NCC.GEN.125 Rotor engagement – helicopters

INTENT OF THE RULE

(a)The following two situations where it is allowed to turn the rotor under power should be distinguished:

(1)for the purpose of flight, as described in the Implementing Rule;

(2)for maintenance purposes.

(b)Rotor engagement for the purpose of flight: it should be noted that the pilot should not leave the control when the rotors are turning. For example, the pilot is not allowed to get out of the aircraft in order to welcome passengers and adjust their seat belts with the rotors turning.

(c)Rotor engagement for the purpose of maintenance: the Implementing Rule, however, should not prevent ground runs being conducted by qualified personnel other than pilots for maintenance purposes. The following conditions should be applied:

(1)The operator should ensure that the qualification of personnel, other than pilots, who are authorised to conduct maintenance runs, is described in the appropriate manual.

(2)Ground runs should not include taxiing the helicopter.

(3)There should be no passengers on board.

(4)Maintenance runs should not include collective increase or autopilot engagement (risk of ground resonance).