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2021-18-10 BELL TEXTRON CANADA LIMITED: Amendment 39-21711; Docket No. FAA-2021-0497; Project Identifier 2019-SW-043-AD.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective October 12, 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 center actuat-
    ors 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 EXTINGUISH
     -ES.  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
      paragraph (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 in-
    spector, 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.

(j) MATERIAL INCORPORATED BY REFERENCE

    None.

Issued on August 26, 2021. Gaetano A. Sciortino, Deputy Director for Stra-
tegic Initiatives,  Compliance & Airworthiness Division, Aircraft Certifi-
cation Service.

FOR FURTHER INFORMATION CONTACT:  Mitch Soth, Flight Test Engineer, South-
west Section, Flight Test Branch, Compliance & Airworthiness Division, FAA
10101 Hillwood Pkwy, Fort Worth, TX 76177; telephone (817) 222-5110; email
mitch.soth@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2021-0497; Project Identifier 2019-SW-043-AD; Amendment
39-21711; AD 2021-18-10]
RIN 2120-AA64

Airworthiness Directives; Bell Textron Canada Limited Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

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

DATES: This AD is effective October 12, 2021.

ADDRESSES: For service information identified in this final rule,
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 the
referenced 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 final rule, the
Transport Canada AD, any comments received, and other information. The
street address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.

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:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to Bell Textron Canada
Limited Model 429 helicopters, serial numbers 57001 and subsequent. The
NPRM published in the Federal Register on July 7, 2021 (86 FR 35692).
In the NPRM, the FAA proposed to 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. The owner/operator (pilot) may revise the
existing RFM for your helicopter, and the owner/operator must enter
compliance with the applicable paragraphs of the AD into the aircraft
records in accordance with Sec. 43.9(a)(1) through (4) and Sec.
91.417(a)(2)(v). This is an exception to the FAA's standard maintenance
regulations.
The NPRM was prompted by Transport Canada Emergency AD CF-2019-16,
dated May 6, 2019 (Transport Canada AD CF-2019-16), issued by Transport
Canada, which is the aviation authority for Canada 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.

Discussion of Final Airworthiness Directive


Comments

The FAA received one comment from an individual who supported the
NPRM without change.

Conclusion

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 reviewed the relevant data, considered the
comment received, and determined that air safety requires adopting this
AD as proposed. Accordingly, the FAA is issuing this AD to address the
unsafe condition on these helicopters.

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.

Costs of Compliance

The FAA estimates that this AD affects 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 AD.
Revising the existing RFM for your helicopter takes 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 helicopters identified in this rulemaking action.

Regulatory Findings

This AD will not have federalism implications under Executive Order
13132. This AD will 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 above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will 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 Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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: