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PROPOSED AD BELL TEXTRON CANADA LIMITED: Docket No. FAA-2021-0497; Project Identifier 2019-SW-043-AD.
(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.

(e) UNSAFE CONDITION

    This  AD  was  prompted  by  three  reports  of  unexpected  forces or
    uncommanded inputs to the directional (yaw) control system. The FAA is
    issuing this AD to prevent yaw trim runaway.  The unsafe condition, if
    not addressed, could result in loss of control of the helicopter.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) REQUIRED ACTIONS

(1) Within 30 days after the effective date of this AD,  revise the exist-
    ing Rotorcraft Flight Manual for your helicopter as follows:

(i) In Section 2,  Normal  Procedures,  under  2-4.  INTERIOR AND PRESTART
    CHECK,  add  the  following as item 25:  "25. Depress the cyclic force
    TRIM REL button and collective FORCE REL button  (4-axis only) to cen-
    ter actuators and extinguish any active out of detent indications."

(ii) In Section 2, Normal Procedures, under 2-5. ENGINE START and under 2-
     8. TAKEOFF, add the following above item 1: "CAUTION: WHEN MANIPULAT-
     ING  FLIGHT CONTROLS  WITH FORCE  TRIM SELECTED  ON,  DO  NOT RELEASE
     AFFECTED  FLIGHT   CONTROL  UNTIL   THE  OUT   OF  DETENT  INDICATION
     EXTINGUISHES.  THE FLIGHT  CONTROLS MAY  BE RESET  BY DEPRESSING  THE
     CYCLIC FORCE TRIM REL BUTTON AND COLLECTIVE FORCE REL BUTTON  (4-AXIS
     ONLY) UNTIL THE OUT OF DETENT INDICATION EXTINGUISHES."

(iii) In Section 3, Emergency and Malfunction Procedures, under 3-9. AUTO-
      MATIC FLIGHT CONTROL SYSTEM, add the information in Figure 1 to para
      -graph (g)(1)(iii) of this AD as item 3-9-D:

                      FIGURE 1 TO PARAGRAPH (G)(1)(III)                   
    ______________________________________________________________________
    3-9-D. TRIM RUNAWAY

     INDICATIONS:

    Flight controls  Uncommanded movement.

    Flight control forces   High in axis of uncommanded movement,  normal
    in other axes.

    Out of detent indication for affected axis

     PROCEDURE:

    1. Cyclic force TRIM REL  and / or collective FORCE REL button (4-axis
       only)  Depress until the out of detent indication extinguishes.

    2. Flight controls   Do not release  flight control  if out of detent
       indication is present.

    3. Force TRIM switch  OFF; check TRM OFF illuminates on PFD.

    4. If IMC, land as soon as practical. If VMC, continue flight in SCAS.
    ______________________________________________________________________

(iv) In Section 4, Performance,  under 4-2. POWER ASSURANCE CHECK, add the
     following above  the instructions  for performing  a power  assurance
     check: "CAUTION:  WHEN MANIPULATING  FLIGHT CONTROLS  WITH FORCE TRIM
     SELECTED ON, DO NOT RELEASE AFFECTED FLIGHT CONTROL UNTIL THE OUT  OF
     DETENT INDICATION EXTINGUISHES. THE  FLIGHT CONTROLS MAY BE  RESET BY
     DEPRESSING THE CYCLIC FORCE TRIM REL BUTTON AND COLLECTIVE FORCE  REL
     BUTTON   (4-AXIS   ONLY)   UNTIL  THE   OUT   OF   DETENT  INDICATION
     EXTINGUISHES."

(2) Using a document with information identical to the information in para
    -graph (g)(1) of this AD is acceptable for compliance with the actions
    required by paragraph (g)(1) of this AD.

(3) The actions required by paragraphs (g)(1) and (2)  of  this  AD may be
    performed by the owner/operator (pilot) holding  at  least  a  private
    pilot certificate and must be entered  into the aircraft records show-
    ing compliance with this AD in accordance with Sec. 43.9(a)(1) through
    (4) and Sec. 91.417(a)(2)(v).  The  record  must  be maintained as re-
    quired by Sec. 91.417, Sec. 121.380, or Sec. 135.439.

