Federal Aviation Administration, DOT

Pt. 36, App. K

APPENDIX K TO PART 36 - NOISE REQUIREMENTS FOR TILTROTORS UNDER
SUBPART K
K1
K2
K3
K4
K5
K6
K7

General
Noise Evaluation Measure
Noise Measurement Reference Points
Noise Limits
Trade-offs
Noise Certification Reference Procedures
Test Procedures
Section K1 General

This appendix prescribes noise limits and
procedures for measuring noise and adjusting
the data to standard conditions for tiltrotors
as specified in Section 36.1 of this part.
Section K2 Noise Evaluation Measure

(b) Flyover reference noise
points - 
As shown in Figure K2 below:

measurement

The following noise reference points must
be used when demonstrating tiltrotor compliance with section K6 (Noise Certification
Reference Procedures) and section K7 (Test
Procedures) of this appendix:
(a) Takeoff reference noise measurement
points - 
As shown in Figure K1 below:
(1) The centerline noise measurement
flight path reference point, designated A, is
located on the ground vertically below the
reference takeoff flight path. The measurement point is located 1,640 feet (500 m) in the
horizontal direction of flight from the point
Cr where transition to climbing flight is initiated, as described in section K6.2 of this appendix;
(2) Two sideline noise measurement points,
designated as S(starboard) and S(port), are
located on the ground perpendicular to and
symmetrically stationed at 492 feet (150 m)
on each side of the takeoff reference flight
path. The measurement points bisect the
centerline flight path reference point A.

(1) The centerline noise measurement
flight path reference point, designated A, is
located on the ground 492 feet (150 m)
vertically below the reference flyover flight

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The noise evaluation measure is the effective perceived noise level in EPNdB, to be
calculated in accordance with section A36.4
of Appendix A to this part, except corrections for spectral irregularities must be determined using the 50 Hz sound pressure
level found in section H36.201 of Appendix H
to this part.

Section K3 Noise Measurement Reference Points