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b) be approved by the certificating authority.
8.6.1.5 The reference procedures shall be established for
the following reference atmospheric conditions:
a) sea level atmospheric pressure of 1 013.25 hPa;
b) ambient air temperature of 2S°C, i.e. ISA + 10°C;
c) relative humidity of 70 per cent; and
d) zero wind.
8.6.1.6 In 8.6.2 c), 8.6.3.1 c) and 8.6.4 c), the maximum
normal operating rpm shall be taken as the highest rotor speed
for each reference procedure corresponding to the airworthiness
limit imposed by the manufacturer and approved by the certrficating
authority. Where a tolerance on the highest rotor speed
is specified, the maximum normal operating rotor speed shall
be taken as the highest rotor speed about which that tolerance
is given. If the rotor speed is automatically linked with flight
Part If - Chapter 8 Annex 16 - Environmental Protection
condition, the maximum normal operating rotor speed corresponding
with that flight condition shall be used during the
noise certification procedure. If rotor speed can be changed by
pilot action, the highest normal operating rotor speed specified
in the flight manual limitation section for power-on conditions
shall be used during the noise certification procedure.
8.6.2 Take-off reference procedure
The take-off reference flight procedure shall be established as
follows:
a) the helicopter shall be stabilized at the maximum takeoff
power corresponding to minimum installed engine(s)
specification power available for the reference ambient
conditions or gearbox torque limit, whichever is lower,
and along a path starting from a point located 500 m
prior to the flight path reference point, at 20 m (65 ft)
above the ground;
b) the best rate of climb speed, V, or the lowest approved
speed for the climb after take-off, whichever is the
greater, shall be maintained throughout the take-off
reference procedure;
c) the steady climb shall be made with the rotor speed
stabilized at the maximum normal operating rpm certificated
for take-off;
d) a constant take-off configuration selected by the applicant
shall be maintained throughout the take-off reference
procedure with the landing gear position consistent
with the airworthiness certification tests for establishing
the best rate of climb speed, Vy;
e) the mass of the helicopter shall be the maximum takeoff
mass at which noise certification is requested; and
f) the reference take-off path is defined as a straight line
segment inclined from the starting point (500 m prior
to the centre microphone location and 20 m (65 R)
above ground level) at an angle defined by best rate of
climb (BRC) and Vy for minimum specification engine
performance.
8.6.3 Overflight reference procedure
8.6.3.1 The overtlight reference procedure shall be established
as follows:
a) the helicopter shall be stabilized in level flight overhead
the flight path reference point at a height of 150 m
(492 ft);
b) a speed of 0.9 VH or 0.9 VNE or 0.45 VH + 120 km/h
(0.45 VH + 65 kt) or 0.45 VNE + 120 km/h (0.45 VNE +
65 kt), whichever is the least, shall be maintained
throughout the overflight reference procedure;
Note.- For noise cert~fication purposes, VH is
dejned as the airspeed in levelflighl obtained using the
torque corresponding to minimum engine installed, maximum
continuous power avaiIable,for sea level pressure
(1 013.25 hPa), 2J°C ambient conditions at the relevant
maximum certificated mass. VNE is dejned as the
not-to-exceed airworthiness airspeed imposed by the
manufacturer and approved by the certificating authority.
c) the overflight shall be made with the rotor speed stabilized
at the maximum normal operating rpm certificated
for level flight;
d) the hclicopter shall bc in thc cruisc configuration; and
e) the mass of the helicopter shall be the maximum
take-off mass at which noise certification is requested.
8.6.3.2 The value of VH andfor VNE used for noise
certification shall be quoted in the approved fight manual.
8.6.4 Approach reference
procedure
The approach reference procedure shall be established as
follows:
a) the helicopter shall be stabilized and following a 6.0"
approach path;
b) the approach shall be made at a stabilized airspeed equal
to the- best rate of climb speed, V, or the lowest
approved speed for the approach, whichever is the
greater, with power stabilized during the approach and
over the flight path reference point, and continued to a
normal touchdown;
c) thc approach shall be made with thc rotor spccd stabilized
　
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