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Federal Register / Vol. 86, No. 132 / Wednesday, July 14, 2021 / Rules and Regulations Issued in Des Moines, Washington, on July 7, 2021.
Mary A. Schooley, Acting Manager, Technical Innovation Policy Branch, Policy and Innovation Division, Aircraft Certification Service.
FR Doc. 202114975 Filed 71321; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210335; Project Identifier MCAI202001665R; Amendment 3921632; AD 20211405
RIN 2120AA64

Airworthiness Directives; Airbus Helicopters Deutschland GmbH
Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all Airbus Helicopters Deutschland GmbH
Model MBBBK 117 A1, MBBBK 117
A3, MBBBK 117 A4, MBBBK 117
B1, MBBBK 117 B2, and MBBBK
117 C1 helicopters. This AD was prompted by a report of sudden severe vibrations and a cracked open blade trailing edge caused by a loosened lead inner weight. This AD requires inspections to determine if any bolted main rotor blades are installed, and replacement of the affected main rotor blades. The FAA is issuing this AD to address the unsafe condition on these products.

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210335; 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, the Luftfahrt-Bundesamt AD, any comments received, and other information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Kathleen Arrigotti, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
phone and fax: 2062313218; email:
kathleen.arrigotti@faa.gov.
SUPPLEMENTARY INFORMATION:

SUMMARY:

Background
This AD is effective August 18, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain document listed in this AD
as of August 18, 2021.
ADDRESSES: For service information identified in this final rule, contact Airbus Helicopters, 2701 N Forum Drive, Grand Prairie, TX 75052; phone:
9726410000 or 8002320323; fax:
9726413775; or at https
www.airbus.com/helicopters/services/support.html. You may view the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX
76177. Service information that is incorporated by reference is also available at https www.regulations.gov
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Airbus Helicopters Deutschland GmbH Model MBBBK 117
A1, MBBBK 117 A3, MBBBK 117
A4, MBBBK 117 B1, MBBBK 117
B2, and MBBBK 117 C1 helicopters.
The NPRM published in the Federal Register on April 26, 2021 86 FR
21965. In the NPRM, the FAA proposed to require inspections to determine if any bolted main rotor blades are installed, and replacement of the affected main rotor blades. The NPRM
was prompted by a report of sudden severe vibrations and a cracked open blade trailing edge caused by a loosened lead inner weight.
German AD D2005115, effective March 15, 2005 German AD D2005
115, issued by Luftfahrt-Bundesamt, which is the aviation authority for Germany, was issued to correct an unsafe condition for Eurocopter Deutschland now Airbus Helicopters Deutschland GmbH Model MBBBK
117 A1, MBBBK 117 A3, MBBBK
117 A4, MBBBK 117 B1, MBBBK
117 B2, and MBBBK 117 C1
helicopters. Luftfahrt-Bundesamt advises that during the flight of a BK117
severe vibrations suddenly occurred, stemming from a cracked open blade trailing edge, which was traced to a loosened lead inner weight bolt.
Additional inspection revealed extreme
DATES:

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cavities of the lead weight resulting from the bolting process, which was performed as a repair for main rotor blades with bulging in the area of the lead inner weights. This condition, if not addressed, could result in loss of control of the helicopter.
Accordingly, German AD D2005115
requires an inspection and log card review to determine if any bolted main rotor blades are installed, and replacement of the affected main rotor blades.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion These helicopters have been approved by the aviation authority of Germany and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with Germany now a member of the European Union, Luftfahrt-Bundesamt, its technical representative, has notified the FAA of the unsafe condition described in its AD. The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these helicopters. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Eurocopter Alert Service Bulletin No. ASBMBBBK117
10125, dated February 14, 2005. This service information specifies procedures for an inspection for cracking of the paint and log card review for a certain entry or equivalent to determine if any bolted main rotor blades i.e., main rotor blades with bolted lead inner weights are installed, and replacement of the affected main rotor blades.
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.
Costs of Compliance The FAA estimates that this AD
affects 44 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 AD.

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