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b) ambient air temperature of 2S°C, i.e. ISA + 10°C.
6.5 Test procedures
6.5.1 Either the test procedures described in 6.5.2 and
6.5.3 or equivalent test procedures approved by the certificating
authority shall be used.
6.5.2 Tests to demonstrate compliance with the maximum
noise levels of 6.3 shall consist of a series of level flights overhead
the measuring station at a height of
The aeroplane shall pass over the measuring point within *lo0
from the vertical.
6.5.3 Overflight shall be performed at the highest power
in the normal operating range: stabilized airspeed and with
the aeroplane in the cruise configuration.
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).
1. As amended. Available fiom the Central Off~ceo f the International
Electrotechnical Commission, 3 me de VaremM, Geneva, 2. This is normally indicated in the aeroplane flight manual and on
Switzerland. the flight instruments.
ANNEX 16 - VOLUME I 11-61 24/11/05
CHAPTER 7. PROPELLER-DRIVEN STOL AEROPLANES
Note.- Standards and Recommended Practices for this
chapter are not yet developed. In the meantime, guidelines
provided in Attachment B may be used for noise certijication
of propeller-driven STOL aeroplanes for which a certificate of
airworthiness for the individual aeroplane was Jirst issued on
or afrer I January 1976.
ANNEX 16 - VOLUME I
8.1 Applicability
CHAPTER 8. HELICOPTERS
8.3 Reference noise
measurement points
Note.-- See also Chapter 1, I. 9.
8.1.1 The Standards of thii chapter shall be applicable to
all helicopters for which 8.1.2, 8.1.3, and 8.1.4 apply, except
those designed exclusively for agricultural, fire fighting or
external load canying purposes.
8.1.2 For a helicopter for which the application for the
certificate of airworthiness for the prototype was accepted, or
another equivalent prescribed procedure was carried out by the
certificating authority, on or after 1 January 1985, except for
those helicopters specified in 8.1.4, the noise levels of 8.4.1
shall apply.
8.1.3 For a derived version of a helicopter for which the
application for a change of type design was accepted, or
another equivalent prescribed procedure was carried out by the
certificating authority, on or after 17 November 1988, except
for those helicopters specified in 8.1.4, the noise levels of
8.4.1 shall apply.
8.1.4 For all helicopters, including their derived versions,
for which the application for the certificate of airworthiness
for the prototype was accepted, or another equivalent prescribed
procedure was carried out by the certificating authority,
on or after 21 March 2002, the noise levels of 8.4.2 shall
apply-
8.1.5 Certification of helicopters which are capable of
canying external loads or external equipment shall be made
without such loads or equipment fitted.
Note.- Helicopters which comply with the Standard with
internal load may be excepted when carrying external load
or external equipment, if such operations are conducted at a
gross mass or with other operating parameters which are in
excess of those certificated for airworthiness with internal
louU5.
8.1.6 An applicant under 8.1.1 may alternatively elect to
show compliance with Chapter 11 instead of Chapter 8 if the
helicopter has a maximum certificated take-off mass of
.3 175 kg or less.
8.2 Noise evaluation measure
The noise evaluation measure shall be the effective perceived
noise level in EPNdB as described in Appendix 2.
A helicopter, when tested in accordance with these Standards,
shall not exceed the noise levels specified in 8.4 at the
following points:
a) Take-off reference noise measurement points
1) a flight path reference point located on the ground
vertically below the flight path defined in the
take-off reference procedure and 500 m horizontally
in the direction of flight from the point at which transition
to climbing flight is initiated in the reference
procedure (see 8.6.2);
2) two other points on the ground symmetrically disposed
at 150 m on both sides of the flight path
defined in the take-off reference procedure and
lying on a line through the flight path reference
point.
b) Overflight reference noise measurement points
1) a flight path reference point located on the ground
150 m (492 ft) vertically below the flight path defined
in the overflight reference procedure (see 8.6.3.1);
2) two other points on the ground symmetrically
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