This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

52106 

Vol. 86, No. 179 

Monday, September 20, 2021 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0793; Project 

Identifier MCAI–2021–00372–E] 

RIN 2120–AA64 

Airworthiness Directives; Safran 

Helicopter Engines, S.A. (Type 

Certificate Previously Held by 

Turbomeca S.A.) Turboshaft Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2005–12–08, which applies to Safran 

Helicopter Engines, S.A. (Safran 

Helicopter Engines) Arrius 2B1, 2B1A, 

2B1A–1, and 2B2 model turboshaft 

engines. AD 2005–12–08 requires 

replacing the software in the engine 

electronic control unit (EECU). Since 

the FAA issued AD 2005–12–08, the 

manufacturer determined that certain 

previously affected EECUs are not 

subject to the unsafe condition 

identified in AD 2005–12–08. This 

proposed AD would retain the 

requirements of AD 2005–12–08 for 

engines with a certain EECU part 

number (P/N) installed. This proposed 

AD would also prohibit installation of 

an affected EECU onto any engine. The 

FAA is proposing this AD to address the 

unsafe condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by November 4, 

2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this NPRM, contact Safran Helicopter 

Engines, S.A., Avenue du 1er Mai, 

40220 Tarnos, France; phone: +33 (0) 5 

59 74 45 00. You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 1200 District Avenue, 

Burlington, MA 01803. For information 

on the availability of this material at the 

FAA, call (781) 238–7759. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0793; or in person at Docket 

Operations between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. The AD docket contains this 

NPRM, the mandatory continuing 

airworthiness information (MCAI), any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Wego Wang, Aviation Safety Engineer, 

ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: 

(781) 238–7134; fax: (781) 238–7199; 

email: wego.wang@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposed AD. 

Send your comments to an address 

listed under ADDRESSES. Include 

‘‘Docket No. FAA–2021–0793; Project 

Identifier MCAI–2021–00372–E’’ 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 the 

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 we receive about this proposed 

AD. 

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 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 FAA issued AD 2005–12–08, 

Amendment 39–14124 (70 FR 34334, 

June 14, 2005), (AD 2005–12–08), for all 

Turbomeca S.A. (Turbomeca) Arrius 

2B1, 2B1A, 2B1A–1, and 2B2 model 

turboshaft engines. AD 2005–12–08 was 

prompted by a report of simultaneous 

loss of automatic control of both engines 

of an Airbus Helicopters Deutschland 

(formerly Eurocopter Deutschland) 

EC135 helicopter during flight. AD 

2005–12–08 requires replacing the 

software in the EECU. The agency 

issued AD 2005–12–08 to prevent 

simultaneous loss of automatic control 

of both engines and subsequent loss of 

control of the helicopter. 

Actions Since AD 2005–12–08 Was 

Issued 

Since the FAA issued AD 2005–12– 

08, the European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Community, has issued EASA 

AD 2021–0088, dated March 24, 2021. 

Federal Register / Vol. 86, No. 179 / Monday, September 20, 2021 / Proposed Rules 52107 

EASA AD 2021–0088 was revised by 

EASA AD 2021–0088R1, dated July 26, 

2021 (EASA AD 2021–0088R1) (referred 

to after this as ‘‘the MCAI’’), to address 

the unsafe condition on these products. 

The MCAI states: 

An occurrence was reported of 

simultaneous loss of automatic control in 

flight of both ARRIUS 2B1 engines on an 

EC135 T1 helicopter. Loss of automatic 

control would result, for each engine, from a 

difference between the position datum of the 

fuel metering valve and its measured 

position. 

This condition, if not corrected, could lead 

to increased work for flight crew during 

certain flight phases, possibly resulting in 

reduced control of the helicopter. 

To address this potential unsafe condition, 

Turbome ́ca developed mod TU80C, TU81C, 

TU82C and TU90C to improve the DECU 

software for ARRIUS 2B1 engines without 

overspeed option, ARRIUS 2B1 engines with 

overspeed option, ARRIUS 2B1A and 

ARRIUS 2B2 engines, and DGAC France 

issued AD F–2004–017 (later revised) to 

require engine modification. 

Since that [DGAC France] AD was issued, 

it was determined that a DECU having a 

P/N which corresponds to Turbome ́ca mod 

TU80C, TU81C, TU82C, TU90C or later 

software is not affected by the software 

modification requirement. DGAC France AD 

F–2004–017R1 did not specifically identify 

any affected DECU P/N(s). 

For the reason described above, this 

[EASA] AD retains the requirements of DGAC 

France AD F–2004–017R1 (EASA approval 

2004–1618), which is superseded, and limits 

the required actions to engines with an 

affected DECU P/N installed. This [EASA] 

AD also prohibits (re)installation of affected 

DECU on any engine. 

This [EASA] AD is revised to provide 

clarification on affected and serviceable 

DECU. 

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. 

FAA–2021–0793. 

In addition, Turbomeca issued 

Mandatory Service Bulletin (MSB) No. 

319 73 2082, Version D, dated June 6, 

2011. The manufacturer discovered an 

error in Version C of the MSB and 

determined that the requirement to 

replace the EECU or upgrade the EECU 

software should be applicable to only 

engines with a certain EECU P/N 

installed. 

FAA’s 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 the FAA 

of the unsafe condition described in the 

MCAI and service information. The 

FAA is issuing this NPRM 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 Turbomeca 

Mandatory Service Bulletin (MSB) No. 

319 73 2080, Update No. 1, dated 

February 13, 2004; Turbomeca MSB No. 

319 73 2081, Update No. 1, dated 

February 13, 2004; Turbomeca MSB No. 

319 73 2082, Update No. 1, dated 

February 13, 2004, Version C, dated July 

31, 2008, and Version D, dated June 6, 

2011; and Turbomeca MSB No. 319 73 

2090, Original Issue, dated February 13, 

2004. This service information specifies 

procedures for upgrading the EECU by 

either replacing the EECU or by 

uploading the software to the EECU. 

These documents are distinct since they 

apply to different engine models in 

different configurations. The Director of 

the Federal Register previously 

approved Turbomeca MSB No. 319 73 

2080, Update No. 1, dated February 13, 

2004; Turbomeca MSB No. 319 73 2081, 

Update No. 1, dated February 13, 2004; 

Turbomeca MSB No. 319 73 2082, 

Update No. 1, dated February 13, 2004; 

and Turbomeca MSB No. 319 73 2090, 

Original Issue, dated February 13, 2004 

for incorporation by reference on June 

29, 2005 (70 FR 34334, June 14, 2005). 

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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would retain all 

the requirements of AD 2005–12–08. 

This proposed AD would require 

replacement of the EECU or upgrade of 

the EECU software for engines with a 

certain EECU P/N installed. This 

proposed AD would also prohibit 

installation of an affected EECU onto 

any engine. 

Differences Between the Proposed AD 

and MCAI or Service Information 

EASA AD 2021–0088R1, dated July 

26, 2021, uses the term digital engine 

control unit (DECU), whereas the 

Turbomeca MSBs and this proposed AD 

use EECU. These terms refer to the same 

part. 

Turbomeca MSB No. 319 73 2080, 

Update No. 1, dated February 13, 2004; 

Turbomeca MSB No. 319 73 2081, 

Update No. 1, dated February 13, 2004; 

Turbomeca MSB No. 319 73 2082, 

Update No. 1, dated February 13, 2004, 

Version C, dated July 31, 2008, and 

Version D, dated June 6, 2011; and 

Turbomeca MSB No. 319 73 2090, 

Original Issue, dated February 13, 2004, 

instruct operators to notify Turbomeca 

that the EECUs have been replaced by 

returning the completed compliance 

certificate. This proposed AD would not 

mandate returning the completed 

compliance certificate to Turbomeca. 

EASA AD 2021–0088R1 and the 

Turbomeca service information 

reference Arrius 2B1A_1 or Arrius 

2B1A–1 model turboshaft engines, 

whereas this AD references Arrius 2B1A 

model turboshaft engines. Arrius 2B1A_

1 model turboshaft engines are Arrius 

2B1A model turboshaft engines with 

modification (mod) TU45C. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 221 

engines installed on helicopters of U.S. 

registry. 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Replace the EECU .......................................... 1 work-hour × $85 per hour = $85 ................. $35,000 $35,085 $7,753,785 

Upgrade the EECU software .......................... 2 work-hours × $85 per hour = $170 ............. 0 170 37,570 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s 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 Agency’s 

authority. 

52108 Federal Register / Vol. 86, No. 179 / Monday, September 20, 2021 / Proposed Rules 

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. 

Regulatory Findings 

The FAA has determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would 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 that the proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by: 

■ a. Removing Airworthiness Directive 

2005–12–08, Amendment 39–14124 (70 

FR 34334, June 14, 2005); and 

■ b. Adding the following new 

airworthiness directive: 

Safran Helicopter Engines, S.A. (Type 

Certificate previously held by 

Turbomeca S.A.): Docket No. FAA– 

2021–0793; Project Identifier MCAI– 

2021–00372–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by November 4, 

2021. 

(b) Affected ADs 

This AD replaces AD 2005–12–08, 

Amendment 39–14124 (70 FR 34334, June 

14, 2005) (AD 2005–12–08). 

(c) Applicability 

This AD applies to Safran Helicopter 

Engines, S.A. (Type Certificate previously 

held by Turbomeca S.A.) Arrius 2B1, Arrius 

2B1A, (including those that embody 

modification (mod) TU45C, identified as 

Arrius 2B1A_1) and Arrius 2B2 model 

turboshaft engines with an installed engine 

electronic control unit (EECU) having part 

number (P/N) 70EMF01080 or 

70EMF01090—for Arrius 2B1 model 

turboshaft engines without overspeed 

protection option (TU 19C); P/N 

70EMF01100 or P/N 70EMF01120—for 

Arrius 2B1 model turboshaft engines with 

overspeed protection option (TU 67C or TU 

23C); P/N 70EMH01000 or 70EMH01010—for 

Arrius 2B1A model turboshaft engines; or 

P/N 70EMM01000—for Arrius 2B2 model 

turboshaft engines. 

Note 1 to paragraph (c): Turbomeca 

Mandatory Service Bulletin (MSB) No. 319 

73 2082, Version D, dated June 6, 2011, 

references Arrius 2B1A_1 model turboshaft 

engines. Arrius 2B1A model turboshaft 

engines with mod TU 45C applied are 

identified as Arrius 2B1A_1 on the engine 

identification plate. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7600, Engine Controls. 

(e) Unsafe Condition 

This AD was prompted by a report of 

simultaneous loss of automatic control of 

both engines of an Airbus Helicopters 

Deutschland (formerly Eurocopter 

Deutschland) EC135 helicopter during flight. 

The FAA is issuing this AD to prevent 

simultaneous loss of automatic control of 

both engines. The unsafe condition, if not 

addressed, could result in failure of the 

engines and loss of control of the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) For engines with an EECU having P/N 

70EMF01090, 70EMF01100, 70EMF01120, 

70EMH01010, or 70EMM01000, within 90 

days after June 29, 2005 (the effective date of 

AD 2005–12–08), or before further flight, 

whichever occurs later, upload the EECU 

software on both engines of the helicopter 

simultaneously using paragraph 2, 

Instructions to be incorporated, of the 

applicable Turbomeca MSB listed in Table 1 

to paragraph (g) of this AD, or replace the 

EECU with a part eligible for installation. 

(2) For engines with an EECU having P/N 

70EMF01080 or 70EMH01000, within 90 

days after June 29, 2005 (the effective date of 

AD 2005–12–08), or before further flight, 

whichever occurs later, replace the affected 

EECU with a part eligible for installation. 

Federal Register / Vol. 86, No. 179 / Monday, September 20, 2021 / Proposed Rules 52109 

(h) Installation Prohibition 

After the effective date of this AD, do not 

install onto any engine any EECU having a 

P/N identified in paragraph (c) of this AD. 

(i) Definition 

For the purpose of this AD, a ‘‘part eligible 

for installation’’ is an EECU having a P/N that 

is not identified in paragraph (c) of this AD. 

(j) No Reporting Requirements 

The reporting requirements specified in 

Turbomeca MSB No. 319 73 2080, Update 

No. 1, dated February 13, 2004; Turbomeca 

MSB No. 319 73 2081, Update No. 1, dated 

February 13, 2004; Turbomeca MSB No. 319 

73 2082, Update No. 1, dated February 13, 

2004, Version C, dated July 31, 2008, and 

Version D, dated June 6, 2011; and 

Turbomeca MSB No. 319 73 2090, Original 

Issue, dated February 13, 2004, are not 

required by this AD. 

(k) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, ECO Branch, FAA, has 

the authority to approve AMOCs for this AD, 

if requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the certification office, 

send it to the attention of the person 

identified in paragraph (l)(1) of this AD. 

Information may be emailed to: ANE-ADAMOC@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(l) Related Information 

(1) For more information about this AD, 

contact Wego Wang, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7134; fax: (781) 238–7199; email: 

wego.wang@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2021–0088R1, 

dated July 26, 2021, for more information. 

You may examine the EASA AD in the AD 

docket at https://www.regulations.gov by 

searching for and locating it in Docket No. 

FAA–2021–0793. 

(3) For service information identified in 

this AD, contact Safran Helicopter Engines, 

S.A., Avenue du 1er Mai, 40220 Tarnos, 

France; phone: +33 (0) 5 59 74 45 00. You 

may view this referenced service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (781) 238–7759. 

Issued on September 14, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–20230 Filed 9–17–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0783; Project 

Identifier 2019–SW–009–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bell Textron 

Canada Limited (Type Certificate 

Previously Held by Bell Helicopter 

Textron Canada Limited) Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Bell Textron Canada Limited 

(type certificate previously held by Bell 

Helicopter Textron Canada Limited) 

Model 505 helicopters. This proposed 

AD was prompted by the determination 

that reducing the pressure altitude 

limitations for certain fuel types is 

necessary. This proposed AD would 

require revising the existing Rotorcraft 

Flight Manal (RFM) for your helicopter. 

The FAA is proposing this AD to 

address the unsafe condition on these 

products. 

DATES: The FAA must receive comments 

on this proposed AD by November 4, 

2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. 

For service information identified in 

this NPRM, contact Bell Textron Canada 

Limited, 12,800 Rue de l’Avenir, 

Mirabel, Quebec J7J 1R4, Canada; 

telephone 1–450–437–2862 or 1–800– 

363–8023; fax 1–450–433–0272; email 

productsupport@bellflight.com; or at 

https://www.bellflight.com/support/ 

contact-support. You may view this 


EP20SE21.000</GPH>

Table 1 to paragraph (g) - Applicable MSBs 

ForArrius 2B 1 engines with EECUs that 

have incorporated Modification TU 19C 

Arrius 2B 1 engines with EECUs that 

have incorporated Modification TU 67C 

orTU23C 

Arrius 2B IA and 2B lAl _ 1 engines 

Arrius 2B2 engines 

UseTurbomecaMSB No. 319 73 2080, 

Update No. 1, dated February 13, 2004 

TurbomecaMSB No. 319 73 2081, 

Update No. 1, dated February 13, 2004 

TurbomecaMSB No. 319 73 2082, 

Update No. 1, dated February 13, 2004, 

Version C, dated July 31, 2008, or 

Version D, dated June 6, 2011 

Turbomeca MSB No. 319 73 2090, 

Original Issue, dated February 13, 2004