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correction should normally be made using a sensitivity curve
of PNLTM versus advancing blade tip Mach number; however,
the correction may be made using an alternative parameter, or
parameters, approved by the certificating authority.
Note 1.- If it is not possible to attain the reference value
of advancing blade tip Mach number or the agreed reference
noise correlating parametec then an extrapolation of the
sensitivity curve is permitted providing that the data cover a
range of values of the noise correlating parameter agreed by
the certificating authority between test and reference conditions.
The advancing blade tip Mach number or agreed noise
correlating parameter shall be computed from as measured
data. A separate curve of source noise versus advancing blade
tip Mach number or another agreed noise correlating parameter
shall be derived for each of the three certijcation
microphone locations, centre line, sideline left and sideline
right, defined relative to the direction offight on each test run.
B Start of transition to climb.
F End of noise certification take-off flight path.
KI Take-off flight path reference point.
K,', Kl" Associated noise measurement points (of
3-microphone array).
M End of noise certification take-off flight track.
N Point on ground vertically below start of
transition to climb.
T Start of noise certification take-off flight track,
point on ground vertically below A.
8.6.3 Overflight (see Figure A2-5)
Position Description
D Start of noise certification overflight flight path.
E End of noise certification overflight flight path.
Kz Overflight flight path reference point.
Kz', K$ Associated noise measurement points (of
3-microphone array).
Note 2.- When using advancing blade tip Mach number it R Start of noise certification overflight flight track.
should be computed using true airspeed, on-board outside air
temperature (OAT), and rotor speed. S End of noise certification overflight flight track.
2411 1/05 APP 2-24
Appendix 2 Annex 16 - Environmental Protection
8.6.4 Approach (see Figure A2-6)
Position Description
9. ADJUSTMENT OF AEROPLANE
FLIGHT TEST RESULTS
9.1 When certification test conditions are not identical to
Start of noise certification approach flight path. reference conditions,. a.u~-r o- uriatea diustments shall be made to
H position on approach path vertically above the measured noise data by the methods of this section.
approach flight path reference point.
Note.- Direrences between test and reference conditions
I End of noise certification approach flight path. result in dzfferences in the following:
J Touchdown.
4 Approach flight path reference point.
a) aeroplane flight path and velocity relative to measurement
point;
K3', K; Associated noise measurement points (of
3-microphone array).
0 Intersection of the approach path with the ground
plane.
P Start of noise certification approach flight track.
U Point on ground vertically below start of flare.
b) sound attenuation in air;
c) parameters affecting engine-noise generating mechanism.
9.1.1 Adjustments to the measured noise values, shall be
made by one of the methods described in 9.3 and 9.4 for
differences in the following:
a) attenuation of the noise along its path as affected by
"inverse square" and atmospheric attenuation;
b) duration of the noise as affected by distance and speed
of aeroplane relative to measuring point;
8.7 Flight path distance
Distance Unit Meaning
NK, metres Take-off measurement distance. The c) source noise emitted by engine as affected by the
distance ffom start of transition to climb relevant parameters;
to the take-off flight path reference point.
metres Take-offflight hack distance. The distance
over which the position of the helicopter is
to be recorded.
d) aeroplanelengine source noise as affected by large
differences between test and reference airspeeds. In
addition to the effect on duration, the effects of airspeed
on component noise sources can also become significant
and must be considered; for conventional aeroplane configurations,
when differences between test and reference
airspeeds exceed 28 km/h (1 5 kt) true airspeed, test data
Helicopter overflight height. The height
of the helicopter above the overflight
flight reference point.
metres
(fect)
andlor analysis approved by the certificating authority
Overjlight flight track distance. The shall be used to quantify effects of airspeed adjustment
distance over which the position of the
helicopter is to be recorded.
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