the critical engine suddenly becomes inoperative with the remaining engines at takeoff thrust. The conditions for calculations of VMCA are (i) critical engine at idle power setting, (ii) critical propeller windmilling, (iii) operating engine producing maximum thrust, (iv) landing gear and flaps up, (v) aircraft loaded at the most aft allowable center of gravity, (vi) aircraft loaded to the maximum gross weight, (vii) up to 5° of bank toward the operating engine, and (viii) atmospheric conditions normalized to standard day at sea-level pressure.
References in periodicals archive ?
Table 3 shows the time course of changes in Vmca, which increased in all three groups for five minutes after tourniquet deflation.
The present study shows that Vmca in all three groups increased after tourniquet deflation.
Eng et al (9) demonstrated that Vmca in the awake subjects was 63 [+ or -] 5 cm/s at a [P.sub.a]C[O.sub.2] of 40 mmHg, while with an infusion of propofol at 150 [micro]g/kg/min Vmca decreased to 38 [+ or -] 3 cm/s at the same [P.sub.a]C[O.sub.2].
Previous reports have shown that the increase in Vmca after tourniquet deflation is directly attributable to an increase in [P.sub.a]C[O.sub.2] (2,3).
Despite these uncertainties, we think that the changes in Vmca observed in this study were mainly effects of the different anaesthetic agents.
Radar data depicted the aircraft performing maneuvers resembling VMCA demonstrations, and slowing to about 71 knots' groundspeed before it descended in a left spin and impacted a house.