ADVOKS GLOBAL · KENYA
The Civil Aviation (Environmental Protection Aircraft Noise) Regulations, 2025
21. Test procedures
Edition: 2026-03-03 · In force
21. Test procedures
(1)The test procedures shall be acceptable to the Authority.(2)The test procedures and noise measurements shall be conducted and processed in accordance with these regulations to yield the noise evaluation measure designated as effective perceived noise level, EPNL, in units of EPNdB, as described in the Fifth Schedule.(3)Acoustic data shall be adjusted by the methods outlined in the Fifth Schedule to the reference conditions specified in this chapter. Adjustments for speed and thrust shall be made as described in Section 8 of the Fifth Schedule.(4)Where the mass during the test is different from the mass at which the noise certification is requested, the necessary EPNL adjustment shall not exceed 2 EPNdB for take-offs and 1 EPNdB for approaches.(5)In determining the variation of EPNL with mass for both take-off and approach test conditions, data approved by the Authority shall be used.(6)The necessary EPNL adjustment for variations in approach flight path from the reference flight path shall not exceed 2 EPNdB.(7)For the approach conditions the test procedures shall be accepted if the aeroplane follows a steady glide path angle of 3° ± 0.5°.(8)Where quivalent test procedures different from the reference procedures are used, the test procedures and all methods for adjusting the results to the reference procedures shall be approved by the Authority. The amounts of the adjustments shall not exceed 16 EPNdB on take-off and 8 EPNdB on approach, and if the adjustments are more than 8 EPNdB and 4 EPNdB, respectively, the resulting numbers shall be more than 2 EPNdB below the noise limits specified under regulation 16.(9)For take-off, lateral, and approach conditions, the variation in instantaneous indicated airspeed of the aeroplane shall be maintained within ±3 per cent of the average airspeed between the 10 dB-down points. This shall be determined by reference to the pilot’s airspeed indicator. However, when the instantaneous indicated airspeed varies from the average airspeed over the 10 dB-down points by more than ±5.5 km/h (±3 kt), and this is judged by the certificating authority representative on the flight deck to be due to atmospheric turbulence, then the flight so affected shall be rejected for noise certification purposes.