The Civil Aviation (Environmental Protection Aircraft Noise) Regulations, 2025

52. Overflight Reference Procedures.

Edition: 2026-03-03 · In force

52. Overflight Reference Procedures.

(1)The overflight reference procedure shall be established as follows—

(a)the helicopter shall be stabilized in level flight overhead the flight path reference point at a height of 150 m (492 ft);

(b)a speed of 0.9 VH or 0.9 VNE or 0.45 VH + 120 km/h (0.45 VH + 65 kt) or 0.45 VNE + 120 km/h (0.45 VNE + 65 kt), whichever is the least, shall be maintained throughout the overflight reference procedure;

(c)the overflight shall be made with the rotor speed stabilized at the maximum normal operating rpm certificated for level flight;

(d)the helicopter shall be in the cruise configuration; and

(e)the mass of the helicopter shall be the maximum take-off mass at which noise certification is requested.

(2)The value of VH and/or VNE used for noise certification shall be quoted in the approved flight manual.

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Source: Kenya Law