spaschal on DSK3GDR082PROD with CFR

Section 36.1

14 CFR Ch. I (1-1-19 Edition)

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 prescribed 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 appendix J of this part.
(2) Stage 1 helicopter means a helicopter that has not been shown under
this part to comply with the takeoff,
flyover, and approach noise levels required for Stage 2 helicopters as prescribed in section H36.305 of appendix H
of this part, or a helicopter that has
not been shown under this part to comply with the flyover noise level required for Stage 2 helicopters as prescribed 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 prescribed 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 helicopter that has been shown under this
part to comply with Stage 2 noise limits (including applicable tradeoffs) prescribed 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) A  - Stage 3 noise level -  means a
takeoff, flyover, or approach noise
level at or below the Stage 3 noise limits prescribed in section H36.305 of appendix H of this part, or a flyover noise
level at or below the Stage 3 noise
limit prescribed in section J36.305 of
appendix J of this part.
(6) A  - Stage 3 helicopter -  means a
helicopter that has been shown under
this part to comply with the Stage 3
noise limits (including applicable
tradeoffs) prescribed 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 3 noise
limit prescribed in section J36.305 of
appendix J of this part.

(7) Maximum normal operating RPM
means the highest rotor speed corresponding to the airworthiness limit
imposed by the manufacturer and approved 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 corresponding with the reference flight
condition must 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 reference conditions must be used during the noise
certification procedure.
(i) For the purpose of showing compliance 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 designated nacelle angle positions selected
for airworthiness reference. These are
default positions used to refer to normal nacelle positioning operation of
the aircraft. The nacelle angle is controlled by a self-centering switch.
When the nacelle angle is 0 degrees
(airplane mode) and the pilot moves
the nacelle switch upwards, the nacelles are programmed to automatically turn to the first default position
(for example, 60 degrees) where they
will stop. A second upward move of the
switch will tilt the nacelle to the second default position (for example, 75
degrees). Above the last default position, the nacelle angle can be set to
any angle up to approximately 95 degrees by moving the switch in the up or
down direction. The number and position of the fixed operation points may
vary on different tiltrotor configurations.

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12:50 Apr 30, 2019

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