Federal Register / Vol. 76, No. 215 / Monday, November 7, 2011 / Proposed Rules 68661 

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 

We 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 this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

the DOT Regulatory Policies and 

Procedures (44 FR 11034, February 26, 

1979), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) Will 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 adding 

the following new airworthiness 

directive (AD): 

Pratt & Whitney Division (PW): Docket No. 

FAA–2011–0944; Directorate Identifier 

2011–NE–11–AD. 

Comments Due Date 

(a) We must receive comments by January 

6, 2012. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to all PW PW4050, 

PW4052, PW4056, PW4060, PW4060A, 

PW4060C, PW4062, PW4062A, PW4152, 

PW4156, PW4156A, PW4158, PW4160, 

PW4460, PW4462, and PW4650 turbofan 

engines, including models with any dash 

number suffix. 

Unsafe Condition 

(d) This AD was prompted by an engine 

overspeed event that occurred during taxi 

and resulted in a high-pressure compressor 

surge and tailpipe fire. We are issuing this 

AD to prevent engine overspeed on these 

engines, which could result in an 

uncontained engine failure and damage to 

the airplane. 

Compliance 

(e) Comply with this AD within the 

compliance times specified, unless already 

done. 

Replacement of Fuel Metering Unit (FMU), 

Part Number (P/N) 50U150 

(f) At the next shop visit after the effective 

date of this AD, remove FMU, P/N 50U150, 

and install an FMU that has been modified 

as specified in paragraphs 2.A through 2.C of 

the Accomplishment Instructions of PW 

Alert Service Bulletin PW4ENG A73–220, 

Revision 1, dated May 18, 2011. 

Installation Prohibition 

(g) Three years from the effective date of 

this AD, do not install FMU, P/N 50U150, 

onto any engine. 

Definition of Shop Visit 

(h) For the purpose of this AD, a shop visit 

is when the engine is inducted into the shop 

for any maintenance involving the separation 

of pairs of major mating engine flanges 

(lettered flanges). However, the separation of 

engine flanges solely for the purposes of 

transporting the engine without subsequent 

engine maintenance is not an engine shop 

visit. 

Alternative Methods of Compliance 

(AMOCs) 

(i) The Manager, Engine Certification 

Office, FAA, has the authority to approve 

AMOCs for this AD, if requested using the 

procedures found in 14 CFR 39.19. 

Related Information 

(j) For more information about this AD, 

contact James Gray, Aerospace Engineer, 

Engine Certification Office, FAA, 12 New 

England Executive Park, Burlington, MA 

01803; phone: (781) 238–7742; fax: (781) 

238–7199; email: james.e.gray@faa.gov. 

(k) For service information identified in 

this AD, contact Pratt & Whitney, 400 Main 

St., East Hartford, CT 06108; phone: (860) 

565–8770. You may review copies of the 

referenced service information at the FAA, 

Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 

01803. For information on the availability of 

this material at the FAA, call (781) 238–7125. 

Issued in Burlington, Massachusetts, on 

October 31, 2011. 

Peter A. White, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

[FR Doc. 2011–28676 Filed 11–4–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0889; Directorate 

Identifier 2009–NE–35–AD] 

RIN 2120–AA64 

Airworthiness Directives; Turbomeca 

S.A. Arriel 2B and 2B1 Turboshaft 

Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede an 

existing airworthiness directive (AD) 

that applies to all Turbomeca S.A. Arriel 

2B and 2B1 turboshaft engines. The 

existing AD currently requires checking 

the transmissible torque between the 

low-pressure (LP) pump impeller and 

the high-pressure (HP) pump shaft on 

HP/LP pump hydro-mechanical 

metering units (HMUs) that do not 

incorporate Modification TU 147. Since 

we issued that AD, EASA issued a new 

AD. This proposed AD would require 

inspection and possible replacement of 

the HMU. We are proposing this AD to 

prevent reduced engine power or, at 

worst, an uncommanded in-flight 

shutdown (IFSD), which can result in a 

forced autorotation landing or accident. 

DATES: We must receive comments on 

this proposed AD by January 6, 2012. 

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 

http://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 AD, contact Turbomeca, 40220 

Tarnos, France; phone: 33–05–59–74– 


srobinson on DSK4SPTVN1PROD with PROPOSALS
68662 Federal Register / Vol. 76, No. 215 / Monday, November 7, 2011 / Proposed Rules 

40–00, fax: 33–05–59–74–45–15. You 

may review copies of the referenced 

service information at the FAA, Engine 

& Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803. 

