preamble attached >>>
ADs updated daily at www.Tdata.com
PROPOSED AD BELL TEXTRON CANADA LIMITED: Docket No. FAA-2022-0807; Project Identifier AD-2022-00214-R.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    August 15, 2022.

(b) AFFECTED ADS

    This AD replaces AD 2021-26-08, Amendment 39-21867 (86 FR 72833, Decem
    -ber 23, 2021) (AD 2021-26-08).

(c) APPLICABILITY

    This  AD  applies  to  Bell Textron Canada Limited  Model  206,  206A,
    206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3 and 206L-4 helicopters, all
    serial numbers, certificated in any category.

Note 1 to paragraph (c):  Helicopters with an OH-58A designation are Model
206A-1 helicopters.

(d) SUBJECT

    Joint Aircraft Service Component (JASC) Code:  6510,  Tail Rotor Drive
    Shaft.

(e) UNSAFE CONDITION

    This AD was prompted by reports of cracked  or  missing nuts installed
    on the tail rotor drive shaft (TRDS) disc pack (Thomas) couplings. The
    FAA is issuing this AD to prevent failure or loss of a nut on the TRDS
    Thomas couplings. The unsafe condition, if not addressed, could result
    in  loss  of  the tail  rotor and  subsequent loss  of control  of the
    helicopter.

(f) COMPLIANCE

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

(g) REQUIREMENTS

    Except as specified in paragraphs (h) and (i) of this AD:  Comply with
    all  required  actions  and  compliance  times  specified  in,  and in
    accordance  with,  Transport Canada AD CF-2020-15,  dated May 13, 2020
    (Transport Canada AD CF-2020-15).

(h) EXCEPTIONS TO TRANSPORT CANADA AD CF-2020-15

(1) Where Transport Canada AD CF-2020-15  requires compliance  in terms of
    air time, this AD requires using hours time-in-service (TIS).

(2) Where Transport Canada AD CF-2020-15  refers  to  the  effective dates
    specified in paragraphs (h)(2)(i) and (ii)  of this AD,  this  AD  re-
    quires using the effective date of this AD.

(i) October 9, 2019 (the effective date of Transport Canada AD CF-2019-34,
    dated September 25, 2019).

(ii) The effective date of Transport Canada AD CF-2020-15.

(3) Where Transport Canada  AD CF-2020-15  defines  Group 1 helicopters as
    those  models  "that have not been modified by installing STC SH2750NM
    or STC SH99-202,"  replace  "that have not been modified by installing
    STC SH2750NM or STC SH99-202" with "that have not been modified by in-
    stalling STC SH2750NM."

(4) Where Transport Canada AD CF-2020-15  defines  Group 4 helicopters  as
    those  models  "that have been modified  by installing STC SH2750NM or
    STC SH99-202,"  replace  "that  have  been  modified by installing STC
    SH2750NM or STC SH99-202" with  "that have been modified by installing
    STC SH2750NM."

(5) Where Transport Canada AD CF-2020-15  requires  compliance  within 600
    hours air time or 24 months, whichever occurs first,  this AD requires
    compliance within 600 hours TIS only  and  does not allow a compliance
    time of 24 months.

(6) Where any paragraph of Transport Canada AD CF-2020-15 specifies to re-
    place part number (P/N) MS21042 nuts  with P/N NAS9926 nuts,  this  AD
    requires removing P/N MS21042 nuts from service and replacing with P/N
    NAS9926 nuts.

(7) Where any paragraph of any service information referenced in Transport
    Canada AD CF-2020-15  specifies to replace P/N MS21042L4 nuts with P/N
    90-132L4 nuts, this AD requires removing P/N MS21042L4 nuts from serv-
    ice and replacing with P/N 90-132L4 nuts,  in accordance with Air Comm
    Corporation Service Bulletin SB 206EC-092619, Revision NC,  dated Sep-
    tember 26, 2019 (SB 206EC-092619 Rev NC).

(8) Where any paragraph of any service information referenced in Transport
    Canada AD CF-2020-15  specifies to replace P/N MS21042L5 nuts with P/N
    90-132L5 nuts, this AD requires removing P/N MS21042L5 nuts from serv-
    ice and replacing with P/N 90-132L5 nuts, in accordance with SB 206EC-
    092619 Rev NC.

(9) Where any paragraph of any service information referenced in Transport
    Canada AD  CF-2020-15 specifies  if any  P/N MS21042L4  nuts are found
    loose or damaged, report at which location and provide the information
    to Product Support Engineering at productsupport@bellflight.com,  this
    AD requires  if any  P/N MS21042L4  nuts are  found loose  or damaged,
    before further flight, inspecting each TRDS Thomas coupling, including
    each bolt, nut, and washer,  for any elongated holes, fretting  on the
    fasteners,  and damaged  fasteners. If  there is  any elongated  hole,
    fretting  on the  fasteners, or  damaged fasteners,  this AD  requires
    before further flight,  removing from service  each affected part  and
    replacing it with an airworthy part.

(i) NO REPORTING REQUIREMENT

    Although the service information referenced in Transport Canada AD CF-
    2020-15 specifies  to submit certain information  to the manufacturer,
    this AD does not include that requirement.

(j) 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 (k)(2)  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.

(k) RELATED INFORMATION

(1) For Transport Canada AD CF-2020-15,  contact Transport Canada,  Trans-
    port  Canada  National  Aircraft  Certification,  159 Cleopatra Drive,
    Nepean, Ontario, K1A 0N5, CANADA;  telephone  888-663-3639;  email TC.
    AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca;  internet
    https://tc.canada.ca/en/aviation.  You  may  find the Transport Canada
    material on the Transport Canada  website  at https://tc.canada.ca/en/
    aviation. You may view this material 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.  This material may be found in the AD
    docket at https://www.regulations.gov  by  searching  for and locating
    Docket No. FAA-2022-0807.

(2) For more information about this AD,  contact  Matt Fuller,  AD Program
    Manager,  General Aviation & Rotorcraft Unit,  Airworthiness  Products
    Section,  Operational Safety Branch,  FAA,  10101 Hillwood Pkwy., Fort
    Worth, TX 76177;  telephone (817) 222-5110;  email matthew.fuller@faa.
    gov.

(3) For Air Comm Corporation service information  identified  in  this AD,
    contact Air Comm Corporation, 1575 West 124th Ave. #210,  Westminster,
    CO 80234; telephone (303) 440-4075;  email service@aircommcorp.com; or
    at https://www.aircommcorp.com. You may view this material 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.

Issued on June 23, 2022. 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 15,
2022.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39

[Docket No. FAA-2022-0807; Project Identifier AD-2022-00214-R]
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 supersede Airworthiness Directive (AD)
2021-26-08, which applies to certain Bell Textron Canada Limited Model
206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4
helicopters. AD 2021-26-08 requires removing certain nuts from service;
installing newly designed nuts; applying a specific torque, and a
torque stripe to each newly installed nut; after the installation of
each newly designed nut, inspecting the torque; and depending on the
inspection results, either applying a torque stripe, or performing
further inspections and removing certain parts from service. AD 2021-
26-08 also prohibits installing any affected nut on any tail rotor
drive shaft (TRDS) disc pack (Thomas) coupling. Since the FAA issued AD
2021-26-089, the FAA determined certain torque values and part numbers
(P/Ns) need to be revised. This proposed AD would require removing
certain nuts from service; installing newly designed nuts; applying
torque and a torque stripe; and
additional corrective actions if necessary. This proposed AD would also
prohibit installing any affected nut on any TRDS Thomas coupling, as
specified in a Transport Canada AD, which is proposed for incorporation
by reference (IBR). 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 15,
2022.

