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disposed at 150 m on both sides of the flight path
detined in the overflight reference procedure and
lying on a line through the flight path reference point.
c) Approach reference noise measurement points
1) a flight path reference point located on the ground
120 m (394 ft) vertically below the flight path defined
in the approach reference procedure (see 8.6.4). On
level ground, this corresponds to a position 1 140 m
h r r i the intersection of the 6.0" approach path with
the ground plane;
2) two other points on the ground symmetrically
disposed at 150 m on both sides of the flight path
defmed in the approach reference procedure and lying
on a line through the flight path reference point.
Note.- See Attachment H (Guidelines for Obtaining
Helicopter Noise Data for Land-use Planning Purposes) that
defines acceptable supplemental land-use planning (LUP) data
procedures.
ANNEX 16 - VOLUME I 11-8-1 24/11/05
Annex 16 - Environmental Protection Volume I
8.4 Maximum noise levels 8.5 Trade-offs
8.4.1 For helicopters specified in 8.1.2 and 8.1.3, the
maximum noise levels, when determined in accordance with
the noise evaluation method of Appendix 2, shall not exceed
the following:
8.4.1.1 For take-08 109 EPNdB for helicopters with
maximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
3 EPNdB per halving of mass down to 89 EPNdB after which
the limit is constant.
8.4.1.2 For overflight: 108 EPNdB for helicopters with
maximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
3 EPNdB per halving of mass down to 88 EPNdB after which
the limit is constant.
8.4.1.3 For approach: 110 EPNdB for helicopters with
rriaximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
-3 EPNdB per halving of mass down to 90 EPNdB after which
the limit is constant.
Note.- See Attachment A for equations for the calculation
of noise levels as afuncrion of take-of mass.
8.4.2 For helicopters specified In 8.1.4, the maximum
noise levcls, when dctcrmincd in accordance with the noise
evaluation method of Appendix 2, shall not exceed the
following:
8.4.2.1 For take-off 106 EPNdB for helicopters with
maximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
3 EPNdB per halving of mass down to 86 EPNdB after which
the limit is constant.
8.4.2.2 For overflight: 104 EPNdB for helicopters with
maximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
3 EPNdB per halving of mass down to 84 EPNdB after which
the limit is constant.
8.4.2.3 For approach: 109 EPNdB for helicopters with
maximum certificated take-off mass, at which the noise certification
is requested, of 80 000 kg and over and decreasing
linearly with the logarithm of the helicopter mass at a rate of
3 EPNdB per halving of mass down to 89 EPNdB after which
the limit is constant.
If the noise level limits are exceeded at one or two
measurement points:
a) the sum of excesses shall not be greater than 4 EPNdB;
b) any excess at any single point shall not be greater than
3 EPNdB; and
c) any excess shall be offset by corresponding reductions at
the other point or points.
8.6 Noise certification reference procedures
8.6.1 General conditions
8.6.1.1 The reference procedures shall comply with the
appropriate airworthiness requirements.
8.6.1.2 The reference procedures and flight paths shall be
approved by the certificating authority.
8.6.1.3 Except in conditions specified in 8.6.1.4, the
take-off, overflight and approach reference procedures shall
be those defined in 8.6.2, 8.6.3 and 8.6.4 respectively.
8.6.1.4 When it is shown by the applicant that the design
characteristics of the helicopter would prevent flight being
conducted in accordance with 8.6.2, 8.6.3 or 8.6.4, the
reference procedures shall:
a) depart from the reference procedures defined .in 8.6.2,
8.6.3 or 8.6.4 only to the extent demanded by those
design characteristics which make compliance with the
reference procedures impossible; and
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