SUPPLEMENTARY INFORMATION:

Discussion

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 Model EC120B helicopters. The NPRM published in the Federal Register on March 11, 2020 (85 FR 14178). The NPRM was prompted by a report that a changed manufacturing process for the TRB was implemented, affecting the structural characteristics of the blades and generating a new part number for these blades. The NPRM proposed to require re-identifying each affected TRB having a certain part number and serial number and establishing a life limit for the new part numbers. The NPRM also proposed to prohibit installation of any affected TRB identified with the old part number on any helicopter. The FAA is issuing this AD to ensure the new part number (P/N) TRBs do not exceed their life limit, which could lead to loss of the TRB and subsequent loss of control of the helicopter.

The European Aviation Safety Agency (now European Union Aviation Safety Agency) (EASA), which is the Technical Agent for the Member States of the European Union, has issued EASA AD 2018-0183, dated August 28, 2018 (also referred to as the Mandatory Continuing Airworthiness Information, or “the MCAI”), to correct an unsafe condition for all Airbus Helicopters Model EC120B helicopters. You may examine the MCAI in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-0239.

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
• Do not add any additional burden upon the public than was already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

Airbus Helicopters has issued Alert Service Bulletin EC120-04A008, Revision 0, dated July 18, 2018 (“ASB EC120-04A008”). This service information describes procedures for re-identifying a TRB with P/N C642A0300103 for certain serial numbers as specified in ASB EC120-04A008. 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 94 helicopters of U.S. registry. The FAA estimates the following costs to comply with this AD: ( printed page 34958)

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

This AD will not have federalism implications under Executive Order 13132. This AD will 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 above, I certify that this AD:

(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.

Adoption of the Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):

2020-12-02 Airbus Helicopters: Amendment 39-21136; Docket No. FAA-2020-0239; Product Identifier 2018-SW-073-AD.

(a) Effective Date

This AD is effective July 13, 2020.

(b) Affected ADs

None.

(c) Applicability

This AD applies to all Airbus Helicopters Model EC120B helicopters, certificated in any category.

(d) Subject

The Joint Aircraft System/Component (JASC) Code 6410, Tail rotor blades.

(e) Reason

This AD was prompted by a report that a new manufacturing process for the tail rotor blades (TRBs) has been implemented, affecting the structural characteristics of the TRB and generating a new part number (P/N) for these blades. It was determined that a new life limit is needed for the new P/N TRBs. The FAA is issuing this AD to ensure the new P/N TRBs do not exceed their life limit, which could lead to loss of the TRB and subsequent loss of control of the helicopter.

(f) Compliance

Comply with this AD within the compliance times specified, unless already done.

(g) Definition of an Affected Part for Re-Identification and Validation of Rework/Repair/Modification

An “affected part” is a TRB having P/N C642A0300103 and a serial number specified in Appendix 4.A. of Airbus Helicopters Alert Service Bulletin EC120-04A008, Revision 0, dated July 18, 2018 (“ASB EC120-04A008”).

(h) Part Replacement (Life Limit Implementation)

Before exceeding 8,500 hours time-in-service (TIS) since first installation on a helicopter: Remove from service each TRB having P/N C642A0300104 or P/N C642A0300105.

(i) Part Re-Identification and Validation of Rework/Repair/Modification

(1) Within 1,000 hours TIS after the effective date of this AD: Re-identify each affected part in accordance with 3.B. of the Accomplishment Instructions of ASB EC120-04A008.

(2) Within 6 months after the effective date of this AD, for each affected part which has been subject to rework, repair, or modification before the re-identification as required by paragraph (i)(1) of this AD, contact the Manager, Safety Management Section, Rotorcraft Standards Branch, FAA, for additional applicable maintenance instructions and, within the compliance time identified in those instructions, accomplish those instructions accordingly.

(j) Parts Installation Prohibition and Rework/Repair/Modification Limitation

(1) As of the effective date of this AD, no person may install a TRB having P/N C642A0300103 and a serial number specified in Appendix 4.A. of ASB EC120-04A008 on any helicopter.

(2) As of the effective date of this AD, no person may accomplish any rework, repair, or modification of an affected part, unless it has been determined that the rework, repair, or modification is FAA-approved for P/N C642A0300105.

(k) Alternative Methods of Compliance (AMOCs)

(1) The Manager, Safety Management Section, Rotorcraft Standards Branch, FAA, may approve AMOCs for this AD. Send your proposal to: Kristi Bradley, Aviation Safety Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817-222-5485; 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, 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.

(l) Related Information

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) European Aviation Safety Agency (now European Union Aviation Safety Agency) AD 2018-0183, dated August 28, 2018, for related information. This MCAI may be found in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-0239. ( printed page 34959)

(2) For more information about this AD, contact Kristi Bradley, Aviation Safety Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817-222-5485; email Kristin.Bradley@faa.gov.

(m) Material Incorporated by Reference

(1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise.

(i) Airbus Helicopters Alert Service Bulletin EC120-04A008, Revision 0, dated July 18, 2018.

(ii) [Reserved]

(3) For service information identified in this AD, 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.helicopters.airbus.com/​website/​en/​ref/​Technical-Support_​73.html.

(4) You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N-321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817-222-5110.

(5) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email fedreg.legal@nara.gov, or go to: https://www.archives.gov/​federal-register/​cfr/​ibr-locations.html.

85 FR 34957