ADVOKS GLOBAL · KENYA
The Civil Aviation (Environmental Protection Aircraft Noise) Regulations, 2025
54. Test procedures
Edition: 2026-03-03 · In force
54. Test procedures
(1)The test procedures shall be acceptable to the airworthiness and noise certificating authority of the State of design.(2)The test procedures and noise measurements shall be conducted and processed in an approved manner to yield the noise evaluation measure designated as effective perceived noise level, EPNL, in units of EPNdB, as described in the Fifth Schedule of these Regulations.(3)Test conditions and procedures shall be closely similar to reference conditions and procedures or the acoustic data shall be adjusted, by the methods outlined in the Fifth Schedule of these Regulations, to the reference conditions and procedures under this part.(4)Adjustments for differences between test and reference flight procedures shall not exceed—(a)for take-off: 4.0 EPNdB, of which the arithmetic sum of Δ1 and the term –7.5 log (QK/QrKr) from Δ2 shall not in total exceed 2.0 EPNdB;(b)for overflight or approach: 2.0 EPNdB.(5)During the test the average rotor rpm shall not vary from the normal maximum operating rpm by more than ±1.0 per cent during the 10 dB-down period.(6)The helicopter airspeed shall not vary from the reference airspeed appropriate to the flight demonstration by more than ±9 km/h (±5 kt) throughout the 10 dB-down period.(7)The number of level overflights made with a headwind component shall be equal to the number of level overflights made with a tailwind component.(8)The helicopter shall fly within ±10° or ±20 m, whichever is greater, from the vertical above the reference track throughout the 10 dB-down period (see Figure 8-1).
(9)The helicopter height shall not vary during overflight from the reference height at the overhead point by more than ±9 m (±30 ft).(10)During the approach noise demonstration the helicopter shall be established on a stabilized constant speed approach within the airspace contained between approach angles of 5.5° and 6.5°.(11)Tests shall be conducted at a helicopter mass not less than 90 per cent of the relevant maximum certificated mass and may be conducted at a mass not exceeding 105 per cent of the relevant maximum certificated mass. For each of the three flight conditions, at least one test shall be completed at or above this maximum certificated mass.