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change in type design specifies that the aeroplane may
not be operated for a period of more than 90 days unless
compliance with the provisions of Annex 16, Volume I,
is shown for that change in type design. This applies
only to changes resulting fiom a required maintenance
action.
3.2 Noise measurements
3.2.1 Noise evaluation measure
The noise evaluation measure shall be the effective perceived
noise level in EPNdB as described in Appendix 2.
ANNEX 16 - VOLUME I 11-3-1 24/11/05
Annex 16 - Environmental Protection Volume I
3.3 Noise measurement points 3.4 Maximum noise levels
3.3.1 Reference noise measurement points
3.4.1 The maximum noise levels, when determined in
accordance with the noise evaluation method of A-vv.e ndix 2.
An aeroplane, when tested in accordance with these Standards, shall not exceed the following:
shall not exceed the noise levels specified in 3.4 at the
following points:
3.4.1.1 At the lateral full-power
a) lateral full-power reference noise measurement point reference noise measurement point
1) for jet-powered aeroplanes: the point on a line parallel
to and 450 m from the runway centre line, where the
noise level is a maximum during take-off;
2) for propeller-driven aeroplanes: the point on the
extended centre line of the runway 650 rn vertically
below the climb-out flight path at full take-off power,
as defined in 3.6.2. Until 19 March 2002, the requirement
for lateral noise in 3.3.1 a) 1) shall alternatively
be permitted;
N o t e . For aeroplanes speciJied in 3.1.1 b) and for
aeroplanes specGed in 3.1.1 c) for which the application
for a cerfiJcate of airworthiness for the proto9pe
was accepted before 19 March 2002, the lateral noise
requirement speciJed in 3.3.1 a) 1) is permitted as an
a!temative.
b) flyover reference noise measurement point: the point on
the extended centre line of the runway and at a distance
of 6.5 km from the start of roll;
103 EPNdB for aeroplanes with maximum certificated take-off
mass, at which the noise certification is requested, of
400 000 kg and over and decreasing linearly with the logarithm
of the mass down to 94 EPNdB at 35 000 kg, after which
the limit remains constant.
3.4.1.2 At jlyover reference
noise measurement point
a) Aeroplanes with two engines or less
101 EPNdB for aeroplanes with maximum certificated
take-off mass, at which the noise certification is
requested, of 385 000 kg and over and decreasing Linearly
with.the logarithm of the aeroplane mass at the rate of
4 EPNdB per halvitlg of mass down to 89 EPNdB, after
which the limit is constant.
b) Aeroplanes with three engines
c) approach reference noise measurement point: the point As a) but with 104 EPNdB for aeroplanes with maxion
the ground, on the extended centre line of the runway, mum certificated take-off mass of 385 000 kg and over.
2 000 m from the threshold. On level ground this corresponds
to a position 120 m (394 f?) vertically below the c) Aeroplanes with four engines or more
3" descent path originating from a point 300 m beyond
the threshold.
3.3.2 Test noise measurement points
3.3.2.1 If the test noise r~leasurenlent points are not
located at the reference noise measurement points, any corrections
for the difference in position shall be made in the same
manner as the corrections For the differences between test and
reference flight paths.
3.3.2.2 Sufficient lateral test noise measurement points
shall be used to demonstrate to the certificating authority that
the maximum noise level on the appropriate lateral line has
been clearly determined. For jet-powered aeroplanes simultaneous
measurements shall be made at one test noise measuremcnt
point at a symmetrical position on the other side of the
runway. In the case of propeller-driven aeroplanes, because of
their inherent asymmetry in lateral noise, simultaneous
measurements shall be made at each and every test noise
measurement point at a symmetrical position (within *10 m
parallel with the axis of the runway) on the opposite side of the
runway.
As a) but with 106 EPNdB for aeroplanes with maximum
certificated take-off mass of 385 000 kg and over.
3.4.1.3 Af approach reference
noise measurement point
105 EPNdB for aeroplanes with maximum certificated take-off
mass, at which the noise certification is requested, of
280 000 kg or over, and decreasing linearly with the logarithm
of the mass down to 98 EPNdB at 35 000 kg, after which the
limit remains constant.
Note.- See Attachment A for equations for the calculation
of noise levels as afunction of take-oflmass.
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