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Federal Register / Vol. 86, No. 131 / Tuesday, July 13, 2021 / Rules and Regulations France Model SA365N, SA365N1, AS365N2, and AS 365 N3 helicopters.
The NPRM published in the Federal Register on April 22, 2021 86 FR
21231. The NPRM proposed to continue to require, for helicopters that have a No. 9 frame that has had any repair or alteration made, within 10
hours time-in-service TIS after the effective date of the AD and at intervals not to exceed 110 hours TIS thereafter, inspecting the LH and RH frame No. 9
for a crack in the areas of the latch support and stretcher support with a 10X or higher power magnifying glass.
For all other helicopters, the NPRM
proposed to require the inspection within 110 hours TIS after the effective date of the AD and thereafter at intervals not to exceed 110 hours TIS. If there is a crack, the NPRM proposed to continue to require, before further flight, repairing the crack. The NPRM also proposed to provide an optional terminating action for the repetitive inspections that would consist of installing Eurocopter modification MOD 53C17 or MOD 53D02, or Airbus Helicopters MOD 07 53D21 or MOD 07
53D22, as applicable to your helicopter.
The NPRM was prompted by EASA
AD 20120108R1, dated September 19, 2019 EASA AD 20120108R1, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for certain Airbus Model helicopters except those that have been modified by Eurocopter MOD 53C17 or MOD 53D02, or Airbus Helicopters AH MOD 07
53D21 or MOD 07 53D22. EASA AD
20120108R1 revises EASA AD 2012
0108E, dated June 15, 2012 EASA AD
20120108E, which was issued after a crack was discovered during the T
inspection of an AS365 helicopter. The crack started at a rivet hole of a doubler that was installed on the frame No. 9 in accordance with Eurocopter Alert Service Bulletin No. 53.00.42, dated January 31, 2001. EASA stated in EASA
AD 20120108E that structural alteration of frame No. 9 by modifications or repairs can result in fatigue crack initiation under normal operational loads. According to EASA, this condition, if not corrected, could lead to crack propagation and failure of frame No. 9, which would adversely affect the structural integrity of the helicopter. For these reasons, EASA AD
20120108E required repetitive inspections of frame No. 9 for a crack in the area of the doubler or any repair performed in the area of the latch support and stretcher support. EASA
advises in EASA AD 20120108R1 that Airbus Helicopters developed MOD 07

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53D21 and MOD 07 53D22.
Consequently, EASA AD 20120108R1
was issued to introduce the MODs as optional terminating action for the repetitive inspections, reduce the applicability by excluding certain postMOD helicopters, and make some editorial changes that do not affect the required actions.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM nor on the determination of the costs.
Conclusion These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA about 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.
Related Service Information Under 1
CFR Part 51
Airbus Helicopters has co-published as one document Emergency Alert Service Bulletin EASB No. 05.00.63, Revision 2, dated December 20, 2018
EASB 05.00.63 Rev 2, for Model AS365-series helicopters and EASB No.
05.00.30, Revision 2, dated December 20, 2018 EASB 05.00.30 Rev 2, for non-FAA type certificated Model AS565-series helicopters. EASB
05.00.63 Rev 2 is incorporated by reference in this AD; EASB 05.00.30 Rev 2 is not.
EASB 05.00.63 Rev 2 applies to helicopters with a frame No. 9 that has not been modified by MOD 07 53C17, 07 53D21, 07 53D22, or 07 53D02, and that has had doublers installed or repairs performed in accordance with certain service instructions. EASB
05.00.63 Rev 2 describes procedures for inspecting the frame No. 9 for a crack and specifies contacting Airbus Helicopters for further procedures if there is a crack.
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.
Other Related Service Information The FAA reviewed Airbus Helicopters Service Bulletin SB No. AS365
53.00.57, Revision 0, dated December 20, 2018 SB AS36553.00.57, for
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Model AS365-series helicopters. SB
AS36553.00.57 specifies replacing the upper section of the No. 9 frame with a reinforced version as an option to terminate the visual inspections specified in EASB 05.00.63 Rev 2.
The FAA also reviewed Eurocopter Emergency Alert Service Bulletin EASB
No. 05.00.63, Revision 1, dated June 18, 2012 EASB 05.00.63 Rev 1. EASB
05.00.63 Rev 1 specifies the same procedures as EASB 05.00.63 Rev 2;
however, EASB 05.00.63 Rev 2 excludes helicopters with certain MODs installed from its effectivity.
Differences Between This AD and the EASA AD
EASA AD 20120108R1 requires contacting Airbus Helicopters for repair instructions if there is a crack; this AD
does not. EASA AD 20120108R1
applies to Airbus Helicopters Model 365-series helicopters with a frame No.
9 on which certain doublers or repairs have been accomplished; this AD
applies to those model helicopters regardless of if those doublers or repairs have been accomplished.
Costs of Compliance The FAA estimates that this AD
affects 33 helicopters of U.S. Registry.
The FAA estimates that operators may incur the following costs in order to comply with this AD. At an average labor rate of $85 per hour, inspecting the LH and RH frame No. 9 takes about 3 work-hours, for a cost per helicopter of $255 and a total cost to U.S. operators of $8,415 per inspection cycle.
Repairing a cracked frame No. 9 takes about 20 work-hours, and required parts cost about $15,000, for a cost per helicopter of $16,700.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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
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