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PROPOSED AD LEONARDO S.P.A. (TYPE CERTIFICATE PREVIOUSLY HELD BY AGUSTA S.P.A.): Docket No. FAA-2020-0797; Product Identifier 2018-SW-081-AD.
(a) APPLICABILITY

    This AD applies to Leonardo S.p.a. Model AB139 and AW139  helicopters,
    certified in  any category,  with main  rotor (M/R)  rotating scissors
    with a lower half scissor spherical bearing (bearing) P/N 3G6230V00654
    installed.

(b) UNSAFE CONDITION

    This AD defines the unsafe condition as excessive play of the  bearing
    in the M/R rotating scissors.  This condition could result in  failure
    of the M/R rotating scissor bearing and loss of helicopter control.

(c) AFFECTED ADS

    This  AD  replaces  AD 2017-03-08,  Amendment 39-19102;  (82 FR 55752,
    November 24, 2017) ("AD 2017-23-08").

(d) COMMENTS DUE DATE

    The FAA must receive comments by October 30, 2020.

(e) COMPLIANCE

    You are  responsible for  performing each  action required  by this AD
    within  the  specified  compliance time  unless  it  has already  been
    accomplished prior to that time.

(f) REQUIRED ACTIONS

(1) Within 5 hours  time-in-service  (TIS)  after  December 11, 2017  (the
    effective  date of  AD 2017-23-08),  and thereafter  before the  first
    flight  of  each  day or  at intervals  not exceeding  24-clock hours,
    whichever occurs later:

(i) Using a magnifying glass and a flashlight, visually inspect each bear-
    ing for wear of the bearing liner. Some examples of wear are shown  in
    Figures 4 through 8  of Leonardo Helicopters Alert  Bollettino Tecnico
    No. 139-392,  Revision A,  dated February  14, 2017  (BT 139-392).  If
    there is  any wear  of the  liner, before  further flight, replace the
    bearing  with bearing  P/N 3G6230V00655  and install  special nut  P/N
    3G6230A06851.  Replacing  the bearing  with  bearing P/N  3G6230V00655
    constitutes terminating action  for the remaining  actions of this  AD
    for the bearing.

(ii) Inspect each bearing  for movement.  Refer to Figure 9 of BT 139-392.
     If the bearing moves freely  out of its seat, before  further flight,
     replace  the  rotating  scissor  attachment  flange  with  flange P/N
     3G6220A00633, replace the bearing  with bearing P/N 3G6230V00655  and
     install  special nut  P/N 3G6230A06851.  Replacing  the  bearing with
     bearing  P/N  3G6230V00655  constitutes  terminating  action  for the
     remaining actions of this AD for the bearing.

(iii) Inspect the M/R rotating scissors for play and wear of each bearing,
      paying particular  attention to  the bearing  staking condition,  by
      manually  moving  the  lower  half scissor  along  the  axis  of the
      spherical bearing. Refer to Figure 1 of BT 139-392. If there is  any
      play or wear beyond allowable limits, before further flight, replace
      the bearing with  bearing P/N 3G6230V00655  and install special  nut
      P/N   3G6230A06851.   Replacing  the   bearing   with  bearing   P/N
      3G6230V00655  constitutes  terminating  action  for  the   remaining
      actions of this AD for the bearing.

(2) Within 100 hours TIS after the effective date of this AD,  replace and
    torque each lower half scissor  nut with special nut P/N  3G6230A06851
    to  the  M/R  rotating  scissor  in  accordance  with  the  Compliance
    Instructions, Part II, steps 5.1 through 5.9 of BT 139-392, except you
    are not required to discard parts.

(3) Within 100 hours TIS after the effective date of this AD,  remove each
    bearing  P/N 3G6230V00654  from service and replace  with  bearing P/N
    3G230V00655.

(4) After December 11, 2017 (the effective date of AD 2017-23-08),  do not
    install on any helicopter any M/R rotating scissors with a bearing P/N
    3G6230V00654 installed.

