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noise evaluation measure designated as sound exposure level
(SEL), in A-weighted decibels, as described in Appendix 4.
11.6.3 Test conditions and procedures shall be closely
similar to reference conditions and procedures or the acoustic
data shall be adjusted, by the methods outlined m Appendix 4,
to the reference conditions and procedures specified in this
chapter.
11.6.4 During the test, flights shall be made in equal numbers
with tailwind and headwind components.
11.6.5 Adjustments for differences between test and reference
flight procedures shall not exceed 2.0 dB(A).
11 -6.6 During the test, the average rotor rpm shall not
vary from the normal maximum operating rpm by more than
*1.0 per cent during the 10 dB-down time period.
11.6.7 The helicopter airspeed shall not vary from the
reference airspeed appropriate to the flight demonstration as
described in Appendix 4 by more than *5 km/h (*3 kt)
throughout the 10 dB-down time period.
11.6.8 l h e helicopter shall fly within *loo from the
vertical above the reference track through the reference noise
rneasuren~ent position.
11.6.9 Tests shall be conducted at a helicopter mass not
less than 90 per cent of the relevant maximum certificated
mass and may be conducted at a mass not exceeding 105 per
cent of the relevant maximum certificated mass.
Note.- Guidance material on the use of equivalent
procedures is provided in the Environmental Technical Manual
on the Use of Procedures in the Noise Certification of Aircraft
(Doc 9501).
CHAPTER 12. SUPERSONIC AEROPLANES
12.1 Supersonic aeroplanes - application for
certificate of airworthiness for the prototype
accepted before 1 January 1975
12.1.1 The Standards of Chapter 2 of this Part, with the
exception of maximum noise levels specified in 2.4, shall be
applicable to all supersonic aeroplanes, including their derived
versions, in respect of which either the application for the
certificate of airworthiness for the prototype was accepted, or
another equivalent prescribed procedure was carried out by the
certificating authority, before 1 January 1975, and for which a
certificalc of airworthiness for Lhc individual aeroplane was
first issued after 26 November 198 1.
12.1.2 The maximum noise levels of those aeroplanes
covered by 12.1.1, when determined in accordance with the
noise evaluation method of Appendix 1, shall not exceed the
measured noise levels of the first certificated aeroplane of the
type.
12.2 Supersonic aeroplanes - application for
certificate of airworthiness for the prototype
accepted on or after 1 January 1975
Note.- Standards and Recommended Practices for these
aeroplanes are nor yet developed but rhe noise levels of Chapter
3 ofthis Part applicable to subsonic jet aeroplanes mql be
used as guidelines for- aervplanes for- tvirich the applicationfora
cert6cate of airworthiness for the proto0,pe was accepted,
or another eqtcivalent prescribed proceduve ulas carried out by
the certzjcating authority, on or afrer 1 January 1975.
ANNEX 16 - VOLUME I
CHAPTER 13. TILT-ROTOR AIRCRAFT
Note 1.- Standards and Recommended Practices for this
chapter are not yet developed. In the meantime, guidelines
provided in Attachment F may be used for noise certification
uf tilt-rotor aircraj for which a type certificate of airworthiness
was issued on or after 13 May 1998 and to provide data
for land-use planning purposes.
Note 2.- Development of these guidelines made extensive
use of the Chapter 8 noise certification Standards for helicopters,
where applicable.
ANNEX 16 - VOLUME I
PART Il. NOISE MEASUREMENT FOR
MONITORING PURPOSES
Note.- The fillowing Recommendation has been developed
to assist States that measure noise for monitoring purposes,
until such time as agreement on a single method can be
reached
Recommendation.- Where the measurement of aircraft
noise is made for monitoring purposes, the method of
Appendix 5 should be used.
Note.- These purposes are described as including:
monitoring compliance with and checking the effectiveness of
such noise abatement requirements as may have been established
for aircraft in flight or on the ground. An indication of
the degree of correlation between values obtained by the
method used for measuring noise for aircraft design purposes
and the method@) used for monitoring purposes would be
necessary.
ANNEX 16 - VOLUME I
PART 1'. ASSESSMENT OF AIRPORT NOISE
Note. - The following Recommendations have been developed
for the purpose of promoting international communication
between States that hove adopted a variety of methods
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