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Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as 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 Mitch Soth, Flight Test Engineer, Southwest Section, Flight Test Branch, Compliance &
Airworthiness Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email mitch.soth@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.
Background Transport Canada, which is the aviation authority for Canada, has issued Transport Canada Emergency AD
CF201916, dated May 6, 2019
Transport Canada AD CF201916, to correct an unsafe condition for Bell Helicopter Textron Canada Limited now Bell Textron Canada Limited Model 429 helicopters, serial numbers 57001 and subsequent. Transport Canada advises of three reports of unexpected forces or uncommanded inputs to the directional yaw control system during ground operations.
Investigation revealed that a yaw trim runaway can occur while the automatic pedal trim function is operating. This condition, if not addressed, could result in loss of control of the helicopter.
Accordingly, Transport Canada AD CF
201916 requires revising Bell RFM
BHT429FM1 by incorporating revision 14, dated April 18, 2019.

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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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Related Service Information The FAA reviewed Section 2Normal Procedures, Section 3Emergency and Malfunction Procedures, and Section 4Performance, of Bell RFM BHT429
FM1, Revision 14, dated April 18, 2019. This revision of the service information adds a procedure to reduce the risk of trim runaway during start sequence, cautions to reduce the risk of uncommanded control movement during engine start and takeoff and resetting force trim detent instructions during engine start and takeoff, and an emergency procedure to assist flight crew to recognize trim runaway and response instructions.
Proposed AD Requirements in This NPRM
This proposed AD would require revising the existing RFM for your helicopter by adding procedures in Section 2, Normal Procedures, under 2
4. INTERIOR AND PRESTART CHECK, 25. ENGINE START, and 28.
TAKEOFF; Section 3, Emergency and Malfunction Procedures, under 39.
AUTOMATIC FLIGHT CONTROL
SYSTEM; and Section 4, Performance, under 42. POWER ASSURANCE
CHECK.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 120
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 0.50 workhour for an estimated cost of $43 per helicopter and $5,160 for the U.S. fleet.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or
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develop on products identified in this rulemaking action.
Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed, I certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Bell Textron Canada Limited: Docket No.
FAA20210497; Project Identifier 2019SW043AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by August 23, 2021.
b Affected ADs None.
c Applicability This AD applies to Bell Textron Canada Limited Model 429 helicopters, certificated in any category, serial numbers 57001 and subsequent.
d Subject Joint Aircraft Service Component JASC
Code: 6720, Tail Rotor Control System.

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