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Federal Register / Vol. 86, No. 225 / Friday, November 26, 2021 / Rules and Regulations
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:
Jacob Fitch, Aerospace Engineer, COS
Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
phone: 817 2224130; email:
jacob.fitch@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20210044, dated February 5, 2021
EASA AD 20210044 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Leonardo S.p.a. Model AB139
and AW139 helicopters.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Leonardo S.p.a. Model AB139 and AW139 helicopters. The NPRM published in the Federal Register on June 14, 2021 86 FR 31451.
The NPRM was prompted by a report of a short circuit caused by chafing of the electrical wiring in the overhead panel.
The NPRM proposed to require an initial detailed inspection inside the overhead panel for certain helicopters, repetitive detailed inspections inside the overhead panel for all helicopters, and corrective actions if necessary, as specified in EASA AD 20210044.
The FAA is issuing this AD to address a short circuit caused by chafing of the electrical wiring in the overhead panel, which could cause damaged electrical
wiring, possible fire in the overhead panel, and loss of control of the helicopter. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The following presents the comment received on the NPRM and the FAAs response to each comment.
Request To Include Credit for Later Service Information An anonymous commenter requested that the FAA revise the NPRM to include a paragraph that allows credit for the use of a later revision of the service information referenced in EASA
AD 20210044.
The FAA disagrees with the request because, in this case, credit is unnecessary. The FAA is incorporating by reference EASA AD 20210044 as the method for accomplishing the actions required by this AD. EASA AD 2021
0044 includes the Ref. Publications section, which allows the use of later approved revisions of the service information referenced in EASA AD
20210044. Therefore, no change has been made to this AD.

helicopters inside the overhead panel for chafing of the cable harnesses and for correct clearance between the anchor nuts/screws and the cable harnesses, of the screws for correct length, and of the supports for sound bonding, and corrective actions if necessary;
repetitive detailed inspections for all helicopters inside the overhead panel for the condition of the white protective tape on the anchor nuts, and for chafing of the cable harnesses and for correct clearance between the anchor nuts/
screws and the cable harnesses, and corrective actions if necessary.
Corrective actions include applying a white protective tape on the anchor nuts, replacement of incorrect length screws, replacement of damaged cables and fuses, rerouting of cable harnesses, replacement of supports, and removal and replacement of the white protective tape.
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

Conclusion The FAA reviewed the relevant data, considered the comment received, 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 Do not add any additional burden upon the public than was already proposed in the NPRM.

Although EASA AD 20210044 and the service information referenced in EASA AD 20210044 specify to submit certain information to the manufacturer, this AD does not include that requirement.

Related Service Information Under 1
CFR Part 51
EASA AD 20210044 requires an initial detailed inspection for certain
The FAA estimates that this AD
affects 128 helicopters of U.S. Registry.
The FAA estimates the following costs to comply with this AD:

Interim Action The FAA considers this AD interim action. If final action is later identified, the FAA might consider further rulemaking then.
Costs of Compliance
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ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Inspection for chafing, clearance, screw length, and bonding.
Repetitive inspections for chafing, clearance, and tape condition.

1 work-hour $85 per hour = $85
1 work-hour $85 per hour = $85
per inspection cycle.

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
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Cost per product
Parts cost $0

$85

$0 per inspection cycle
$85 per inspection cycle
the results of any required actions. The FAA has no way of determining the
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Cost on U.S.
operators
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$10,880.
$10,880 per inspection cycle.

number of helicopters that might need these on-condition actions:

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