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metres Approach measurement distance. The distance
from the runway threshold to the
approach measurement station along the
extended centre line of the runway.
Threshold of approach end of runway.
Start of noise certification approach flight track.
Position on measured take-off flight path corresponding
to apparent PNLTM at station K.
See 9.3.2.
metres Approach flight track distance. The distance
fro111 the runway threshold to the
approach flight track position along the
extended centre line of the runway for
which the position of the aeroplane need
no longer be recorded.
Position on reference take-off flight path corresponding
to PNLTM at station K. See 9.3.2.
APP 2-33
APPENDIX 3. NOISE EVALUATION METHOD FOR NOISE CERTIFICATION
OF PROPELLER-DRIVEN AEROPLANES NOT EXCEEDING 8 618 kg -
APPLICATION FOR CERTIFICATE OF AIRWORTHINESS FOR
THE PROTOTYPE ACCEPTED BEFORE 17 NOVEMBER 1988
Note.- See Part II, Chapter 6.
1. INTRODUCTION b) relative humidity not higher than 95 per cent and not
lower than 20 per cent and ambient temperature not
Note 1.- This noise evaluation method includes: above 35°C and not below 2°C at 1.2 m (4 ft) above
ground except that on a diagram of temperature plotted
a) noise certification test and measurement conditions; against relative humidity combinations of temperature
and relative humidity which fall below a straight line
b) measurement of aeroplane noise received on the ground; between 2°C and 60 per cent and 35°C and 20 per cent
and shall be avoidcd;
c) reporting of data to the certijicating authority and
correction of measured data.
Note 2.- The instructions and procedures given in the
method are clearly delineated to ensure unformity during
compliance tests, and to permit comparison between tests of
various types of aeroplanes, conducted in various geographical
locations. The method applies only to aeroplanes
within the applicability clauses of Part II, Chapter 6.
2. NOISE CERTIFICATION TEST
AND MEASUREMENT CONDITIONS
c) at 1.2 m (4 ft) above ground, instantaneous wind speed
shall not exceed 19 kmh (10 kt) and instantaneous
crosswind speed shall not exceed 9 km/h (5 kt). Flights
shall be made in equal numbers with tailwind and
headwind components; and
d) no temperature inversions or anomalous wind conditions
that would significantly affect the noise level of the
aeroplane when the noise is recorded at the measuring
points specified by the certificating authority.
2.3 Aeroplane testing procedures
2.1 General 2.3.1 The test procedures and noise measurement procedure
shall be acceptable to the airworthiness and noise
This section prescribes the conditions under which noise certifi- cehficating authorities of the State issuing the certification.
cation tests shall be conducted and the measurement procedures
that shall be uscd to mcasurc thc noisc made by thc acroplane 2.3.2 The aeroplane height and lateral position relative to
for which the test is conducted. the microphone shall be determined by a method independent
of normal flight instrumentation, such as radar tracking, theo-
2.2 General test conditions
dolite triangulation, photographic scaling techniques, or other
methods to be approved by the certificating authority.
2.2.1 Locations for measuring noise from an aeroplane in
flight shall be surrounded by relatively flat terrain having no 3. MEASUREMENT OF AEROPLANE NOISE
excessive sound absorption characteristics such as might be RECEIVED ON THE GROUND
caused by thick, matted or tall grass, shrubs or wooded areas.
No obstructions which significantly influence the sound field 3.1 General
from the aeroplane shall exist within a conical space above the
measurement position, the cone being defined by an axis 3.1.1 All measuring equipment shall be approved by the
normal to the ground and by a half-angle 75" from this axis. certificating authority.
2.2.2 The tests shall be carried out under the following 3.1.2 Sound pressure level data for noise evaluation
atmospheric conditions: purposes shall be obtained with acoustical equipment and
measurement practices that conform to the specifications given
a) no precipitation; hereunder in 3.2.
ANNEX 16 - VOLUME I APP 3-1 2411 1/05
Annex 16 - Environmental Protection Volume I
3.2 Measurement system
The acoustical measurement system shall consist of approved
equipment equivalent to the following:
a) a microphone system with frequency response compatible
with measurement and analysis system accuracy as
stated in 3.3;
b) tripods or similar microphone mountings that minimize
interference with the sound being measured;
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