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Federal Register / Vol. 86, No. 179 / Monday, September 20, 2021 / Proposed Rules
service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 222
5110.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210783; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the Transport Canada AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, Policy &
Innovation Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email rao.edupuganti@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210783; Project Identifier 2019SW009AD at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as
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private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, Policy & Innovation Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 222
5110; email rao.edupuganti@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.

Related Service Information Under 1
CFR Part 51
The FAA reviewed Figure 16. Fuel Operating Envelope Sheet 1 of 1, of Bell 505 Rotorcraft Flight Manual BHT
505FM1, Revision 3, dated July 25, 2018, which specifies limitations, normal and emergency procedures, performance data, weight and balance information, and provides a list of approved optional equipment supplements. This revision of the service information includes an updated figure of the fuel operating envelope showing the reduced pressure altitude limitations for Jet B and JP4 fuels.
This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.

Background
Proposed AD Requirements in This NPRM
This proposed AD would require revising the existing RFM for your helicopter by updating the fuel operating envelope figure to require reduced pressure altitude limitations for Jet B and JP4 fuels. Incorporating the RFM revision may be performed by the owner/operator pilot holding at least a private pilot certificate and must be entered into the aircraft records showing compliance with this AD in accordance with 14 CFR 43.9a1 through 4 and 14 CFR 91.417a2v. The record must be maintained as required by 14 CFR
91.417, 121.380, or 135.439. This is an exception to our standard maintenance regulations.

Transport Canada, which is the aviation authority for Canada, has issued Canadian AD CF201908, dated March 5, 2019 Canadian AD CF2019
08, to correct an unsafe condition for Bell Helicopter Textron Canada Limited Model 505 helicopters serial numbers 65011 and subsequent. Transport Canada advises of the need to reduce the altitude limitations for Jet B and JP
4 wide-cut fuels following unsatisfactory performance of the engine at the original higher altitude limitations with these wide-cut fuels.
This condition, if not addressed, could result in low fuel pressure, engine flame-out, or engine power interruption a change in any engine performance parameterincluding but not limited to gas generator speed, power turbine speed, main gas temperature, or output torqueoutside its normal limits for the prevailing operating conditions.
Accordingly, Canadian AD CF2019
08 requires revising the RFM to reflect the reduced altitude operating limitations for Jet B and JP4 wide-cut fuels.
FAAs Determination These helicopters have been approved by the aviation authority of Canada and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with Canada, Transport Canada, its technical representative, has notified the FAA of the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other helicopters of the same type design.

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Differences Between This Proposed AD
and the Transport Canada AD
Canadian AD CF201908 requires updating the RFM to Bell 505 RFM
BHT505FM1 Revision 3 or later revisions approved by Transport Canada, whereas this proposed AD
would require revising the Limitations Section of the RFM for your helicopter by replacing the existing Figure 16.
with Figure 16. Fuel Operating Envelope Sheet 1 of 1 of Bell 505 RFM
BHT505FM1, Revision 3, dated July 25, 2018.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 73
helicopters of U.S. Registry. Labor rates are estimated at $85 per work-hour.
Based on these numbers, the FAA
estimates the following costs to comply with this proposed AD.
Revising the existing RFM for your helicopter would take about 0.5 workhour for an estimated cost of $43 per helicopter or $3,139 for the U.S. fleet.

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