For information on the availability of 

this material at the FAA, call (781) 238– 

7125. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http://www.regulations.

gov; or in person at the Docket 

Management Facility between 

9 a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(phone: (800) 647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

James Rosa, Aerospace Engineer, Engine 

Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: (781) 238–7152; fax: (781) 238– 

7199; email: james.rosa@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2009–0889; Directorate Identifier 

2009–NE–35–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

On January 21, 2010, we issued AD 

2010–03–06, Amendment 39–16189 (75 

FR 5689, February 4, 2010), for all 

Turbomeca Arriel 2B and 2B1 turboshaft 

engines. That AD requires checking the 

transmissible torque between the LP 

pump impeller and the HP pump shaft 

on HMUs that do not incorporate 

Turbomeca Modification TU 147. That 

AD also requires replacing the HMU, if 

it fails that check, with an HMU that has 

not incorporated Modification TU 147 

but passes the check, or with an HMU 

that incorporates Modification TU 147. 

That AD resulted from several events of 

uncoupling of the LP fuel pump 

impeller and the HP fuel pump shaft on 

Arriel 2 engines which do not 

incorporate modification TU 147. The 

uncoupling of the LP fuel pump 

impeller and the HP fuel pump shaft 

may lead to reduced engine power or, at 

worst, an uncommanded IFSD, which 

can result in a forced autorotation 

landing or accident. 

Actions Since Existing AD Was Issued 

Since we issued AD 2010–03–06 (75 

FR 5689, February 4, 2010), three 

additional cases of uncoupling of the LP 

fuel pump impeller and the HP fuel 

pump shaft have been encountered. 

However, these failures were in HMUs 

that were modified to post-TU 147 

configuration HMUs, and the 

investigation indicates that these HMUs 

that fail the transmissible torque check 

must also be replaced. 

Relevant Service Information 

We reviewed Turbomeca Alert 

Mandatory Service Bulletin (MSB) No. 

A292 73 2830, Version B, dated July 10, 

2009, and Alert MSB No. A292 73 2836, 

Version A, dated August 17, 2010. The 

Alert MSBs describe procedures for 

inspecting and replacing the HMU. 

FAA’s Determination 

We are proposing this AD because we 

evaluated all the relevant information 

and determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. 

Proposed AD Requirements 

This proposed AD would require the 

checking of the transmissible torque 

between the LP pump impeller and the 

HP pump shaft on HMUs. This 

proposed AD would also require 

replacing the HMU if it fails the 

transmissible torque check, with an 

HMU that is eligible for installation. 

Costs of Compliance 

Based on the service information, we 

estimate that this proposed AD would 

affect about 540 engines installed on 

helicopters of U.S. registry. We also 

estimate that it would take about 2.5 

work-hours per engine to comply with 

this proposed AD. The average labor 

rate is $85 per work-hour. Replacement 

HMUs would cost about $12,000 per 

engine. Based on these figures, if all of 

the HMUs were to fail the check, we 

estimate the cost of the proposed AD on 

U.S. operators to be $6,594,750. 

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. 

We are 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 

We have 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) Is not a ‘‘significant rule’’ under 

the DOT Regulatory Policies and 

Procedures (44 FR 11034, February 26, 

1979), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) Will 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. 


srobinson on DSK4SPTVN1PROD with PROPOSALS
Federal Register / Vol. 76, No. 215 / Monday, November 7, 2011 / Proposed Rules 68663 

§ 39.13 [Amended] 

2. The FAA amends § 39.13 by 

removing airworthiness directive (AD) 

2010–03–06, Amendment 39–16189 (75 

FR 5689, February 4, 2010), and adding 

the following new AD: 

Turbomeca S.A.: Docket No. FAA–2009– 

0889; Directorate Identifier 2009–NE– 

35–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

AD action by January 6, 2012. 

(b) Affected ADs 

This AD supersedes AD 2010–03–06, 

Amendment 39–16189 (75 FR 5689, February 

4, 2010). 

(c) Applicability 

This AD applies to all Turbomeca S.A. 

Arriel 2B and 2B1 turboshaft engines. 

(d) Unsafe Condition 

This AD was prompted by three additional 

cases of uncoupling of the high-pressure/lowpressure (HP/LP) pump hydro-mechanical 

metering unit (HMU) LP fuel pump impeller 

and the HP fuel pump shaft, since AD 2010– 

03–06 (75 FR 5689, February 4, 2010) was 

issued. However, these failures were in 

HMUs that were modified to post-TU 147 

configuration HMUs. The investigation 

indicates that these HMUs may also need to 

be replaced. We are issuing this AD to 

prevent reduced engine power or, at worst, 

an uncommanded in-flight shutdown, which 

can result in a forced autorotation landing or 

accident. 

