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Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Notices West, Washington, DC 20591; telephone 202 2673565; email hua.he@faa.gov.
Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

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B. Availability of Rulemaking Documents An electronic copy of rulemaking documents may be obtained from the internet by 1. Searching the Federal eRulemaking Portal www.regulations.gov;
2. Visiting the FAAs Regulations and Policies web page at www.faa.gov/
regulations_policies or 3. Accessing the Government Printing Offices web page at www.GovInfo.gov.
Copies may also be obtained by sending a request to the Federal Aviation Administration, Office of Rulemaking, ARM1, 800 Independence Avenue SW, Washington, DC 20591, or by calling 202 2679680. Commenters must identify the docket or notice number of this rulemaking.
All documents the FAA considered in developing this proposed rule, including economic analyses and technical reports, may be accessed from the internet through the Federal eRulemaking Portal referenced in item 1 above.
The Proposed Noise Certification Basis In consideration of the foregoing, and under the authority of Title 49 of the United States Code, section 44715a, the Federal Aviation Administration proposes that the following standards and procedures apply as the noise certification basis of the Matternet M2
model aircraft.
All statutory references in this Rule of Particular Applicability rule refer to Title 49 of the United States Code. All regulatory references refer to Title 14 of the Code of Federal Regulations, part 21
or part 36 and its appendices, unless otherwise cited.
Noise Certification Requirements for the Matternet M2 Model Aircraft:
1 General: The requirements and limitations of 14 CFR 36.3 and 36.6
apply to the Matternet M2 model aircraft, except as described herein.
a Limitations Reference 36.5, as modified: Pursuant to 49 U.S.C.
44715b4, the noise level in this Rule of Particular Applicability rule has been determined to be as low as is economically reasonable, technologically practicable, and appropriate for this aircraft. No determination is made that these noise levels are or should be acceptable or unacceptable for operation at, into, or out of, any airport, landing or launch
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pad, community, or any other environment that may be impacted or is sensitive to noise.
b Acoustical Change Reference 36.9 as modified: If, after type certification using the requirements stated herein, the aircraft incorporates a change in type design, the changed design is subject to an acoustical change analysis and approval in accordance with 21.93b. After such change in design, the aircraft may not subsequently exceed the noise limits specified in this rule.
2 Noise Measurement Reference 36.801, as modified: The noise generated by the aircraft must be measured at the noise measuring point and under the test conditions prescribed in paragraphs 7 through 23 of this rule, or using an equivalent procedure approved by the FAA before testing.
Any procedure not approved by the FAA before a test is performed is subject to disapproval and may require the aircraft to be retested using an approved procedure.
3 Noise Evaluation Reference 36.803, as modified: The noise measurement data required by paragraph 2 of this rule must be obtained using the test procedures in paragraphs 7 through 23 of this rule, and:
a Corrected to the reference conditions contained in paragraphs 5
and 6 of this rule; and b Evaluated using the procedures in paragraphs 24 through 26 of this rule, or using an FAA-approved equivalent procedure. Any procedure not approved by the FAA before a test is performed is subject to disapproval and may require the aircraft to be retested using an approved procedure.
4 Noise Limits Reference 36.805, as modified: Compliance with the noise limits prescribed in paragraphs 28 and 29 of this rule must be shown for this aircraft for which application for issuance of a type certificate in the special class is made under part 21.
5 Reference ConditionsGeneral Reference part 36 appendix J, section J36.1, as modified: Paragraphs 6
through 29 of this rule prescribe the noise certification requirements for this aircraft including:
a The conditions under which each noise certification test must be conducted and the measurement procedure that must be used to measure the aircraft noise during the test;
b The procedures that must be used to correct the measured data to the reference conditions, and to calculate the noise evaluation quantity designated as the A-weighted Sound Exposure
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Level SEL, denoted by symbol LAE;
and c The noise limit with which compliance must be shown.
6 Reference ConditionsTest Reference part 36 appendix J, section J36.3, as modified:
a Meteorological ConditionsThe following are the noise certification reference atmospheric conditions that are assumed to exist from the surface to the aircraft altitude:
i. Sea level pressure of 2,116 pounds per square foot 76 centimeters of mercury;
ii. Ambient temperature of 77 degrees Fahrenheit 25 degrees Celsius;
iii. Relative humidity of 70 percent;
and iv. Zero wind.
b Reference test site. The reference test site is flat and without line-of-sight obstructions, including any area across the flight path that is long enough to encompass the 10 dB down points of the A-weighted time history.
c Level flyover reference profile. For UA, the reference flyover profile is a level flight, 250 feet 76.2 meters above ground level as measured at the noise measuring station. The reference flyover profile has a linear flight track and passes directly over the noise monitoring station. The applicable reference airspeed is stabilized and maintained throughout the measured portion of the flyover. Rotor speed is normal operating RPM throughout the 10 dB-down time interval. For UA, applicable reference airspeeds are:
i. Vmax 0.9VNE, where VNE is the never-exceed airspeed at empty weight.
ii. Vcruise VH, where VH is the maximum performance airspeed at maximum certificated takeoff weight MTOW, d Two series of flyover tests are required. Each series must be flown at the weight and applicable reference speed conditions as follows:
i. MTOW inclusive of payload and Vcruise; and ii. Empty weight no payload and Vmax.
7 Noise Measurement Procedures General Reference part 36, appendix J, section J36.101a as modified:
Paragraphs 8 through 10 of this rule prescribe the conditions under which the aircraft noise certification tests must be conducted, and the measurement procedures that must be used to measure the aircraft noise during each test.
8 Test site requirements Reference:
Part 36, appendix J, section J36.101b, as modified:
a The noise measuring station must be surrounded by terrain having no
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