Document ID: FAA-2020-0912-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: Airbus Helicopters
Posted Date: 2020-10-14T04:00Z

[Federal Register Volume 85, Number 199 (Wednesday, October 14, 2020)]
[Proposed Rules]
[Pages 64995-64997]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-22504]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0912; Product Identifier 2015-SW-071-AD]
RIN 2120-AA64

Airworthiness Directives; Airbus Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to supersede airworthiness directive (AD) 82-
20-05 for Societe Nationale Industrielle Aerospatiale (now Airbus 
Helicopters) Model AS-350 and AS-355 series helicopters. AD 82-20-05 
requires inspecting and establishing a life limit for the tail rotor 
(TR) drive shaft bearing (bearing). Since the FAA issued AD 82-20-05, 
inconsistencies have been identified between inspections and 
maintenance actions required by ADs and inspections and maintenance 
actions specified in the applicable maintenance manual. This proposed 
AD would require replacing certain part-numbered TR bearings with one 
part-numbered bearing and repetitively inspecting one 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 November 
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-
0912; 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 
Airbus Helicopters, 2701 N. Forum Drive, Grand Prairie, TX 75052; 
telephone 972-641-0000 or 800-232-0323; fax 972-641-3775; or at https://www.airbus.com/helicopters/services/technical-support.html. 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: David Hatfield, Aviation Safety 
Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 
10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817-222-5116; 
email david.hatfield@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 as described in the

[[Page 64996]]

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 David Hatfield, Aviation Safety Engineer, Safety 
Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood 
Pkwy., Fort Worth, TX 76177; telephone: 817-222-5116; email 
david.hatfield@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 82-20-05, Amendment 39-4466 (47 FR 43018, 
September 30, 1982) (``AD 82-20-05'') for Societe Nationale 
Industrielle Aerospatiale (now Airbus Helicopters) Model AS-350 and AS-
355 series helicopters. AD 82-20-05 requires repetitively inspecting 
bearing part number (P/N) SKF 6007-2RS1MT47CA and P/N AS704A33.651.010 
to determine if the perpendicularity of the bearing relative to the 
shaft is within certain limits. AD 82-20-05 also establishes a life 
limit of 1,200 hours time-in-service (TIS) for the bearing and rubber 
sleeve.
    AD 82-20-05 was prompted by reports of four accidents due to 
failure of the drive shaft on Aerospatiale (now Airbus Helicopters) AS-
350 helicopters, and the resulting corrective actions required through 
ADs issued by the French Airworthiness Authority. The actions in AD 82-
20-05 are intended to prevent failure or seizure of a bearing.

Actions Since AD 82-20-05 Was Issued

    Since the FAA issued AD 82-20-05, EASA, which is the Technical 
Agent for the Member States of the European Union, issued EASA AD No. 
2015-0195, dated September 23, 2015 (EASA AD 2015-0195), to correct an 
unsafe condition for Airbus Helicopters Model AS 350 B, BA, BB, B1, B2, 
B3, and D, and AS 355 E, F, F1, F2, N, and NP helicopters with certain 
part-numbered bearings installed. EASA advises that after 
inconsistencies were identified between inspections and maintenance 
actions required by French Civil Aviation Authority ADs and EASA ADs, 
Airbus Helicopters issued service information to specify replacing four 
different part-numbered bearings with one bearing P/N 593404 (also 
listed as manufacturer part number (MP/N) 704A33-651-181) and to 
provide inspection procedures for the new bearing. Accordingly, EASA AD 
2015-0195 retains the inspections for the older design bearings, 
requires replacing the bearings with the new bearings, and requires 
repetitive inspections for the new bearings.

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 about 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 products of the 
same type designs.

Related Service Information

    The FAA reviewed Airbus Helicopters Alert Service Bulletin (ASB) 
No. AS355-01.00.57, Revision 2, dated January 19, 2016, for Model AS355 
helicopters, and ASB AS350-01.00.70, Revision 1, dated September 21, 
2015, for Model AS350 helicopters. The service information describes 
procedures for inspecting bearing P/N 593404 or MP/N 704A33-651-181 for 
position, condition, and wear. This service information also advises 
customers that older designed bearings are not fit for flight, and 
specifies replacing the older designed bearings with new bearing P/N 
593404 or MP/N 704A33-651-181. This service information also references 
procedures for repetitively inspecting the newer bearings.

Proposed AD Requirements

    This proposed AD would require within 100 hours TIS, and thereafter 
at intervals not to exceed 165 hours TIS, for helicopters with bearing 
P/N 593404 or MP/N 704A33-651-181 installed, inspecting each bearing 
holder damper bushing for wear, a crack, tears, and play between each 
bushing and support plate. This proposed AD would require inspecting 
each bearing holder for a crack, fretting, and corrosion around the 
attachment holes. This proposed AD would also require inspecting each 
rubber sleeve for rotation, crazing, play between the inner races and 
the rubber sleeve, and lack of integrity of the elastomer. Depending on 
the inspection results, this proposed AD would require removing certain 
parts from service. This proposed AD would also require, within 100 
hours TIS, making a mark with white paint on the rubber sleeves and on 
the shaft, and for helicopters with affected TR drive shaft bearings P/
N 6007-2RS1MT47CA, P9107NPP7, 83A851BC3, or 83A851B-1C3, or MP/N 
704A33-651-010, 704A33-651-111, or 704A33-651-143 installed, removing 
the affected bearings from service and replacing with bearing P/N 
593404 or MP/N 704A33-651-181. This proposed AD would prohibit 
installing certain bearings on any helicopter.