(e) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(1) Check the transmissible torque between 

the LP fuel pump impeller and the HP fuel 

pump shaft as follows: 

(i) For HMUs that do not incorporate 

Modification TU 147, check the torque before 

accumulating 500 engine flight hours (EFH) 

since March 11, 2010 (the effective date of 

AD 2010–03–06 (75 FR 5689, February 4, 

2010)). Use Paragraph 2 of Turbomeca Alert 

Mandatory Service Bulletin (MSB) No. A292 

73 2830, Version B, dated July 10, 2009, to 

do the check. 

(ii) For HMUs that incorporate 

Modification TU 147 and which Modification 

TU 147 was applied on or before March 31, 

2010, and the HMUs are not listed in Figures 

2 or 3 of Turbomeca Alert MSB No. A292 73 

2836, Version A, dated August 17, 2010, 

check the torque within 750 EFH from the 

effective date of this AD, but no later than 14 

months after the effective date of this AD. 

Use Paragraph 2 of Turbomeca Alert MSB 

No. A292 73 2836, Version A, dated August 

17, 2010, to do the check. 

(2) If the HMU does not pass the torque 

check, then replace the HMU with an HMU 

that is eligible for installation. 

(f) HMU Reinstallation 

Do not install any HMU removed from 

service by this AD until it has been checked 

in accordance with Paragraph 2 of 

Turbomeca Alert MSB No. A292 73 2836, 

Version A, dated August 17, 2010, or checked 

in accordance with Paragraph 2 of 

Turbomeca Alert MSB No. A292 73 2830, 

Version B, dated July 10, 2009, and found 

eligible for installation. 

(g) Alternative Methods of Compliance 

(AMOCs) 

The Manager, Engine Certification Office, 

FAA, has the authority to approve AMOCs 

for this AD, if requested using the procedures 

found in 14 CFR 39.19. 

(h) Related Information 

(1) For more information about this AD, 

contact James Rosa, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: (781) 238–7152; fax: (781) 238–7199; 

email: james.rosa@faa.gov. 

(2) For service information identified in 

this AD, contact Turbomeca S.A., 40220 

Tarnos, France; phone: 33–05–59–74–40–00, 

fax: 33–05–59–74–45–15. You may review 

copies of the referenced service information 

at the FAA, Engine & Propeller Directorate, 

12 New England Executive Park, Burlington, 

MA 01803. For information on the 

availability of this material at the FAA, call 

(781) 238–7125. 

Issued in Burlington, Massachusetts, on 

October 28, 2011. 

Peter A. White, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

[FR Doc. 2011–28677 Filed 11–4–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0755; Directorate 

Identifier 2010–NE–12–AD] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

plc (RR) RB211–Trent 800 Series 

Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental notice of 

proposed rulemaking (NPRM); 

reopening of comment period. 

SUMMARY: We are revising an earlier 

proposed airworthiness directive (AD) 

for RR RB211–Trent 800 series turbofan 

engines. That NPRM proposed to revise 

the Trent 800 Time Limits Manual 

(TLM) of the Trent 800 engine 

maintenance manuals (EMMs). That 

NPRM was prompted by RR reducing 

the life limits of certain critical engine 

parts. This action revises that NPRM by 

proposing to supersede an existing AD 

to prohibit installation of one certain 

critical part and to increase the life of 

another critical part whose lives were 

previously reduced by that existing AD. 

We are proposing this supplemental 

NPRM to prevent the failure of critical 

rotating parts, which could result in 

uncontained failure of the engine and 

damage to the airplane. Because of the 

extensive changes since the NPRM was 

issued, we are reopening the comment 

period to allow the public the chance to 

comment on these proposed changes. 

DATES: We must receive comments on 

this proposed AD by January 6, 2012. 

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 

http://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: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE., Washington, DC 20590, 

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

through Friday, except Federal holidays. 

For service information identified in 

this AD, contact Rolls-Royce plc, 

Corporate Communications, P.O. Box 

31, Derby, England, DE248BJ; phone: 

011–44–1332–242424; fax: 011–44– 

1332–245418 or email from http:// 

www.rolls-royce.com/contact/ 

civil_team.jsp, or download the 

publication from https://www.

aeromanager.com. You may review 

copies of the referenced service 

information at the FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA. For 

information on the availability of this 

material at the FAA, call (781)–238– 

7125. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http://www.regulations.

gov; or in person at the Docket 

Management Facility between 

9 a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(phone: (800) 647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Alan Strom, Aerospace Engineer, Engine 


srobinson on DSK4SPTVN1PROD with PROPOSALS