(g) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, Rotorcraft Standards Branch,  FAA,  may approve AMOCs for
    this AD.  Send  your  proposal  to:  Matt Fuller,  AD Program Manager,
    Continued Operational  Safety Branch,  Airworthiness Products Section,
    General Aviation and Rotorcraft Unit, 10101 Hillwood Pkwy, Fort Worth,
    TX 76177;  telephone 817-222-5110;  email 9-ASW-FTW-AMOC-Requests@faa.
    gov.

(2) For operations conducted under a 14 CFR part 119 operating certificate
    or under 14 CFR part 91,  subpart K, the FAA suggests that  you notify
    your  principal  inspector,  or  lacking  a  principal  inspector, the
    manager of the local  flight standards district office  or certificate
    holding district office before  operating any aircraft complying  with
    this AD through an AMOC.

(h) ADDITIONAL INFORMATION

    The subject of this AD is addressed in European Aviation Safety Agency
    (now European Union Aviation Safety Agency) (EASA) AD No. 2017-0028-E,
    dated February 15, 2017.  You may view the EASA AD  on the internet at
    https://www.regulations.gov in the AD Docket.

(i) SUBJECT

    Joint Aircraft Service Component (JASC) Code: 6200, Main Rotor System.

Issued on September 9, 2020.  Lance T. Gant,  Director,  Compliance & Air-
worthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this proposed AD  by  October 30,
2020.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0797; Product Identifier 2018-SW-081-AD]
RIN 2120-AA64

Airworthiness Directives; Leonardo S.p.a. Helicopters (Type
Certificate Previously Held by Agusta S.p.A.)

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2017-23-08 for Agusta S.p.A. (now Leonardo S.p.a.) Model AB139 and
AW139 helicopters. AD 2017-23-08 requires repetitively inspecting the
main rotor (M/R) rotating scissors, removing certain lower half scissor
spherical bearings (bearings) from service, replacing the removed
bearings with a new bearing, and installing a special nut. Since the
FAA issued AD 2017-23-08, investigation results determined that a
quality control issue may have affected the production of the affected
bearings. This proposed AD would retain the requirements of AD 2017-23-
08 and require replacing each affected bearing with a certain part-
numbered bearing. The actions of this proposed AD are intended to
address an unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by October 30,
2020.

ADDRESSES: You may send comments by any of the following methods:

Federal eRulemaking Docket: Go to https://www.regulations.gov. Follow the
online instructions for sending your comments electronically.

Fax: 202-493-2251.

Mail: Send comments to the U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590-0001.

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

Examining the AD Docket

You may examine the AD docket on the internet at https://www.regulations.
gov by searching for and locating Docket No. FAA-2020-0797;
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 proposed AD, the European Aviation Safety Agency (now European
Union Aviation Safety Agency) (EASA) AD, any comments received and
other information. The street address for Docket Operations is listed
above. Comments will be available in the AD docket shortly after
receipt.

For service information identified in this proposed rule, contact
Leonardo S.p.a. Helicopters, Emanuele Bufano, Head of Airworthiness,
Viale G.Agusta 520, 21017 C.Costa di Samarate (Va) Italy; telephone
+39-0331-225074; fax +39-0331-229046; or at https://www.leonardocompany.
com/en/home. 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 FURTHER INFORMATION CONTACT: Matt Fuller, AD Program Manager,
Continued Operational Safety Branch, Airworthiness Products Section,
General Aviation and Rotorcraft Unit, 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 participate in this rulemaking by submitting
written comments, data, or views. The most helpful comments reference a
specific portion of the proposal, explain the reason for any
recommended change, and include supporting data. To ensure the docket
does not contain duplicate comments, commenters should send only one
copy of written comments, or if comments are filed electronically,
commenters should submit only one time.

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 file in the docket all comments received, as well
as a report summarizing each substantive public contact with FAA
personnel concerning this proposed rulemaking. Before acting on this
proposal, the FAA will consider all comments received on or before the
closing date for comments. The FAA will consider comments filed after
the comment period has closed if it is possible to do so without
incurring expense or delay. The FAA may change this proposal in light
of the comments received.

Confidential Business Information

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, Continued
Operational Safety Branch, Airworthiness Products Section, General
Aviation and Rotorcraft Unit, 10101 Hillwood Pkwy., Fort Worth, TX
76177; telephone 817-222-5110; email Matthew.Fuller@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.