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 above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For Transport Canada material that is proposed for IBR in this
NPRM, contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario, K1A 0N5, CANADA;
telephone 888-663-3639; email TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca; internet https://tc.canada.ca/en/aviation.
You may find the Transport Canada material on the Transport
Canada website at https://tc.canada.ca/en/aviation. For Air Comm
Corporation service information identified in this NPRM, contact Air
Comm Corporation, 1575 West 124th Ave. #210, Westminster, CO 80234;
telephone (303) 440-4075; email service@aircommcorp.com; or at https://www.aircommcorp.com. For Bell service information identified in this
NPRM, contact Bell Textron Canada Limited, 12,800 Rue de l'Avenir,
Mirabel, Quebec J7J 1R4, Canada; telephone 1-450-437-2862 or 1-800-363-
8023; fax 1-450-433-0272; email productsupport@bellflight.com; or at
https://www.bellflight.com/support/contact-support. You may view this
material 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. The Transport Canada material is also available at https://
www.regulations.gov by searching for and locating Docket No. FAA-2022-
0807.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0807; 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: Matt Fuller, AD Program Manager,
General Aviation & Rotorcraft Unit, Airworthiness Products Section,
Operational Safety Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX
76177; telephone (817) 222-5110; email matthew.fuller@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-2022-0807; Project Identifier
AD-2022-00214-R'' 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 Matt
Fuller, AD Program Manager, General Aviation & Rotorcraft Unit,
Airworthiness Products Section, Operational Safety Branch, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177; telephone (817) 222-5110; email
matthew.fuller@faa.gov. Any commentary that the FAA receives that is
not specifically designated as CBI will be placed in the public docket
for this rulemaking.

Background

The FAA issued AD 2021-26-08, Amendment 39-21867 (86 FR 72833,
December 23, 2021) (AD 2021-26-08) for Bell Textron Canada Limited
Model 206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4
helicopters, with nut P/N MS21042L4 or P/N MS21042L5 installed on the
TRDS Thomas couplings. AD 2021-26-08 requires removing certain nuts
from service, installing newly designed nuts, and applying a specific
torque and a torque stripe to each newly installed nut. AD 2021-26-08
also requires, after the installation of each newly designed nut,
inspecting the torque and, depending on the inspection results, either
applying a torque stripe or performing further inspections and removing
certain parts from service. Finally, AD 2021-26-08 prohibits installing
any affected nut on any TRDS Thomas coupling. The FAA issued AD 2021-
26-08 to prevent failure or loss of a nut on any TRDS Thomas coupling.
AD 2021-26-08 was prompted by Transport Canada AD CF-2020-15, dated
May 13, 2020 (Transport Canada AD CF-2020-15). Transport Canada, which
is the aviation authority for Canada, issued Transport Canada AD CF-
2020-15 to correct an unsafe condition for Bell Textron Canada Limited
Model 206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4
helicopters, all serial numbers. Transport Canada AD CF-2020-15
specifies for certain model helicopters, newly designed nuts cannot be
installed because Supplemental Type Certificate (STC) SH2750NM and
Transport Canada STC SH99-202 install a pulley at the Thomas coupling
location causing insufficient clearance. Transport Canada advises, for
certain model helicopters with STC SH2750NM or Transport Canada STC
SH99-202 installed, different part-numbered nuts may be installed and
are now required to be replaced with a new part-numbered nut that is
not vulnerable to the unsafe condition.

Actions Since AD 2021-26-08 Was Issued

Since the FAA issued AD 2021-26-08, the FAA determined that certain
P/Ns and certain torque values in paragraph (g) of AD 2021-26-08 need
to be revised. The FAA advises that the 50-70 in lb torque values are
only applicable to certain bolts and nuts, and a 150-180 in lb torque
value is required for other bolts and nuts that are required to be
installed by this proposed AD. The FAA also advises that certain part-
numbered nuts that are required to be installed according to AD 2021-
26-08 need to be removed from service and replaced due to a certain
pulley configuration.
This proposed AD was prompted by reports of cracked or missing nuts
installed on the TRDS Thomas couplings. The FAA is proposing this AD to
prevent failure or loss of a nut on the TRDS Thomas couplings, which if
not addressed could result in loss of the tail rotor and subsequent
loss of control of the helicopter. See Transport Canada AD CF-2020-15
for additional background information.

Related Service Information Under 1 CFR Part 51

Transport Canada AD CF-2020-15 requires the replacement of certain
part-numbered nuts with newly designed nuts at each TRDS Thomas
coupling and prohibits installing any affected nut on any TRDS Thomas
coupling. The replacement includes applying torque, and a torque
stripe.
The FAA reviewed Air Comm Corporation Service Bulletin SB 206EC-
092619, Revision NC, dated September 26, 2019, which also specifies
procedures for replacing the affected nuts with the newly designed
corrosion-resistant nuts, but explains that affected helicopters
equipped with Air Comm Corporation air conditioning systems installed
under STC SH2750NM use the affected nut to attach a pulley onto the
TRDS, which causes clearance issues for the nuts to be installed at the
coupling. Therefore, this service bulletin specifies replacing the nut
with a lower profile nut.
This material 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.