(h) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, International Validation Branch,  FAA,  has the authority
    to approve AMOCs for this AD, if requested using the procedures  found
    in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to
    your principal inspector or local Flight Standards District Office, as
    appropriate. If  sending information  directly to  the manager  of the
    International  Validation  Branch, send  it  to the  attention  of the
    person identified in paragraph (i)(1)  of this AD. Information may  be
    emailed to: 9-AVS-AIR-730-AMOC@faa.gov. (2) Before using any  approved
    AMOC,  notify  your  appropriate  principal  inspector,  or  lacking a
    principal  inspector,  the  manager  of  the  local  flight  standards
    district office/certificate holding district office.

(i) RELATED INFORMATION

(1) For more information about this AD,  contact  Mitch Soth,  Flight Test
    Engineer, Southwest Section, Flight Test Branch, Compliance & Airworth
    -iness Division, FAA, 10101 Hillwood Pkwy, Fort Worth, TX 76177; tele-
    phone (817) 222-5110; email mitch.soth@faa.gov.

(2) The subject of this AD  is addressed  in Transport Canada Emergency AD
    CF-2019-16, dated May 6, 2019. You may view the Transport Canada AD on
    the internet  at https://www.regulations.gov  in  Docket No. FAA-2021-
    0497.

Issued on June 10, 2021. Ross Landes, Deputy Director for Regulatory Oper-
ations, Compliance & Airworthiness Division,  Aircraft Certification Serv-
ice.

DATES: The FAA must receive comments  on this  proposed AD  by  August 23,
2021.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0497; Project Identifier 2019-SW-043-AD]
RIN 2120-AA64

Airworthiness Directives; Bell Textron Canada Limited Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Bell Textron Canada Limited Model 429 helicopters. This
proposed AD was prompted by three reports of unexpected forces or
uncommanded inputs to the directional (yaw) control system. This
proposed AD would require revising the existing Rotorcraft Flight
Manual (RFM) for your helicopter. The FAA is proposing this AD to
address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by August 23,
2021.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:

Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the
instructions for submitting comments.

Fax: (202) 493-2251.

Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.

Hand Delivery: Deliver to Mail address between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this NPRM, contact Bell
Textron Canada Limited, 12,800 Rue de l'Avenir, Mirabel, Quebec J7J1R4,
Canada; telephone (450) 437-2862 or (800) 363-8023; fax (450) 433-0272;
or at https://www.bellcustomer.com. You may view this service
information at the FAA, Office of the Regional Counsel, Southwest
Region, 10101 Hillwood Pkwy., Room 6N-321, 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. FAA-2021-0497; 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: Mitch Soth, Flight Test Engineer,
Southwest Section, Flight Test Branch, Compliance & Airworthiness
Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone
(817) 222-5110; email mitch.soth@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. FAA-2021-0497; Project Identifier
2019-SW-043-AD" 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 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) 222-5110; 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 CF-2019-16, dated May 6, 2019
(Transport Canada AD CF-2019-16), 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-2019-16 requires
revising Bell RFM BHT-429-FM-1 by incorporating revision 14, dated
April 18, 2019.

FAA's Determination

These helicopters have been approved by the aviation authority of
Canada and are approved for operation in the United States. Pursuant to
the FAA's 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.

Related Service Information


The FAA reviewed Section 2--Normal Procedures, Section 3--Emergency
and Malfunction Procedures, and Section 4--Performance, of Bell RFM
BHT-429-FM-1, 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 re-setting 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, 2-5. ENGINE START, and 2-8. TAKEOFF;
Section 3, Emergency and Malfunction Procedures, under 3-9. AUTOMATIC
FLIGHT CONTROL SYSTEM; and Section 4, Performance, under 4-2. 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
work-hour 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 FAA's 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 Agency's 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 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 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

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

Sec. 39.13 [Amended]

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