14 CFR § 29.143

The rotorcraft must be safely controllable and maneuverable—

During steady flight; and

During any maneuver appropriate to the type, including—

Takeoff;

Climb;

Level flight;

Turning flight;

Autorotation; and

Landing (power on and power off).

The margin of cyclic control must allow satisfactory roll and pitch control at VNE with—

Critical weight;

Critical center of gravity;

Critical rotor r.p.m.; and

Power off (except for helicopters demonstrating compliance with paragraph (f) of this section) and power on.

Wind velocities from zero to at least 17 knots, from all azimuths, must be established in which the rotorcraft can be operated without loss of control on or near the ground in any maneuver appropriate to the type (such as crosswind takeoffs, sideward flight, and rearward flight), with—

Critical weight;

Critical center of gravity;

Critical rotor r.p.m.; and

Altitude, from standard sea level conditions to the maximum takeoff and landing altitude capability of the rotorcraft.

Wind velocities from zero to at least 17 knots, from all azimuths, must be established in which the rotorcraft can be operated without loss of control out-of-ground effect, with—

Weight selected by the applicant;

Critical center of gravity;

Rotor r.p.m. selected by the applicant; and

Altitude, from standard sea level conditions to the maximum takeoff and landing altitude capability of the rotorcraft.

The rotorcraft, after (1) failure of one engine, in the case of multiengine rotorcraft that meet Transport Category A engine isolation requirements, or (2) complete power failure in the case of other rotorcraft, must be controllable over the range of speeds and altitudes for which certification is requested when such power failure occurs with maximum continuous power and critical weight. No corrective action time delay for any condition following power failure may be less than—

For the cruise condition, one second, or normal pilot reaction time (whichever is greater); and

For any other condition, normal pilot reaction time.

For helicopters for which a VNE (power-off) is established under § 29.1505(c), compliance must be demonstrated with the following requirements with critical weight, critical center of gravity, and critical rotor r.p.m.:

The helicopter must be safely slowed to VNE (power-off), without exceptional pilot skill after the last operating engine is made inoperative at power-on VNE.

At a speed of 1.1 VNE (power-off), the margin of cyclic control must allow satisfactory roll and pitch control with power off.