Differences Between This Proposed AD and the EASA AD

    The EASA AD requires replacing the older design bearings within 10 
months, while this proposed AD would require replacing the bearings 
within 100 hours TIS. The EASA AD applies to Model AS350BB helicopters; 
this proposed AD would not as this model helicopter is not FAA type-
certificated. Finally, this proposed AD would apply to Model AS350C and 
AS350D1 helicopters as they have the same bearings installed, and the 
EASA AD does not.

Costs of Compliance

    The FAA estimates that this proposed AD would affect 915 
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.
    For Model AS350 B, BA, B1, B2, B3, and C helicopters, inspecting 
the bearings would take about 2.5 work-

[[Page 64997]]

hours, for an estimated cost of $213 per helicopter per inspection 
cycle.
    Replacing each bearing with a single part-numbered bearing would 
take about 2.5 work-hours and parts would cost about $1,225, for a cost 
of $1,438 per helicopter.
    For Model AS350 D, D1, and AS355-series helicopters, inspecting the 
bearings would take about 3 work-hours, for a cost of $255 per 
helicopter per inspection cycle.
    Replacing each bearing with a single part-numbered bearing would 
take about 3 work-hours and parts would cost about $1,470, for a cost 
of $1,725 per helicopter.
    Making a mark with white paint on the rubber sleeves and shaft 
would take a minimal amount of time and have a nominal parts cost.

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

0
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]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive (AD) 82-20-05, Amendment 39-4466 
(47 FR 43018, September 30, 1982); and
0
b. Adding the following new AD:

Airbus Helicopters: Docket No. FAA-2020-0912; Product Identifier 
2015-SW-071-AD.

(a) Applicability

    This AD applies to Airbus Helicopters Model AS350B, AS350B1, 
AS350B2, AS350B3, AS350BA, AS350C, AS350D, AS350D1, AS355E, AS355F, 
AS355F1, AS355F2, AS355N, and AS355NP helicopters, certificated in 
any category, with a tail rotor (TR) drive shaft bearing (bearing) 
part number (P/N) 593404, 6007-2RS1MT47CA, P9107NPP7, 83A851BC3, or 
83A851B-1C3, or manufacturer part number (MP/N) 704A33-651-010, 
704A33-651-111, 704A33-651-143, or 704A33-651-181, installed.

(b) Unsafe Condition

    This AD defines the unsafe condition as failure or seizure of a 
TR bearing, which if not corrected could result in loss of the TR 
drive and subsequent loss of control of the helicopter.

(c) Affected ADs

    This AD supersedes AD 82-20-05, Amendment 39-4466 (47 FR 43018, 
September 30, 1982).

(d) Comments Due Date

    The FAA must receive comments by November 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) For helicopters with TR bearing P/N 593404 or MP/N 704A33-
651-181 installed, within 100 hours time-in-service (TIS) and 
thereafter at intervals not to exceed 165 hours TIS:
    (i) Inspect each bearing holder damper bushing for wear, a 
crack, tears, and play between each bushing and support plate. If 
there is any wear, a crack, tears, or play between the bushing and 
support plate, remove the bearing holder damper bushing from 
service.
    (ii) Inspect each bearing holder for a crack, fretting, and 
corrosion around the attachment holes. If there is a crack, 
fretting, or corrosion, remove the bearing holder from service.
    (iii) Inspect each rubber sleeve for rotation, crazing, play 
between the inner races and the rubber sleeve, and lack of integrity 
of the elastomer. For the purposes of this inspection, lack of 
integrity may be indicated by brittle or cracked rubber. If there is 
any rotation, crazing, play between the inner races and the rubber 
sleeve, or lack of integrity of the elastomer, remove the rubber 
sleeve from service.
    (2) Within 100 hours TIS:
    (i) Make a mark with white paint on the rubber sleeves and on 
the shaft.
    (ii) For helicopters with affected TR drive shaft bearings P/N 
6007-2RS1MT47CA, P9107NPP7, 83A851BC3, or 83A851B-1C3, or MP/N 
704A33-651-010, 704A33-651-111, or 704A33-651-143 installed, remove 
the affected bearings from service and replace with bearing P/N 
593404 or MP/N 704A33-651-181.
    (3) After the effective date of this AD, do not install bearing 
P/N 6007-2RS1MT47CA, P9107NPP7, 83A851BC3, or 83A851B-1C3, or MP/N 
704A33-651-010, 704A33-651-111, or 704A33-651-143 on any helicopter.

(g) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Rotorcraft Standards Branch, FAA, may approve 
AMOCs for this AD. Send your proposal to: David Hatfield, Aviation 
Safety Engineer, Safety Management Section, Rotorcraft Standards 
Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 
817-222-5116; 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. 
2015-0195, dated September 23, 2015. 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: 6510, Tail Rotor 
Drive Shaft.

    Issued on October 6, 2020.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2020-22504 Filed 10-13-20; 8:45 am]
BILLING CODE 4910-13-P