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5.1.2 All corrections shall be approved by the certificating
authority. In particular the corrections to measurements for
equipment response deviations shall be reported.
5.1.3 Estimates of the individual errors inherent in each of
the operations employed in obtaining the final data shall be
reported, if required.
5.2 Data reporting
5.2.1 Measured and corrected sound pressure levels shall
be presented in one-third octave band levels obtained with
equipment conforming to the Standards described in Section 3
of this appendix.
5.2.2 The type of equipment used for measurement and
analysis of all acoustic performance and meteorological data
shall be reported.
5.2.3 The following atmospheric environmental data,
measured immediately before, after, or during each test at the
observation points prescribed in Section 2 of this appendix
shall be reported:
a) air temperature and relative humidity;
b) maximum, minimum and average wind velocities; and
c) atmospheric pressure
5.2.4 Comments on local topography, ground cover, and
events that might interfere with sound recordings shall be
reported.
5.2.5 The following information shall be reported:
a) type, model and serial numbers (if any) of aircraft,
engines, propellers or rotors (as applicable);
b) gross dimensions of aircraft and location of engines and
rotors (if applicable);
c) aircraft gross mass for each test run and centre of gravity
range for each series of test runs;
d) aircraft configuration such as flap, air brakes and landing
gear positions and propeller pitch angles (if applicable);
e) whether auxiliary power units (APU), when fitted, are
operating;
f) conditions of pneumatic engine bleeds and engine power
take-offs;
g) indicated airspeed in kilometres per hour (knots);
h) 1) for jet aeroplanes: engine performance in terms of
net thrust, engine pressure ratios, jet exhaust temperatures
and fan or compressor shaft rotational
speeds as determined from aeroplane instruments and
manufacturer's data;
2) for propeller-driven aeroplanes: engine performance
in terms of brake horsepower and residual thrust or
equivalent shaft horsepower or engine torque and propeller
rotational speed as determined from aeroplane
instruments and manuhcturer's data;
3) for helicopters: engine performance and rotor speed
in rpm during each demonstration;
i) aircraft flight path and ground speed during each
demonstration; and
j) any aircraft modifications or non-standard equipment
likely to affect the noise characteristics of the aircraft
and approved by the certificating authority.
5.3 Reporting of noise certification
reference conditions
Aircraft position and performance data and the noise measurements
shall be corrected to the noise certification reference
APP 2-15 2411 1/05
Annex 16 - Environmental Protection Volume I
conditions as specified in the relevant chapter of Part 11, and b) computing the overall arithmetic average for each
these conditions, including reference parameters, procedures appropriate reference condition (take-off, overflight or
and configurations shall be reported. approach) using the values in a) and the related 90 per
cent confidence limits.
5.4 Validity of results
5.4.1 Three average reference EPNL values and their
90 per cent confidence limits shall be produced from the test
results and reported, each such value being the arithmetical
average of the adjusted acoustical measurements for all valid
test runs at the appropriate measurement point (take-off,
approach, or lateral or overflight, in the case of helicopters). If
more than one acoustic measurement system is used at any
single measurement location, the resulting data for each test
run shall be averaged as a sinde measurement. For heli-
Note.- For helicopters a jlight shall only be considered
valid ifsimultaneous measurements are made at all three noise
measurement locations.
5.4.2 The minimum sample size acceptable for each of the
three certification measuring points for aeroplanes and for each
set of three microphones for helicopters is six. The samples
shall be large enough to establish statistically for each of the
three average noise certification levels a 90 per cent confidence
limit not exceeding +1.5 EPNdB. No test result shall be omitted
from the averaging process unless otherwise specified by the
certificating authority.
copters, the three m&rophone test;esults for each flight should Note. -- Methods for calculating the 90 per cent confzdence
be averaged as a single measurement. The calculation shall be internal are given in Appendix 1 o f ~ o9c5 01,
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