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Federal Register / Vol. 86, No. 244 / Thursday, December 23, 2021 / Rules and Regulations engine power when accelerating to a power setting corresponding to One Engine Inoperative OEI power and subsequent reduced control of the helicopter.
The NPRM was prompted by EASA
AD 20190092, dated April 26, 2019
EASA AD 20190092, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for Airbus Helicopters formerly Eurocopter Model EC 225 LP
helicopters, all serial numbers. EASA
advised that an occurrence was reported where during an in-flight single engine power check, the LH side engine experienced a power loss. EASA stated that a subsequent investigation determined that the fuel flow to the affected engine was restricted by a twisted fuel supply hose. EASA stated that this condition, if not detected and corrected, could lead to a decrease of the LH engine power when accelerating to the power setting corresponding to OEI power, and subsequent reduced control of the helicopter. Accordingly, EASA AD 20190092 required a onetime visual inspection of the fuel supply hose and depending on the inspection results, removing from service or replacing the affected part. EASA AD
20190092 also introduced reinstallation requirements for a fuel supply hose that is being replaced or reinstalled.
After the FAA issued the NPRM, the FAA issued a supplemental notice of proposed rulemaking SNPRM to amend 14 CFR part 39 by adding an AD
that would apply to Airbus Helicopters Model EC225LP helicopters with a LH
fuel supply hose P/N 704A34416087
installed. The SNPRM published in the Federal Register on May 10, 2021 86
FR 24783, May 10, 2021 the May 2021
SNPRM. The May 2021 SNPRM
proposed to require visually inspecting the LH fuel supply hose P/N
704A34416087 for twisting, and if needed, borescope inspecting the entire length of the inside of the fuel supply hose for twisting. Depending on the inspection results, the May 2021
SNPRM proposed to require reinstalling or removing the fuel supply hose from service. Additionally, the May 2021
SNPRM proposed to prohibit installing a certain part-numbered LH fuel supply hose on any helicopter unless that LH
fuel supply hose is installed by following certain procedures specified in the manufacturers service bulletin.
The May 2021 SNPRM was prompted by the FAAs determination that operators may not have the information required to comply with the proposed requirements in the NPRM. Operators
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may not know the date the helicopter was delivered to the first operator.
Additionally, operators may not know whether the LH fuel supply hose has been previously removed or reinstalled since the maintenance regulations do not require certain operators to maintain these records after one year.
Accordingly, the FAA determined that revising proposed paragraph e1
of the NPRM by deleting the language referring to delivery dates and dates of LH fuel supply hose replacement or reinstallation was necessary. As a result of these changes, the FAA revised the NPRM to specify that all helicopters included in the applicability paragraph would be required to comply with the proposed requirements in the May 2021
SNPRM. Also, after the NPRM was issued, the FAA determined that a limit on special flight permits was required.
The May 2021 SNPRM reflected this change and stated that special flight permits may be permitted provided that there are no passengers on board.
Since the May 2021 SNPRM was issued, EASA issued EASA AD 2021
0156, dated July 2, 2021 EASA AD
20210156, which supersedes EASA
AD 20190092. EASA advises that Airbus Helicopters has developed an improved fuel supply hose P/N
704A34416101 and modification instructions to install the improved part.
Accordingly, EASA AD 20210156
retains the requirements of EASA AD
20190092 and requires replacing the affected part with the improved part.
EASA AD 20210156 also allows a terminating action for the inspection requirements once the improved part has been installed according to the installation requirements.
Accordingly, the FAA issued a second SNPRM to amend 14 CFR part 39 by adding an AD that would apply to Airbus Helicopters Model EC225LP
helicopters with a LH fuel supply hose P/N 704A34416087 installed. This SNPRM published in the Federal Register on September 7, 2021 86 FR
49937, September 7, 2021 the September 2021 SNPRM. The September 2021 SNPRM proposed to require visually inspecting the LH fuel supply hose for twisting, and if needed, borescope inspecting the entire length of the inside of the fuel supply hose for twisting. Depending on the inspection results, the September 2021 SNPRM
proposed to require reinstalling or removing the fuel supply hose from service.
Additionally, the September 2021
SNPRM proposed to prohibit installing a certain part-numbered LH fuel supply hose on any helicopter unless that LH
fuel supply hose is installed by
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following certain procedures described in the manufacturers service bulletin.
Finally, the September 2021 SNPRM
proposed to require modifying your helicopter by removing from service LH
fuel supply hose P/N 704A34416087
and installing the improved LH fuel supply hose P/N 704A34416101. This modification would provide terminating action for the proposed inspection requirements of the September 2021
SNPRM.
Discussion of Final Airworthiness Directive Comments The FAA received comments from six commenters on the September 2021
SNPRM. Five commenters supported the SNPRM without change and one individual supported the SNPRM but requested a certain change. The following presents this comment and the FAAs response.
Request To Revise the Required Actions Section To Include Additional Inspections One individual requested that the FAA revise the Required Actions section of this AD to include repetitive inspections of the LH fuel supply hose for one year after initial installation of the new supply hose. The individual stated this will ensure maximum safety and efficiency.
The FAA disagrees with this request because the unsafe condition is adequately addressed by installing the improved fuel supply hose in accordance with this AD.
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, considered the comments received, 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
The FAA reviewed Airbus Helicopters Alert Service Bulletin No. EC225
71A019, Revision 2, dated May 21, 2021
which specifies procedures for removing the fuel supply hose from the LH power plant, visually inspecting the fuel supply hose for twisting, and depending on inspection results, performing an endoscope inspection on the inside of the hose. This service
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