81 FR 83182 - Airworthiness Directives; Airbus Helicopters Deutschland GmbH

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 81, Issue 224 (November 21, 2016)

We propose to adopt a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) MBB-BK 117 D-2 helicopters. This proposed AD would require repetitively inspecting the bushings of the inner and outer forward trusses of both engines. This proposed AD is prompted by reports of delaminated and worn engine mount bushings. The proposed actions are intended to detect delaminated engine mount bushings, which can lead to excessive vibration, cracking, failure of the engine mount front support pins, and loss of helicopter control.

[Federal Register Volume 81, Number 224 (Monday, November 21, 2016)]
[Proposed Rules]
[Pages 83182-83184]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2016-27765]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-3257; Directorate Identifier 2015-SW-072-AD]
RIN 2120-AA64


Airworthiness Directives; Airbus Helicopters Deutschland GmbH

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
Airbus Helicopters Deutschland GmbH (Airbus Helicopters) MBB-BK 117 D-2 
helicopters. This proposed AD would require repetitively inspecting the 
bushings of the inner and outer forward trusses of both engines. This 
proposed AD is prompted by reports of delaminated and worn engine mount 
bushings. The proposed actions are intended to detect delaminated 
engine mount bushings, which can lead to excessive vibration, cracking, 
failure of the engine mount front support pins, and loss of helicopter 
control.

DATES: We must receive comments on this proposed AD by January 20, 
2017.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Docket: Go to http://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 http://www.regulations.gov by searching for and locating Docket No. FAA-2016-
3257; or in person at the Docket Operations Office between 9 a.m. and 5 
p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this proposed AD, European Aviation Safety Agency (EASA) AD, 
the economic evaluation, any comments received, and other information. 
The street address for the Docket Operations Office (telephone 800-647-
5527) is in the ADDRESSES section. 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 
http://www.airbushelicopters.com/techpub. You may review 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, Senior Aviation Safety 
Engineer, Safety Management Group, Rotorcraft Directorate, FAA, 10101 
Hillwood Pkwy, Fort Worth, TX 76177; telephone (817) 222-5110; email 
[email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to participate in this rulemaking by submitting 
written comments, data, or views. We also invite comments relating to 
the economic, environmental, energy, or

[[Page 83183]]

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

Discussion

    EASA, which is the Technical Agent for the Member States of the 
European Union, has issued EASA AD No. 2015-0198, dated September 30, 
2015, to correct an unsafe condition for Airbus Helicopters Model MBB-
BK 117 D-2 helicopters. EASA advises that during a pre-flight check of 
an MBB-BK 117 D-2 helicopter, an engine mount bushing was found 
delaminated. More cases of delaminated engine mount bushings were 
reported following additional investigations. According to EASA, this 
condition could lead to cracks and eventually failure of the engine 
mount front support pins, possibly resulting in loss of helicopter 
control.
    The EASA AD consequently requires repetitive inspections of the 
engine mount bushings and depending of the findings, repairing or 
replacing the bushings.

FAA's Determination

    These helicopters have been approved by the aviation authority of 
Germany and are approved for operation in the United States. Pursuant 
to our bilateral agreement with Germany, EASA, its technical 
representative, has notified us of the unsafe condition described in 
its AD. We are proposing this AD because we evaluated all known 
relevant information and determined that an unsafe condition is likely 
to exist or develop on other products of the same type design.

Related Service Information

    We reviewed Airbus Helicopters Alert Service Bulletin (ASB) MBB-
BK117 D-2-71A-002, Revision 0, dated September 28, 2015, for Model MBB-
BK 117 D-2 helicopters. The ASB introduces repetitive visual 
inspections of the engine mount bushings for defects, deformation, 
separation of the rubber, and missing rubber after reports of 
delaminated engine mount bushings and bushings with damage to the metal 
inner sleeve. If there is any deformation or separation of the rubber, 
the ASB specifies performing a detailed inspection of the bushing in 
accordance with the aircraft maintenance manual.

