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6.1.2 The type of equipment used for measurement and
analysis of all acoustic helicopter performance and meteorological
data shall be reported.
6.1.3 'The following atmospheric environmental data,
measured immediately before, after, or during each test at the
observation point prescribed in Section 2 of this appendix shall
be reported:
a) air temperature and relative humidity;
b) wind speeds and wind directions; and
c) atmospheric pressure.
6.1.4 Comments on local topography, ground cover and
events that might interfere with sound recording shall be
reported.
6.1.5 The following helicopter information shall be
reported:
a) type, model and serial numbers of helicopter, engine(s)
and rotor(s);
b) any modifications or nonstandard equipment likely to
affect the noise characteristics of the helicopter;
c) maximum certificated take-off and landing mass;
d) indicated airspeed in kilometres per hour (knots) and
rotor speed in rpm during each demonstration;
e) engine performance parameters during each demonstration;
and
helicopter height above the ground during each
demonstration.
6.2 Reporting of
noise certification
reference conditions
Helicopter position and performance data and noise measurements
shall be corrected to the noise certification reference
conditions specified in Part 11, Chapter 11, 11.5. These
conditions, including reference parameters, procedures and
configurations shall be reported.
6.3 Validity of results
6.3.1 The measuring point shall be overflown at least six
times. The test results shall produce an average SEL and its
90 per cent confidence limits, the noise level being the
arithmetic average of the corrected acoustical measurements
for all valid test runs over the measuring point for the
reference procedure.
6.3.2 The sample shall be large enough to establish statistically
a 90 per cent confidence limit not exceeding k1.5 dB(A).
No test results shall be omitted from the averaging process
unless approved by the certificating authority.
Note.- Methods for calculating the 90 per cent confidence
interval are given in Appendix 1 of the Environmental
Technical Manual on the Use of Procedures in the Noise
Certification of Aircraft (Doc 9501).
APP 4-4
APPENDIX 5. MONITORING AIRCRAFT NOISE ON AND
IN THE VICINITY OF AERODROIVIES
Note.- See Part III.
1. INTRODUCTION
Note 1.- The introduction ofjet aircraft operations, as well
as the general increase in air trafJic, has resulted in internafiunal
concern over aircraji noise. To facilitate international
collaboration on the solution of aircraft noise problems, it is
desirable to recommend a procedure for tnonitorirlg aircruji
noise on and in the vicinity of aerodromes.
Note 2.- In this appendix monitoring iv understood to be
the routine measurement of noise levels created by aircrafl in
the operation of an aerodrome. Monitoring usually involves a
large number of measurements per dny, from which an
immediate indication of the noise level may be required.
Note 3.- This appendix specijies the measuring equipment
to be used in order to measure noise levels created by aircraft
in the operation of an aerodrome. The noise levels measured
according to this appendix are approximations to perceived
noise levels PNL, in PNdB, as calculated by the method
described in Appendix 1, 4.2.
Monitoring of aircraft noise should be carried out either with
mobile equipment, often using only a sound level meter, or
with permanently installed equipment incorporating one or
more microphones with amplifiers located at different positions
in the field with a data transmission system linking the
microphones to a central recording installation. This appendix
describes primarily the latter method, but specifications given
in this appendix should also be followed, to the extent the
specifications are relevant, when using mobile equipment.
2. DEFINITION
Monitoring of aircraft noise is defined as the routine measurement
of noise levels created by aircraft on and in the vicinity of
aerodromes for the purpose of monitoring compliance with and
checking the effectiveness of noise abatement requirements.
or apparatus located at one or more fixed positions in the field
linked through a radio transmission - or cable system
(e.g. telephone line) to a centrally located recording device.
3.2 The characteristics of the field equipment, including
the transmission system, should comply with IEC Publication
No. 179,' "Precision Sound Level Meters", except that frequency
weighting equal to the inverse of the 40 noy contour
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