77614 Federal Register / Vol. 78, No. 247 / Tuesday, December 24, 2013 / Proposed Rules 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2007–27009; Directorate 

Identifier 2007–NE–02–AD] 

RIN 2120–AA64 

Airworthiness Directives; Turbomeca 

S.A. Turboshaft Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede 

airworthiness directive (AD) 2007–19– 

09R1 that applies to Turbomeca S.A. 

Arriel 2B1 turboshaft engines that do 

not have modification TU157 

incorporated. AD 2007–19–09R1 

requires replacement of the 

hydromechanical metering unit (HMU) 

with a serviceable HMU. Since we 

issued AD 2007–19–09R1, we received 

reports of ruptures on HMU constant 

delta pressure valves that have less than 

2,000 hours in service. This proposed 

AD would continue to require HMU 

replacement; reduce the compliance 

interval; and include the power turbine 

(C2) cycle consumption rate when 

determining compliance times. We are 

proposing this AD to prevent failure of 

the HMU, which could lead to damage 

to the engine, and damage to the 

aircraft. 

DATES: We must receive comments on 

this proposed AD by February 24, 2014. 

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, S.A., 40220 

Tarnos, France; phone: 33 (0)5 59 74 40 

00; telex: 570 042; fax: 33 (0)5 59 74 45 

15. You may view this 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 by searching for 

and locating Docket No. FAA–2007– 

27009; 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 MCAI, 

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: 

Frederick Zink, Aerospace Engineer, 

Engine Certification Office, FAA, Engine 

& Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: 781–238–7779; fax: 781–238– 

7199; email: frederick.zink@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–2007–27009; Directorate Identifier 

2007–NE–02–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 May 24, 2010, we issued AD 

2007–19–09R1, Amendment 39–16322 

(75 FR 30687, June 2, 2010). That AD 

applies to all Turbomeca S.A. 2B1 

turboshaft engines that do not 

incorporate modification TU157. That 

AD requires replacement of the HMU 

with a serviceable HMU. AD 2007–19– 

09R1 resulted from reports of HMU 

valve rupture. We issued AD 2007–19– 

09R1 to prevent failure of the HMU, 

which could lead to damage to the 

engine and damage to the aircraft. 

Actions Since Existing AD Was Issued 

Since we issued AD 2007–19–09R1, 

Amendment 39–16322 (75 FR 30687, 

June 2, 2010), we received reports of 

ruptures on HMU constant delta 

pressure valves that have less than 2,000 

hours in service. Also since we issued 

AD 2007–19–09R1, the European 

Aviation Safety Agency has issued AD 

2013–0171, dated July 30, 2013, which 

reintroduces a requirement for periodic 

replacement of 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 retain 

certain requirements of AD 2007–19– 

09R1, Amendment 39–16322 (75 FR 

30687, June 2, 2010) but would reduce 

the compliance interval and include the 

C2 cycle consumption rate when 

determining compliance times. 

Costs of Compliance 

We estimate that this proposed AD 

affects 264 engines installed on aircraft 

of U.S. registry. We also estimate that it 

would take about 1 hour per engine to 

comply with this proposed AD. The 

average labor rate is $85 per hour. Parts 

cost about $5,000 per engine. Based on 

these figures, we estimate the cost of 

this proposed AD on U.S. operators to 

be $1,342,440. 

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 proposed 

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 


sroberts on DSK5SPTVN1PROD with PROPOSALS
Federal Register / Vol. 78, No. 247 / Tuesday, December 24, 2013 / Proposed Rules 77615 

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 to the extent that it justifies 

making a regulatory distinction, 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD and placed it in the 

AD docket. 

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 

removing airworthiness directive (AD) 

2007–19–09R1, Amendment 39–16322 

(75 FR 30687, June 2, 2010), and adding 

the following new AD: 

Turbomeca S.A.: Docket No. FAA–2007– 

27009; Directorate Identifier 2007–NE– 

02–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

AD action by February 24, 2014. 

(b) Affected ADs 

This AD supersedes AD 2007–19–09R1, 

Amendment 39–16322 (75 FR 30687, June 2, 

2010). 

(c) Applicability 

This AD applies to Turbomeca S.A. Arriel 

2B1 turboshaft engines that do not have 

modification TU157 incorporated. 

(d) Unsafe Condition 

This AD was prompted by reports of 

ruptures on hydromechanical metering unit 

(HMU) constant delta pressure valves that 

have less than 2,000 hours in service. We are 

issuing this AD to prevent failure of the 

HMU, which could lead to damage to the 

engine and damage to the aircraft. 

(e) Compliance 

Within the compliance times specified, 

replace the HMU with a part eligible for 

installation, unless already done. 