Discussion

The FAA issued AD 2017-23-08, Amendment 39-19102 (82 FR 55752,
November 24, 2017) ("AD 2017-23-08") for Agusta S.p.A. (now Leonardo
S.p.a.) Model AB139 and AW139 helicopters. AD 2017-23-08 requires
repetitively inspecting the M/R rotating scissors, removing certain
bearings from service, installing a special nut and requires replacing
the removed bearings with certain part-numbered bearings.

AD 2017-23-08 was prompted by EASA Emergency AD (EAD) No. 2017-
0028-E, dated February 15, 2017 (EASA EAD 2017-0028-E) issued by EASA,
which is the Technical Agent for the Member States of the European
Union. EASA advised of a report of a dislodged bearing on an M/R
rotating scissor equipped with a certain special nut. EASA EAD 2017-
0028-E requires repetitive inspections of certain M/R rotating scissor
bearings, and depending on the findings, replacement of the bearing and
affected M/R parts. The EASA AD also requires replacement of certain
bearings as a terminating action for the repetitive inspections.
According to EASA, this condition, could result in failure of the M/R
rotating scissor bearing and subsequent loss of control of the
helicopter.

Actions Since AD 2017-23-08 Was Issued

Since the FAA issued AD 2017-23-08, investigation results by the
supplier of the bearings determined that a quality control issue may
have affected the production of bearing part number (P/N) 3G6230V00654.
Accordingly, this proposed AD retains the requirements of AD 2017-23-08
and proposes replacing bearing P/N 3G6230V00654 with P/N 3G6230V00655.

FAA's Determination

These helicopters have been approved by EASA and are approved for
operation in the United States. Pursuant to the FAA's bilateral
agreement with the European Union, EASA 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 an
unsafe condition is likely to exist or develop on other helicopters of
the same type design.

Differences Between This Proposed AD and the EASA AD

The EASA AD specifies some compliance times using calendar time,
whereas this proposed AD does not. The EASA AD requires reporting
information to Leonardo S.p.a. Product Support Engineering, whereas
this proposed AD does not.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Leonardo Helicopters Alert Bollettino Tecnico No.
139-392, Revision A, dated February 14, 2017. This service information
specifies repetitively inspecting the M/R rotating scissors to monitor
the bearings and replacing the bearing with a new part-numbered
bearing. This service info also specifies installing a special nut in
case of lower scissor bearing dislodging.

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.

Other Related Service Information

The FAA reviewed Leonardo Helicopters AW139 IETP Document Code AMP-
39-A-62-31-00-00A-31AC-A, Rotating control installation--Fixed
swashplate and rotating scissors--Detailed inspection, Issue 29, dated
July 31, 2017, which describes procedures for a detailed inspection of
the fixed swashplate and rotating scissors.

Proposed AD Requirements

This proposed AD would retain the repetitive inspection
requirements of AD 2017-23-08, and continue to require replacing the
bearing with an improved bearing, replacing the rotating scissor
attachment flange with a certain part-numbered rotating scissor
attachment flange, and replacing the nut with a certain part-numbered
special nut. This proposed AD would also require removing each bearing
P/N 3G6230V00654 from service and replacing it with bearing P/N
3G6230V00655 within 100 hours TIS.

Costs of Compliance

The FAA estimates that this proposed AD would affect 102
helicopters of U.S. Registry. The FAA estimates that operators may
incur the following costs in order to comply with this proposed AD.
Labor costs are estimated at $85 per work-hour.

Inspecting for bearing liner wear, seat movement, and play would
take about 1 work-hour for a cost of $85 per helicopter and $8,670 for
the U.S. fleet per inspection cycle.

Replacing a bearing would take about 2 work-hours and parts would
cost about $950 for a cost of $1,120 per bearing.

Replacing a rotating scissor attachment flange would take about
0.25 work-hours and parts would cost about $25,629 for a cost of
$25,650 per flange.

Installing two special nuts would take about 1 work-hour and parts
would cost about $755 for a cost of $840 per helicopter and $85,680 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. 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 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 (AD) 2017-23-08, Amendment 39-19102
(82 FR 55752, November 24, 2017); and

b. Adding the following new AD: