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Federal Register / Vol. 86, No. 53 / Monday, March 22, 2021 / Proposed Rules Jon Jordan, Rotorcraft Flight Test Pilot, Southwest Section, Flight Test Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 222
5110; email jon.jordan@faa.gov.

FOR FURTHER INFORMATION CONTACT:

SUPPLEMENTARY INFORMATION:

Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20170432; Project Identifier 2013SW074AD at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.

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Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Jon Jordan, Rotorcraft Flight Test Pilot, Southwest Section, Flight Test Branch, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email jon.jordan@faa.gov. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

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Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20130287, dated December 5, 2013
EASA AD 20130287, to correct an unsafe condition for Eurocopter formerly Eurocopter France, Aerospatiale Model AS 350 B3 and EC
130 T2 helicopters with an ARRIEL 2D
engine and THALES full authority digital engine control FADEC part number P/N C13165DA00 or P/N
C13165FA00 installed. The EASA
advises of a report of an in-flight event where the pilot noticed that the temporary amber governor GOV light had illuminated, followed by the failure of the vehicle engine monitoring display VEMD screens, and no availability of the automatic or auxiliary engine backup control ancillary unit EBCAU.
Subsequent investigation identified an internal failure of the engine DECU, which led to loss of fuel flow regulation frozen fuel metering unit. This failure was not indicated to the pilot by a red GOV warning light as expected, but with amber GOV indication and loss of VEMD display instead. EASA also advises that if this fuel metering unit is frozen in the open position, it may lead to a rotor overspeed, and if it is frozen in the closed position, it may lead to unavailability of engine power. EASA
states that this condition, if not addressed, could result in the pilot identifying the type of failure condition incorrectly, possibly resulting in an improper response.
Accordingly, and pending the development of a DECU assembly design improvement, the EASA AD
requires incorporating a new procedure into the Emergency Procedures section of the RFM and informing all flight crews of the RFM change. EASA
considers its AD an interim action and states that further AD action may follow.
After EASA issued EASA AD 2013
0287, EASA issued SIB No. 201323, dated December 19, 2013, for Eurocopter AS 350 B3 and EC 130 T2
helicopters with a Turbomeca ARRIEL
2D engine installed. The SIB
recommends modifying certain EECUs.
FAAs Determination 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 is proposing this AD after evaluating all known relevant information and determining that the unsafe condition
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described previously is likely to exist or develop on other helicopters of the same type designs.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB No.
AS35001.00.67 and ASB No. EC130
04A004, each Revision 2 and dated February 17, 2014 ASB AS350
01.00.67 and ASB EC13004A004. ASB
AS35001.00.67 applies to Model AS350B3 helicopters and ASB EC130
04A004 applies to Model EC130T2
helicopters. This service information provides a new RFM procedure in the event of illumination of the amber GOV
followed by the loss of the VEMD
display.
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 Safran Turbomeca Mandatory Service Bulletin No. 292 73
2852, Revision B, dated February 12, 2014. This service information specifies replacing certain FADEC D EECUs with certain amended FADEC D EECUs.
Proposed AD Requirements in This NPRM
This proposed AD would require revising the Emergency Procedures of the existing RFM for your helicopter by inserting Appendix 4. of ASB AS350
01.00.67 or ASB EC13004A004, or a different document with information identical to that in Appendix 4., as applicable to your helicopter model.
As an optional terminating action for the RFM revision, this proposed AD
would allow installing amendment A on FADEC P/N C13165DA00 or amendment B on FADEC P/N
C13165FA00.
Differences Between This Proposed AD
and the EASA AD
The EASA AD applies to Model AS350B3 and EC130T2 helicopters, with an ARRIEL 2D engine and THALES
FADEC P/N C13165DA00 or P/N
C13165FA00 installed, whereas this proposed AD would apply to those helicopters except not those with THALES FADEC P/N C13165DA00 with amendment A or P/N C13165FA00 with amendment B installed. This proposed AD would also allow installing those amendments on the FADEC as an optional termination action, whereas the EASA AD does not.

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