(1) HMU Operating Hours and Power 

Turbine (C2) Cycles Are Known. 

(i) If on the effective date of this AD, the 

HMU C2 cycles are less than 900, then 

replace the HMU before the HMU 

accumulates 1,000 C2 cycles or 1,500 HMU 

operating hours, whichever occurs first; 

(ii) If on the effective date of this AD, the 

HMU C2 cycles are 900 or more, then replace 

the HMU within 100 HMU C2 cycles after the 

effective date of this AD; 

(iii) Thereafter, replace the HMU at every 

1,000 HMU C2 cycles or 1,500 HMU 

operating hours, whichever comes first. 

(2) HMU Operating Hours Are Known and 

C2 Cycles Are Not Known. 

(i) If on the effective date of this AD, the 

HMU operating hours are less than 1,100, 

then replace the HMU before accumulating 

1,200 HMU operating hours; 

(ii) If on the effective date of this AD, the 

HMU operating hours are 1,100 or more, then 

replace the HMU within 100 HMU operating 

hours after the effective date of this AD; 

(iii) Thereafter, replace HMUs at every 

1,200 HMU operating hours. 

(f) Definition 

For the purposes of this AD, ‘‘HMU 

operating hours’’ or ‘‘C2 cycles’’ are defined 

as operating hours or C2 cycles since new, 

since overhaul, or since application of 

Turbomeca S.A. Service Bulletin (SB) No. 

292 73 2105, Version B, dated December 16, 

2010, or earlier version, or of Turbomeca S.A. 

Mandatory SB (MSB) No. 292 73 2818, 

Version D, dated June 24, 2013, or earlier 

version, whichever occurs later. 

(g) Optional Terminating Action 

Incorporation of Turbomeca S.A. SB No. 

292 73 2157, Version C, dated July 17, 2013, 

or earlier version, is terminating action to the 

replacement and repetitive inspection 

requirements of this AD. 

(h) Credit for Previous Actions 

If you performed the actions required by 

paragraphs (e)(1) or (e)(2) of this AD using an 

earlier version of Turbomeca S.A. MSB No. 

292 73 2818, Version D, dated June 24, 2013, 

you met the requirements of this AD. 

However, you must still repetitively replace 

the HMU as required by paragraphs (e)(1)(iii) 

and (e)(2)(iii) of this AD. 

(i) Alternative Methods of Compliance 

(AMOCs) 

The Manager, Engine Certification Office, 

FAA, may approve AMOCs to this AD. Use 

the procedures found in 14 CFR 39.19 to 

make your request. 

(j) Related Information 

(1) For more information about this AD, 

contact Frederick Zink, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: 781–238–7779; fax: 781–238–7199; 

email: frederick.zink@faa.gov. 

(2) Refer to MCAI European Aviation 

Safety Agency Airworthiness Directive 2013– 

0171, dated July 30, 2013. You may examine 

the AD on the Internet at http://

www.regulations.gov by searching for and 

locating it in Docket No. FAA–2007–27009. 

(3) Turbomeca S.A. MSB No. 292 73 2818, 

Version D, dated June 24, 2013 and 

Turbomeca S.A. SB No. 292 73 2157, Version 

C, dated July 17, 2013, and Turbomeca S.A. 

SB No. 292 73 2105, Version B, dated 

December 16, 2010, pertain to the subject of 

this AD and can be obtained from Turbomeca 

S.A. using the contact information in 

paragraph (j)(4) of this AD. 

(4) For service information identified in 

this AD, contact Turbomeca, S.A., 40220 

Tarnos, France; phone: 33 (0)5 59 74 40 00; 

telex: 570 042; fax: 33 (0)5 59 74 45 1. 

(5) You may view this 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. 

Issued in Burlington, Massachusetts, on 

December 11, 2013. 

Robert J. Ganley, 

Acting Assistant Directorate Manager, Engine 

& Propeller Directorate, Aircraft Certification 

Service. 

[FR Doc. 2013–30488 Filed 12–23–13; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–1029; Directorate 

Identifier 2013–NM–177–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede 

airworthiness directive (AD) 2010–13– 

04, which applies to certain 

Bombardier, Inc. Model DHC–8–400 

series airplanes. AD 2010–13–04 

requires modifying the nose landing 

gear (NLG) trailing arm. Since we issued 

AD 2010–13–04, we received a report of 

several missing or damaged pivot pin 

retention bolts. This proposed AD 

would require installing a new pivot pin 

retention mechanism. This proposed AD 

would also add airplanes to the 

applicability. We are proposing this AD 

to prevent failure of the pivot pin 

retention bolt, which could result in a 


sroberts on DSK5SPTVN1PROD with PROPOSALS