Other Related Service Information

The FAA also reviewed Bell Alert Service Bulletin (ASB) 206-19-136,
dated August 27, 2019, for FAA-certificated Model 206, 206A-series, and
206B-series helicopters, and non FAA-certificated Model TH-67
helicopters; and Bell ASB 206L-19-181, dated August 27, 2019, and
Revision A, dated August 29, 2019, for Model 206L, 206L-1, 206L-3, and
206L-4 helicopters. This service information specifies procedures for
replacing the affected nuts with the newly designed corrosion-resistant
nuts. Revision A of Bell ASB 206L-19-181 corrects a typographical
error.
Additionally, the FAA reviewed Bell Service Instruction BHT-206-SI-
2052, Revision 1, dated October 14, 2010. This service information
specifies procedures to upgrade Model 206L-1 and 206L-3 helicopters to
allow operations at an increased internal gross weight.

Differences Between This Proposed AD and Transport Canada AD CF-2020-15

Transport Canada AD CF-2020-15 requires compliance with certain
actions within 600 hours air time or within the next 24 months,
whichever occurs first, whereas this proposed AD would require
compliance within 600 hours time-in-service only. Service information
referenced in Transport Canada AD CF-2020-15 specifies if any P/N
MS21042L4 nuts are found loose or damaged, reporting the location and
providing the information to Bell, whereas this proposed AD would
require if any P/N MS21042L4 nuts are found loose or damaged,
inspecting each TRDS Thomas coupling, including each bolt, nut, and
washer, for any elongated holes, fretting on the fasteners, and damaged
fasteners, and depending on the results of the inspection, removing
from service each affected part and replacing it with an airworthy
part.

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 these same type designs.

Proposed AD Requirements in This NPRM

This proposed AD would require accomplishing the actions specified
in Transport Canada AD CF-2020-15, described previously, as
incorporated by reference, except for any differences identified as
exceptions in the regulatory text of this proposed AD and except as
discussed under ``Differences Between this Proposed AD and Transport
Canada AD CF-2020-15.''

Explanation of Required Compliance Information

In the FAA's ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation
authority (CAA) ADs as the primary source of information for compliance
with requirements for corresponding FAA ADs. The FAA has been
coordinating this process with manufacturers and CAAs. As a result, the
FAA proposes to incorporate Transport Canada AD CF-2020-15 by reference
in the FAA final rule. This proposed AD would, therefore, require
compliance with Transport Canada AD CF-2020-15 in its entirety through
that incorporation, except for any differences identified as exceptions
in the regulatory text of this proposed AD. Using common terms that are
the same as the heading of a particular section in Transport Canada AD
CF-2020-15 does not mean that operators need comply only with that
section. For example, where the AD requirement refers to ``corrective
actions,'' compliance with this AD requirement is not limited to the
section titled ``Corrective Actions'' in Transport Canada AD CF-2020-
15. Service information referenced in Transport Canada AD CF-2020-15
for compliance will be available at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0807 after the FAA final
rule is published.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 1,359 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.
Replacing each affected nut with the newly designed nut and
applying torque and a torque stripe would take about 4 work-hours, and
parts would cost about $75 for an estimated cost of $415 per nut
replacement and $563,985 per nut replacement for the U.S. fleet.
In addition, the costs of the actions that are part of the required
replacement are as follows:
If required due to loose or damaged nuts found, inspecting each
TRDS Thomas coupling, and each bolt, nut, and washer for elongated
holes and fretting on the fasteners would take about 0.5 work-hour for
an estimated cost of $43 per inspection.

If required, replacing each TRDS Thomas coupling would take about 4
work-hours, and parts would cost about $4,000 for an estimated cost of
$4,340 per TRDS Thomas coupling replacement.
If required, replacing a bolt or washer would take a minimal amount
of time and parts would cost a nominal amount.

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 above, 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:

a. Removing Airworthiness Directive 2021-26-08, Amendment 39-21867 (86
FR 72833, December 23, 2021); and

b. Adding the following new airworthiness directive: