Code of Federal Regulations - Title 14

953

Federal Aviation Administration, DOT

Pt. 36, App. F

(f) The following airplane information

must be reported:

(1) Type, model and serial numbers (if any)

of airplanes, engines, and propellers.

(2) Any modifications or nonstandard

equipment likely to affect the noise charac-
teristics of the airplane.

(3) Maximum certificated takeoff weights.
(4) Airspeed in knots for each overflight of

the measuring point.

(5) Engine performance in terms of revolu-

tions per minute and other relevant param-
eters for each overflight.

(6) Aircraft height in feet determined by a

calibrated altimeter in the aircraft, ap-
proved photographic techniques, or approved
tracking facilities.

(g) Aircraft speed and position and engine

performance parameters must be recorded at
an approved sampling rate sufficient to en-
sure compliance with the test procedures and
conditions of this appendix.

Sec. F36.111 Flight procedures.

(a) Tests to demonstrate compliance with

the noise level requirements of this appendix
must include at least six level flights over
the measuring station at a height of 1,000

′

and

10 degrees from the zenith when

passing overhead.

(b) Each test over flight must be con-

ducted:

(1) At not less than the highest power in

the normal operating range provided in an
Airplane Flight Manual, or in any combina-
tion of approved manual material, approved
placard, or approved instrument markings;
and

(2) At stabilized speed with propellers syn-

chronized and with the airplane in cruise
configuration, except that if the speed at the
power setting prescribed in this paragraph
would exceed the maximum speed authorized
in level flight, accelerated flight is accept-
able.

PART C

—

DATA CORRECTION

Sec. F36.201 Correction of data.

(a) Noise data obtained when the tempera-

ture is outside the range of 68 degrees F.

degrees F., or the relative humidity is below
40 percent, must be corrected to 77 degrees F.
and 70 percent relative humidity by a meth-
od approved by the FAA.

(b) The performance correction prescribed

in paragraph (c) of this section must be used.
It must be determined by the method de-
scribed in this appendix, and must be added
algebraically to the measured value. It is
limited to 5dB(A).

computed by using the following formula:

R C

−

⎧

⎨

⎪

⎩⎪

⎫

⎬

⎪

⎭⎪

11 430

log

( ,

Where:

=Takeoff distance to 50 feet at maximum

certificated takeoff weight.

R/C=Certificated best rate of climb (fpm).
V

y=Speed for best rate of climb in the same

units as rate of climb.

(d) When takeoff distance to 50

′

is not list-

ed as approved performance information, the
figures of 2000 for single-engine airplanes and
1600

′

for multi-engine airplanes must be used.

Sec. F36.203

Validity of results.

(a) The test results must produce an aver-

age dB(A) and its 90 percent confidence lim-
its, the noise level being the arithmetic av-
erage of the corrected acoustical measure-
ments for all valid test runs over the meas-
uring point.

(b) The samples must be large enough to

establish statistically a 90 pecent confidence
limit not to exceed

1.5 dB(A). No test result

may be omitted from the averaging process,
unless omission is approved by the FAA.

PART D

—

NOISE LIMITS

Sec. F36.301 Aircraft noise limits.

(a) Compliance with this section must be

shown with noise data measured and cor-
rected as prescribed in Parts B and C of this
appendix.

(b) For airplanes for which application for

a type certificate is made on or after October
10, 1973, the noise level must not exceed 68
dB(A) up to and including aircraft weights of
1,320 pounds (600 kg.). For weights greater
than 1,320 pounds up to and including 3,630
pounds (1.650 kg.) the limit increases at the
rate of 1 dB/165 pounds (1 dB/75 kg.) to 82
dB(A) at 3,630 pounds, after which it is con-
stant at 82 dB(A). However, airplanes pro-
duced under type certificates covered by this
paragraph must also meet paragraph (d) of
this section for the original issuance of
standard airworthiness certificates or re-
stricted category airworthiness certificates
if those airplanes have not had flight time
before the date specified in that paragraph.

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