909
Federal Aviation Administration, DOT
§ 36.1
appendix B of this part (including use
of the applicable tradeoff provisions
specified in section B36.6).
(7) A ‘‘subsonic airplane’’ means an
airplane for which the maximum oper-
ating limit speed, M
mo
, does not exceed
a Mach number of 1.
(8) A ‘‘supersonic airplane’’ means an
airplane for which the maximum oper-
ating limit speed, M
mo
, exceeds a Mach
number of 1.
(9) A ‘‘Stage 4 noise level’’ means a
noise level at or below the Stage 4
noise limit prescribed in section
B36.5(d) of appendix B of this part.
(10) A ‘‘Stage 4 airplane’’ means an
airplane that has been shown under
this part not to exceed the Stage 4
noise limit prescribed in section
B36.5(d) of appendix B of this part.
(11) A ‘‘Chapter 4 noise level’’ means
a noise level at or below the maximum
noise level prescribed in Chapter 4,
Paragraph 4.4, Maximum Noise Levels,
of the International Civil Aviation Or-
ganization (ICAO) Annex 16, Volume I,
Amendment 7, effective March 21, 2002.
[Incorporated by reference, see § 36.6].
(g) For the purpose of showing com-
pliance with this part for transport
category large airplanes and jet air-
planes regardless of category, each air-
plane may not be identified as com-
plying with more than one stage or
configuration simultaneously.
(h) For the purpose of showing com-
pliance with this part, for helicopters
in the primary, normal, transport, and
restricted categories, the following
terms have the specified meanings:
(1)
Stage 1 noise level means a takeoff,
flyover, or approach noise level greater
than the Stage 2 noise limits pre-
scribed in section H36.305 of appendix H
of this part, or a flyover noise level
greater than the Stage 2 noise limits
prescribed in section J36.305 of appen-
dix J of this part.
(2)
Stage 1 helicopter means a heli-
copter that has not been shown under
this part to comply with the takeoff,
flyover, and approach noise levels re-
quired for Stage 2 helicopters as pre-
scribed in section H36.305 of appendix H
of this part, or a helicopter that has
not been shown under this part to com-
ply with the flyover noise level re-
quired for Stage 2 helicopters as pre-
scribed in section J36.305 of appendix J
of this part.
(3)
Stage 2 noise level means a takeoff,
flyover, or approach noise level at or
below the Stage 2 noise limits pre-
scribed in section H36.305 of appendix H
of this part, or a flyover noise level at
or below the Stage 2 limit prescribed in
section J36.305 of appendix J of this
part.
(4)
Stage 2 helicopter means a heli-
copter that has been shown under this
part to comply with Stage 2 noise lim-
its (including applicable tradeoffs) pre-
scribed in section H36.305 of appendix H
of this part, or a helicopter that has
been shown under this part to comply
with the Stage 2 noise limit prescribed
in section J36.305 of appendix J of this
part.
(5)
Maximum normal operating RPM
means the highest rotor speed cor-
responding to the airworthiness limit
imposed by the manufacturer and ap-
proved by the FAA. Where a tolerance
on the highest rotor speed is specified,
the maximum normal operating rotor
speed is the highest rotor speed for
which that tolerance is given. If the
rotor speed is automatically linked
with flight condition, the maximum
normal operating rotor speed cor-
responding with that flight condition
must be used during the noise certifi-
cation 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 must be used
during the noise certification proce-
dure.
(i) For the purpose of showing com-
pliance with this part for tiltrotors,
the following terms have the specified
meanings:
Airplane mode means a configuration
with nacelles on the down stops (axis
aligned horizontally) and rotor speed
set to cruise revolutions per minute
(RPM).
Airplane mode RPM means the lower
range of rotor rotational speed in RPM
defined for the airplane mode cruise
flight condition.
Fixed operation points mean des-
ignated nacelle angle positions selected
for airworthiness reference. These are
default positions used to refer to nor-
mal nacelle positioning operation of
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