Pt. 36, App. K

14 CFR Ch. I (1-1-19 Edition)

Section K5 Trade-Offs
If the noise evaluation measurement exceeds the noise limits described in K4 of this
appendix at one or two measurement points:
(a) The sum of excesses must not be greater than 4 EPNdB;
(b) The excess at any single point must not
be greater than 3 EPNdB; and
(c) Any excess must be offset by the remaining noise margin at the other point or
points.

K6.1 General Conditions
(a)-(b) [Reserved]
(c) The takeoff, flyover and approach reference procedures must be established in accordance with sections K6.2, K6.3 and K6.4 of

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Section K6 Noise Certification Reference
Procedures

this appendix, except as specified in section
K6.1(d) of this appendix.
(d) If the design characteristics of the
tiltrotor prevent test flights from being conducted in accordance with section K6.2, K6.3
or K6.4 of this appendix, the applicant must
revise the test procedures and resubmit the
procedures for approval.
(e) The following reference atmospheric
conditions must be used to establish the reference procedures:
(1) Sea level atmospheric pressure of 2,116
pounds per square foot (1,013.25 hPa);
(2) Ambient air temperature of 77
SectionFahrenheit (25 SectionCelsius, i.e. ISA + 10 SectionC);
(3) Relative humidity of 70 percent; and
(4) Zero wind.
(f) For tests conducted in accordance with
sections K6.2, K6.3, and K6.4 of this appendix,
use the maximum normal operating RPM