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atmospheric conditions.
9.7 Approach angle correction
Whenever the aeroplane approach angle during the noise certification
approach test is different from the reference approach
angle, a correction shall be applied to the EPNL value calculated
from the measured data. The corrections shall be determined
from the manufacturer's data (approved by the
certificating authority) in the form of tables or curves such as
schematically indicated in Figure A 1 - 12. The manufacturer's
data shall be applicable to the noise certification reference
atmospheric conditions and to the test landing mass.
APP 1-34
APPENDIX 2. EVALUATION METHOD FOR NOISE CERTIFICATION OF:
1.- SUBSONIC JET AEROPLANES -
Application for Certificate of Airworthiness
for the Prototype accepted on or after
6 October 1977
2.- PROPELLER-DRIVEN AEROPLANES OVER 5 700 kg -
Application for Certificate of Airworthiness
for the Prototype accepted on or after
1 January 1985 and before 17 November 1988
3.- PROPELLER-DRIVEN AEROPLANES OVER 8 618 kg -
Application for Certificate of Airworthiness
for the Prototype accepted on or after
17 November 1988
4.- HELICOPTERS
Note.- See Part ZI, Chapters 3, 4 and 8.
1. INTRODUCTION procedures for correcting noise levels from non-reference to
reference conditions are included in Sections 6 to 9 of this
Note 1.- This noise evaluation method includes: appendix.
a) noise certijication test and measurement conditions;
b) measurement of aeroplane and helicopter noise received
on the ground;
c) calculation of eflective perceived noise level jam
measured noise data; and
2. NOISE CERTIFICATION TEST AND
MEASUREMENT CONDITIONS
2.1 General
This section prescribes the conditions under which noise
d) reporting of data to the certificating authority and certification tests shall be conducted and the measurement
correcting measured data. procedures that shall be used.
Note 2.- The instructions and procedures given in the
method are clearly delineated to ensure ungormity during
compliance tests, and to permit comparison between tests of
various types of aircraft conducted in various geographical
locations.
Note 3.- A complete list of symbols and units, the mathematical
formulation of perceived noisiness, a procedure for
determining atmospheric attenuation of sound, and detailed
Note.- Many applications for a noise certificate involve
only minor changes to the aircraft type design. The resultant
changes in noise can often be established reliably without the
necessity of resorting to a complete test as outlined in this
appendix. For this reason certificating authorities are encouraged
to permit the use of appropriate "equivalent procedures".
Also, there are equivalent procedures that may be used in &N
certification tests, in the interest of reducing costs and providing
reliahle results Guidance material on the use of
ANNEX 16 - VOLUME I APP 2-1 24/11/05
Annex I6 - Environmental Protection Volume I
equivalent procedures in the noise certification of subsonic jet
and propellerdriven aeroplanes and helicopters is provided in
the Environmental Technical Manual on the Use of Procedures
in the Noise Certification of Aircraft (Doc 9501).
2.2 Test environment
2.2.1 Locations for measuring noise from an aircraft in
flight shall be surrounded hy relatively flat terrain having no
excessive sound absorption characteristics such as might be
caused by thick, matted or tall grass, shrubs or wooded areas.
No obstructions which significantly influence the sound field
from the aircraft shall exist within a conical space above the
point on the ground vertically below the microphone, the cone
being defined by an axis normal to the ground and by a
half-angle 80" from this axis.
Note.- Those people carrying out the measurements could
themselves constitute such obstructions.
2.2.2 Except as provided in 2.2.4, the tests shall be carried
out under the following atmospheric conditions:
a) no precipitation;
b) ambient air temperature not above 35°C and not below
-10°C and relative humidity not above 95 per cent and
not below 20 per cent over the whole noise path between
a point 10 m (33 ft) above the ground and the aircraft;
Note.- Care should be taken to ensure that the noise
measuring, aircraft flight path tracking and meteorological
instrumentation are operated within their
environmental limitations.
C) relative humidity and ambient temperature over the
whole noise path between a point 10 m (33 ft) above the
ground and the aircraft such that the sound attenuation
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