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shall be approved by the certificating authority.
2.4.2 Position and performance data shall be corrected by
e) no temperature inversion or anomalous wind conditions the methods outlined in Section of this appendix to the
that would sig~lificantly affect the noise lcvcl of thc meteorolog~cal reference conditions specified in 5.3 a).
aeroplane when the noise is recorded at the measuring
points specified by the certificating authority.
2.3 Aeroplane testing procedures
2.3.1 The test procedures shall be acceptable to the
airworthiness and noise certificating authorities of the State
issuing the certificate.
2.3.2 The aeroplane testing procedures and noise
measurements shall be conducted and processed in an approved
manner to yield the noise evaluation measure designated as
effective perceived noise level, EPNL, in units of EPNdB, as
described in Section 4 of this appendix.
2.3.3 The aeroplane height and lateral position relative to
the extended centre line of the runway shall be determined by
a method independent of normal flight instrumentation, such
as radar tracking, theodolite triangulation or photographic
scaling techniques, to be approved by the certificating
authority.
2.4.3 Acoustic data shall be corrected by the methods
outlined in Section 5 of this appendix to the meteorological
reference conditions specified in 5.3 a) I), 2) and 3). Acoustic
data corrections shall also be made for variations of the test
minimum distance from the reference minimum distance
between the aeroplane's approach path and the approach
measuring point, a take-off path vertically above the flyover
measuring point and for differences of more than 6 m (20 ft)
in elevation of measuring locations relative to the elevation of
the nearest point of the runway.
2.4.4 The aerodrome tower or another facility shall be
approved for use as the central location at which measurements
of atmospheric parameters are representative of those conditions
existing over the geographical area in which aeroplane
noise measurements are made. However, the surface wind
velocity and ambient air temperature shall be measured near the
microphone position at the approach, sideline, and take-off
measurement locations, and the tests shall not be acceptable
unless the conditions conform to Section 2 of this appendix.
24/11/05 APP 1-2
Appendix 1 Annex 16 - Environmental Protection
3. MEASUREMENT OF AEROPLANE 3.3.2 The characteristics of the system shall comply
NOISE RECEIVED ON THE GROUND with the recommendations given in International Electrotechnical
Commission (IEC) Publication No. 179~w ith regard
to the sections concerning microphone and amplifier
3.1 General characteristics.
3.1.1 The measurements shall provide the data for deter- Note.- The text and specifications of IEC PubIication
mining one-third octave band noise produced by aeroplanes NO. 179~en titled "Precision Sound Level Meters" are incorduring
flight, at any required observation stations, as a function porated by reference into this appendix and are made a part
of time. hereoj4
3.1.2 Methods for determination of the distance from the
obse~ation stations to the aeroplane shall include theodolite
triangulation techniques, scaling aeroplane dimensions on photographs
made as the aeroplane flies directly over the measurement
points, radar altimeters, and radar tracking systems. The
method used shall be approved by the certificating authority.
3.1.3 Sound pressure level data for noise evaluation purposes
shall be obtained with approved acoustical equipment
and measurement practices that conform to the specifications
given hereunder (in 3.2 to 3.4).
3.3.3 The response of the complete system to a sensibly
plane progressive sinusoidal wavc of constant amplitude shall
lie within the tolerance limits specified in IEC Publication
No. 179,~ov er the frequency range 45 to 11 200 Hz.
3.3.4 If limitations of the dynamic range of the equipment
make it necessary, high frequency pre-emphasis shall be added
to the recording channel with the converse de-emphasis on
playback. The pre-emphasis shall be so applied that the instantaneous
recorded sound pressure level between 800 and 11 200
Hz of the maximum measured noise signal does not vary more
than 20 dB between the levels of the maximum and minimum
one-third octave bands.
3.2 Measurement system
3.3.5 The equipment shall be acoustically calibrated using
ne acoustical measurement system shall consist of approved facilities for acoustic free-field calibration and electronically
equipment equivalent to the following: calibrated as stated in 3.4.
a) a microphone system with frequency response compat- 3.3.6 A wind screen shall be employed with the microible
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