Federal Register - March 11, 2021
Versione di testo Cosa è?Dateas è un sito indipendente non affiliato a entità governative. La fonte dei documenti PDF che pubblichiamo qui è l'entità governativa indicata in ciascuno di essi. Le versioni in testo sono trascrizioni che realizziamo per facilitare l'accesso e la ricerca di informazioni, ma possono contenere errori o non essere complete.
Source: Federal Register
13808
Federal Register / Vol. 86, No. 46 / Thursday, March 11, 2021 / Rules and Regulations
December 10, 2020 85 FR 79438. The NPRM was prompted by investigations by the manufacturer following level 1
failures in flight minor anomalies and level 2 failures on the ground minor failures, where cracks were found on the soldered joints of torque conformation boxes. In the NPRM, the FAA proposed to require performing initial and repetitive inspections of the resistance values of the torque conformation box and, depending on the results of the inspections, replacement of the torque conformation box. The FAA is issuing this AD to address the unsafe condition on these products.
The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20190110, dated May 21, 2019
referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:
It was reported that, during investigations following level 1 failures in flight minor anomalies and level 2 failures on the ground minor failures, cracks were found on the soldered joints of certain torque
conformation boxes. Although no events in operation were reported of One Engine Inoperative OEI ratings maximum power unavailability, the failure mode analysis for these boxes demonstrated that such event could not be excluded. This condition, if not detected and corrected, could lead to engine in-flight shut-down, possibly resulting in reduced control of the helicopter.
To address this potential unsafe condition, SAFRAN Helicopter Engines issued the SB
Service Bulletin, to provide instructions for repetitive checks of the box resistance values.
For the reasons described above, this EASA
AD requires repetitive checks of the affected part and, depending on findings, replacement of the affected part with a serviceable part.
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.
FAA20201118.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion 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 products. This AD is adopted as proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Safran Helicopter Engines Mandatory Service Bulletin MSB No. 292 72 2868, Version A, dated December 2018. This service information specifies procedures for performing an inspection of the resistance values of the torque conformation box. 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.
Costs of Compliance The FAA estimates that this AD
affects 257 engines installed on helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:
ESTIMATED COSTS
Action
Labor cost
Inspect resistance values of the torque conformation box.
1 work-hour $85 per hour = $85
The FAA estimates the following costs to do any necessary replacement that would be required based on the
Cost per product
Parts cost
results of the inspections. The agency has no way of determining the number
$0
Cost on U.S.
operators
$85
$21,845
of aircraft that might need this replacement:
ON-CONDITION COSTS
Action
Labor cost
Replace the torque conformation box
1 work-hour $85 per hour = $85
The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals.
khammond on DSKJM1Z7X2PROD with RULES
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.
VerDate Sep<11>2014
16:13 Mar 10, 2021
Jkt 253001
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.
PO 00000
Frm 00004
Fmt 4700
Sfmt 4700
Parts cost $1,841
Cost per product $1,926
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 this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and
E:FRFM11MRR1.SGM
11MRR1
