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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Proposed Rules
placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA
01803. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20190180, dated July 25, 2019
referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:
Occurrences have been reported of nonconforming fuel filter pre-blockage pressure switches, manufactured before December 2016. The non-conformity of the fuel filter pre-blockage pressure switch can cause its non-activation in case of fuel system contamination, with consequent opening of the by-pass without indication in the cockpit.
This condition, if not detected and corrected, and in case of fuel contamination, could lead to an uncommanded in-flight shut-down, possibly resulting in an emergency autorotation landing on a single engine helicopter, or to a double uncommanded in-flight shut-down on a twin engine helicopter.
To address this potential unsafe condition, SAFRAN issued the MSB, providing inspection instructions.
For the reasons described above, this EASA AD requires repetitive daily visual checks of the fuel filter by-pass indicator pop-up. This EASA AD also requires a onetime operational check of the affected part and, depending on findings, replacement of that part, which constitutes terminating action for the repetitive daily checks as required by this EASA AD.

You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201180.

FAAs Determination This product has been approved by EASA and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us of the unsafe condition described in the MCAI and service information referenced above. The FAA is proposing this AD because the agency evaluated all the relevant information provided by EASA and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Task 732301
750801A01Pre-Blockage Pressure Switch of the Fuel Filter Tests Electrical, dated November 30, 2012, from the Turbomeca Arriel 2 S1
Maintenance Manual. Task 732301
750801A01 provides instructions for performing an operational test of the fuel filter pre-blockage pressure switch.
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 ADDRESSES.
Other Related Service Information The FAA reviewed Safran Helicopter Engines Mandatory Service Bulletin MSB No. 292 73 2869, Version B, dated December 2018. The MSB
describes procedures for identifying and securing pre-blockage pressure switches of fuel filter part number P/N 9 550 17
200 0, which are potentially nonconforming.
Proposed AD Requirements in This NPRM
This proposed AD would require repetitive visual inspections of the fuel filter by-pass indicator pop-up, a onetime operational test of the fuel filter pre-blockage pressure switch and,
depending on the findings, replacement of the fuel filter pre-blockage pressure switch with a part eligible for installation.
Justification for Allowing Pilot To Perform Visual Inspection This proposed AD would allow the visual inspections required by paragraph g1 of this NPRM to be performed by an aircrew member holding at least a private pilot certificate. Performing a visual inspection to determine if the fuel filter by-pass indicator pop-up has been activated is not considered an action that must be performed by a certified person under 14 CFR 43.3. This authorization is an exception to our standard maintenance regulations.
Differences Between This Proposed AD
and the MCAI or the Service Information EASA AD 20190180 defines Group 1 engines as Safran Helicopter Engines Arriel 2B, 2B1, 2B1A, 2C, 2C1, 2C2, 2S1
and 2S2 model turboshaft engines with an affected a fuel filter pre-blockage pressure switch and Group 2 engines as the same Safran Helicopter Engines Arriel turboshaft engines not equipped with an affected fuel filter pre-blockage pressure switch. This AD does not define or use Group 1 or Group 2
and identifies both the affected engines and the affected fuel filter pre-blockage pressure switch in the Applicability paragraph. This AD does not include Safran Helicopter Engines Arriel 2B1A
model turboshaft engines since these engines are not type certificated in the United States.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 775
engines installed on helicopters of U.S.
registry.
The FAA estimates the following costs to comply with this proposed AD:

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ESTIMATED COSTS
Cost per product
Labor cost
Visual inspection of fuel filter by-pass indicator.
Operational test of the fuel filter pre-blockage pressure switch.

1 work-hour $85 per hour = $85

$0

$85

$65,875

3 work-hours $85 per hour = $255

0

255

197,625

The FAA estimates the following costs to do any necessary replacement that would be required based on the
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Parts cost
Cost on U.S.
operators
Action
results of the proposed inspection. The FAA has no way of determining the
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number of aircraft that might need this replacement.

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