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Annex 16 - Environmental Protection Volume I
limits of the duration interval shall be chosen from the
PNLT(k) values closest to PNLTM - 10 or 90 as the case may
be.
4.6 Effective perceived noise level
The total subjective effect of an aeroplane flyover, designated
"effective perceived noise level", EPNL, shall be equal to the
algebraic sum of the maximum value of the tone corrected perceived
noise level, PNLTM, and the duration correction, D.
That is:
EPNL = PNLTM + D
where PNLTM and D are calculated in accordance with the
procedures given in 4.2, 4.3, 4.4 and 4.5. If the duration correction
D is negative and greater than PNLTM - 90 in absolute
values, D shall be taken as equal to 90 - PNLTM.
5. REPORTING OF DATA TO THE
CERTIFICATING AUTHORITY AND
CORRECTING MEASURED DATA
5.1 General
Data representing physical measurements or corrections to
measured data shall be recorded in permanent form and
appended to the record except that corrections to measurements
for normal equipment response deviations need not be
reported. All other corrections shall be approved. Attempts
shall be made to keep to a minimum the individual errors
inherent in each of the operations employed in obtaining the
final data.
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 aeroplane 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;
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 aeroplane information shall be
reported:
a) type, model, serial numbers (if any) of aeroplane and
engines;
b) gross dimensions of aeroplane and location of engines;
c) aeroplane gross mass for each test run;
d) aeroplane configuration such as flap and landing gear
position;
e) indicated airspeed in kilometres per hour (knots);
f ) engine performance in terms of net thrust, engine pressure
ratios, jet exhaust temperatures and fan or compressor
shaft rotational speeds as determined ftom aeroplane
instruments and manufacturer's data;
g) aeroplane height above ground determined by a method
independent of cockpit instrumentation, such as radar
tracking, theodolite triangulation or photographic scaling
techniques, to be approved by the certification authorities.
5.2.6 Aeroplane speed and position and engine performance
parameters shall be recorded at an approved sampling
rate sufficient to correct to the noise certification reference
conditions prescribed in this section and shall be synchronized
with the noise measurement.
5.2.6.1 Lateral position relative to the extended centre
line of the runway, configuration and gross mass shall be
reported.
5.3 Noise certification
reference conditions
Aeroplane position and performance data and the noise
measurements shall be corrected to the following noise certification
reference conditions:
a) meteorological conditions:
1) sea level atmospheric pressure of 1 013.25 hPa;
2) ambient air temperature of 25"C, i.e. ISA + 10°C
except that, at thc discretion of the certificating
authority, an alternative reference ambient air temperature
of lS°C, i.e. ISA may he used;
3) relative humidity of 70 per cent; and
c) atmospheric pressure. 4) zero wind;
APP 1-12
Appendix I Annex 16 - Environmental Protection
b) aeroplane conditions:
1) maximum take-off mass and landing mass at which
noise certification is requested;
2) approach angle of 3"; and
3) aeroplane height of 120 m (394 ft) above the
approach noise measuring station.
5.4 Data correction
5.4.1 The noise data shall be corrected to the noise certification
reference conditions as stated in 5.3. The measured
atmospheric conditions shall be those obtained in accordance
with Section 2 of this appendix. Atmospheric attenuation of
sound requirements are given in Section 8 of this appendix.
If a reference ambient air temperature of 15°C is used (see
5.3 a) 2)) a further correction of +1 EPNdB shall be added to
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