Proposed AD Requirements

    This proposed AD would require within 50 hours time-in-service 
(TIS) and at intervals not to exceed 50 hours TIS thereafter, visually 
inspecting the bushings of the inner and outer forward trusses of both 
engines, and depending on the outcome of the inspections, replacing or 
repairing the bushings before further flight.

Differences Between This Proposed AD and the EASA AD

    The EASA AD allows for a 10 hour time-in-service, non-cumulative 
tolerance for its required compliance times. This proposed AD would 
not.

Costs of Compliance

    We estimate that this proposed AD would affect 5 helicopters of 
U.S. Registry and that labor costs average $85 per work hour. Based on 
these estimates, we expect the following costs:
     Inspecting the bushings would require 1 work hour. No 
parts would be needed, for a total cost of $85 per helicopter and $425 
for the U.S. fleet.
     Replacing a bushing would require 1 work hour and $373 for 
parts, for a total cost of $458 per bushing.

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.
    We are 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

    We 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. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979);
    3. Will not affect intrastate aviation in Alaska to the extent that 
it justifies making a regulatory distinction; and
    4. 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.
    We prepared an economic evaluation of the estimated costs to comply 
with this proposed AD and placed it in the AD docket.

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 adding the following new airworthiness 
directive (AD):

Airbus Helicopters Deutschland GmbH: Docket No. FAA-2016-3257; 
Directorate Identifier 2015-SW-072-AD.

(a) Applicability

    This AD applies to Airbus Helicopters Deutschland GmbH Model 
MBB-BK 117 D-2 helicopters with a bushing part number 105-60386 
installed, certificated in any category.

(b) Unsafe Condition

    This AD defines the unsafe condition as a delaminated engine 
mount bushing. This

[[Page 83184]]

condition could result in excessive vibration, which could lead to 
cracking and failure of the engine mount front support pins, and 
loss of helicopter control.

(c) Comments Due Date

    We must receive comments by January 20, 2017.

(d) 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.

(e) Required Actions

    Within 50 hours time-in-service (TIS) and thereafter at 
intervals not to exceed 50 hours TIS:
    (1) Visually inspect each engine mount bushing (bushing) for 
separation of the rubber from the metal or missing rubber.
    (2) If any rubber has separated from the metal or if there is 
missing rubber, inspect the bushing for deformation, corrosion, and 
mechanical damage.
    (i) Replace the bushing with an airworthy bushing if there is 
any deformation, separation of the rubber from the metal, corrosion, 
or mechanical damage, or repair the bushing if the deformation, 
separation of the rubber, corrosion, or mechanical damage is within 
the maximum repair damage limitations.
    (ii) If the inner and outer parts of the bushing are separated 
with missing rubber, replace the bushing with an airworthy bushing.

(f) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Safety Management Group, FAA, may approve AMOCs 
for this AD. Send your proposal to: Matt Fuller, Senior Aviation 
Safety Engineer, Safety Management Group, Rotorcraft Directorate, 
FAA, 10101 Hillwood Pkwy, Fort Worth, TX 76177; telephone (817) 222-
5110; email [email protected].
    (2) For operations conducted under a 14 CFR part 119 operating 
certificate or under 14 CFR part 91, subpart K, we suggest 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.

(g) Additional Information

    (1) Airbus Helicopters Alert Service Bulletin ASB MBB-BK117 D-2-
71A-002, Revision 0, dated September 28, 2015, which is not 
incorporated by reference, contains additional information about the 
subject of this proposed rule. 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 http://www.airbushelicopters.com/techpub. 
You may review the referenced service information at the FAA, Office 
of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy, Room 
6N-321, Fort Worth, TX 76177.
    (2) The subject of this AD is addressed in European Aviation 
Safety Agency (EASA) AD No. 2015-0198, dated September 30, 2015. You 
may view the EASA AD on the Internet at http://www.regulations.gov 
in the AD Docket.

 (h) Subject

    Joint Aircraft Service Component (JASC) Code: 7200, Engine 
(Turbine, Turboprop).

    Issued in Fort Worth, Texas, on November 10, 2016.
Lance T. Gant,
Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 2016-27765 Filed 11-18-16; 8:45 am]
 BILLING CODE 4910-13-P