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Federal Register / Vol. 86, No. 171 / Wednesday, September 8, 2021 / Rules and Regulations
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rotorcraft flight manual RFM for your helicopter, repetitively inspecting the main gearbox MGB particle detectors, repetitively inspecting the MGB oil filter and oil cooler, and corrective action if necessary, as specified in a European Union Aviation Safety Agency EASA
AD, which is incorporated by reference.
The actions specified in this AD
terminate the flight prohibition. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective October 13, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of October 13, 2021.
ADDRESSES: For EASA material incorporated by reference IBR in this AD, contact the EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221 8999 000;
email ADs@easa.europa.eu; internet www.easa.europa.eu. You may find this material on the EASA website at https
ad.easa.europa.eu. For Airbus Helicopters service information, contact Airbus Helicopters, 2701 North Forum Drive, Grand Prairie, TX 75052;
telephone 972 6410000 or 800 232
0323; fax 972 6413775; or at https
www.airbus.com/helicopters/services/
technical-support.html. You may view this material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 8172225110. It is also available in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210379.
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. FAA2021
0379; 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, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Mahmood Shah, Aviation Safety Engineer, Fort Worth ACO Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817222
5538; email mahmood.g.shah@faa.gov.
SUPPLEMENTARY INFORMATION:

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Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 2017
0134R2, dated April 16, 2020 EASA AD
20170134R2 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus Helicopters Model AS332L2 and EC225LP helicopters.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20161251, Amendment 3918578 81 FR 43479, July 5, 2016 AD 20161251. AD
20161251 applied to all Airbus Helicopters Model AS332L2 and EC225LP helicopters. The NPRM
published in the Federal Register on June 1, 2021 86 FR 29212. The NPRM
was prompted by an accident involving an Airbus Helicopters Model EC225LP
helicopter in which the main rotor hub detached from the MGB. The Airbus Helicopters Model AS332L2 helicopter has a similar design to the affected Model EC225LP helicopter, therefore, this model may be subject to the unsafe condition revealed on the Model EC225LP helicopter. The NPRM
proposed to require replacing certain second stage planet gear assemblies, removing certain epicyclic modules, installing an FFMP, revising the existing RFM for your helicopter, repetitively inspecting the MGB particle detectors, repetitively inspecting the MGB oil filter and oil cooler, and corrective action if necessary, as specified in EASA AD
20170134R2. The NPRM also proposed to provide terminating action for certain repetitive inspections.
The FAA is issuing this AD to address failure of the main rotor system, which would result in loss of control of the helicopter. See the MCAI for additional background information.
Discussion of Final Airworthiness Directive Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and
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Do not add any additional burden upon the public than was already proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
EASA AD 20170134R2 references procedures for replacing certain second stage planet gear assemblies with serviceable parts; removing certain epicyclic modules from service;
modifying the helicopter by installing an FFMP; revising the RFM to prohibit MGB particle burning in-flight;
repetitively inspecting the FFMP and MGB particle detectors for metal particles, analyzing any metal particles that are found, and corrective action;
and repetitively inspecting the MGB oil filter and oil cooler for particles and corrective action. The corrective actions include replacing an affected MGB with a serviceable MGB. EASA AD 2017
0134R2 also provides terminating action for certain repetitive inspections.
Airbus Helicopters has issued Emergency Alert Service Bulletin 05A049, Revision 6, dated July 25, 2017, for Model EC225 helicopters; and Emergency Alert Service Bulletin 05.01.07, Revision 6, dated July 27, 2017, for Model AS332 helicopters. The service information specifies procedures for, among other things, replacing the MGB.
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.
Differences Between This AD and the MCAI
Although the service information referenced in EASA AD 20170134R2
specifies to return affected planetary gear assemblies to the manufacturer for module overhaul, this AD does not include that requirement.
Although the service information referenced in EASA AD 20170134R2
specifies that retrofit of the planet gear of the MGB can only be done by Airbus Helicopters or Airbus Helicopters approved repair centers, this AD does not include that requirement.
EASA AD 20170134R2 requires operators to inform all flight crews of revisions to the RFM, and thereafter to operate the helicopter accordingly.
However, this AD does not specifically require those actions. FAA regulations mandate compliance with only the operating limitations section of the flight manual. The flight manual changes required by this AD apply to the emergency procedures section of the existing RFM for your helicopter.
Furthermore, compliance with such
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