Pt. 36, App. B

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

A36.9.6 FLIGHT PATH DISTANCES - Continued
Distance

Unit

Meaning

OP .......

Feet (meters)

Approach flight track distance. The
distance from the runway threshold to the approach flight track
position along the extended center line of the runway after which
the position of the airplane need
no longer be recorded.

[Amdt. 36-54, 67 FR 45212, July 8, 2002; Amdt.
36-24, 67 FR 63195, 63196, Oct. 10, 2002; 68 FR
1512, Jan. 10, 2003; Amdt. 36-26, 70 FR 38749,
July 5, 2005; FAA Doc. No. FAA-2015-3782,
Amdt. No. 36-31, 82 FR 46131, Oct. 4, 2017]

APPENDIX B TO PART 36 - NOISE LEVELS
FOR TRANSPORT CATEGORY AND JET
AIRPLANES UNDER Section 36.103
Sec.
B36.1 Noise Measurement and Evaluation.
B36.2 Noise Evaluation Metric.
B36.3 Reference Noise Measurement Points.
B36.4 Test Noise Measurement Points.
B36.5 Maximum Noise Levels.
B36.6 Trade-Offs.
B36.7 Noise Certification Reference Procedures
and Conditions.
B36.8 Noise Certification Test Procedures.
Section B36.1 Noise measurement and evaluation
(a) The procedures of Appendix A of this
part, or approved equivalent procedures,
must be used to determine noise levels of an
airplane. These noise levels must be used to
show compliance with the requirements of
this appendix.
(b) For Stage 4 airplanes, an acceptable alternative to paragraph (a) of this section for
noise measurement and evaluation is Appendix 2 to ICAO Annex 16, Volume I, Amendment 7 (Incorporated by reference, see Section 36.6).
(c) For Stage 5 airplanes, an acceptable alternative to paragraph (a) of this section for
noise measurement and evaluation is Appendix 2 to ICAO Annex 16, Volume 1, Amendment 11-B (Incorporated by reference, see
Section 36.6).
Section B36.2 Noise Evaluation Metric
The noise evaluation metric is the effective perceived noise level expressed in
EPNdB, as calculated using the procedures of
appendix A of this part.

spaschal on DSK3GDR082PROD with CFR

Section B36.3 Reference Noise Measurement
Points
When tested using the procedures of this
part, except as provided in section B36.6, an
airplane may not exceed the noise levels
specified in section B36.5 at the following
points on level terrain:

(a) Lateral full-power reference noise
measurement point:
(1) For jet airplanes: The point on a line
parallel to and 1,476 feet (450 m) from the
runway centerline, or extended centerline,
where the noise level after lift-off is at a
maximum during takeoff. For the purpose of
showing compliance with Stage 1 or Stage 2
noise limits for an airplane powered by more
than three jet engines, the distance from the
runway centerline must be 0.35 nautical
miles (648 m). For jet airplanes, when approved by the FAA, the maximum lateral
noise at takeoff thrust may be assumed to
occur at the point (or its approved equivalent) along the extended centerline of the
runway where the airplane reaches 985 feet
(300 meters) altitude above ground level. A
height of 1427 feet (435 meters) may be assumed for Stage 1 or Stage 2 four engine airplanes. The altitude of the airplane as it
passes the noise measurement points must
be within + 328 to Section164 feet (+100 to Section50 meters) of the target altitude. For airplanes
powered by other than jet engines, the altitude for maximum lateral noise must be determined experimentally.
(2) For propeller-driven airplanes: The
point on the extended centerline of the runway above which the airplane, at full takeoff
power, reaches a height of 2,133 feet (650 meters). For tests conducted before August 7,
2002, an applicant may use the measurement
point specified in section B36.3(a)(1) as an alternative.
(b) Flyover reference noise measurement
point: The point on the extended centerline
of the runway that is 21,325 feet (6,500 m)
from the start of the takeoff roll;
(c) Approach reference noise measurement
point: The point on the extended centerline
of the runway that is 6,562 feet (2,000 m) from
the runway threshold. On level ground, this
corresponds to a position that is 394 feet (120
m) vertically below the 3Section descent path,
which originates at a point on the runway
984 feet (300 m) beyond the threshold.
Section B36.4 Test noise measurement points.
(a) If the test noise measurement points
are not located at the reference noise measurement points, any corrections for the difference in position are to be made using the
same adjustment procedures as for the differences between test and reference flight
paths.
(b) The applicant must use a sufficient
number of lateral test noise measurement
points to demonstrate to the FAA that the
maximum noise level on the appropriate lateral line has been determined. For jet airplanes, simultaneous measurements must be
made at one test noise measurement point at
its symmetrical point on the other side of
the runway. Propeller-driven airplanes have
an inherent asymmetry in lateral noise.
Therefore, simultaneous measurements must

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