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

32500 

Vol. 79, No. 108 

Thursday, June 5, 2014 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0072; Directorate 

Identifier 2013–NE–04–AD] 

RIN 2120–AA64 

Airworthiness Directives; Pratt & 

Whitney Division Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede 

airworthiness directive (AD) 2013–15– 

09, which applies to all Pratt & Whitney 

Division (PW) PW4074, PW4074D, 

PW4077, PW4077D, PW4084D, 

PW4090, and PW4090–3 turbofan 

engine models with certain second-stage 

high-pressure turbine (HPT) air seals, 

installed. AD 2013–15–09 currently 

requires initial and repetitive 

inspections for cracks in second-stage 

HPT air seals. Since we issued AD 

2013–15–09, we received reports of 

cracking in the original location on two 

additional part numbers (P/Ns) as well 

as reports of through-cracks in a new 

location in the second-stage HPT air 

seal. PW has developed a redesigned 

second-stage HPT air seal that addresses 

the cracking condition in both locations. 

This proposed AD would expand the 

applicability of AD 2013–15–09 to 

include additional P/Ns, require 

replacement of the mating hardware if 

the second-stage HPT air seal is found 

with a through-crack, and add 

mandatory terminating action to the 

repetitive inspections. We are proposing 

this AD to prevent failure of the secondstage HPT air seal, which could lead to 

uncontained engine failure and damage 

to the airplane. 

DATES: We must receive comments on 

this proposed AD by August 4, 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 proposed AD, contact Pratt & 

Whitney Division, 400 Main St., East 

Hartford, CT 06108; phone: (860) 565– 

8770; fax: (860) 565–4503. 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–2013– 

0072; 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 Gray, Aerospace Engineer, Engine 

Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

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

7199; email: james.e.gray@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–2013–0072; Directorate Identifier 

2013–NE–04–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 July 19, 2013, we issued AD 2013– 

15–09, Amendment 39–17525 (78 FR 

49111, August 13, 2013), (‘‘AD 2013– 

15–09’’), for all PW PW4074, PW4074D, 

PW4077, PW4077D, PW4084D, 

PW4090, and PW4090–3 turbofan 

engine models with second-stage HPT 

air seal, P/N 54L041, installed. AD 

2013–15–09 requires initial and 

repetitive inspections for cracks in 

second-stage HPT air seals and 

replacement of air seals that fail 

inspection. AD 2013–15–09 resulted 

from the discovery of cracks in secondstage HPT air seals. We issued AD 

2013–15–09 to prevent failure of the 

second-stage HPT air seal, which could 

lead to uncontained engine failure and 

damage to the airplane. 

Actions Since AD 2013–15–09 Was 

Issued 

Since we issued AD 2013–15–09, we 

received multiple reports of throughcracks in a different location on secondstage HPT air seal, P/N 50L041, and 

reports of cracking in the original 

location in two additional second-stage 

HPT air seal P/Ns, 50L960 and 50L976. 

The cracking in the two additional P/Ns 

requires that they be added to the 

applicability of this proposed AD. PW 

has developed a redesigned secondstage HPT air seal that corrects the 

cracking condition in both locations. 

The new cracking location in the 

second-stage HPT air seal, P/N 50L041, 

is in the front forward fillet radius. PW 

determined that through-cracks in the 

front forward fillet radius increase the 

stresses in the mating hardware in the 

HPT rotor and that increased stress 

reduces the life of the first-stage HPT 

hub, second-stage HPT hub, and secondstage HPT blade retaining plate. 

Therefore, the first-stage HPT hub, 

second-stage HPT hub, and second-stage 


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HPT blade retaining plate must be 

removed from service if the secondstage HPT air seal, P/N 50L041, is found 

with a through-crack. 

Relevant Service Information 

We reviewed PW Alert Service 

Bulletin (ASB) No. PW4G–112–A72– 

330, Revision 2, dated July 11, 2013, 

which describes procedures for 

inspecting the second-stage HPT air seal 

for cracks and PW Service Bulletin (SB) 

No. PW4G–112–72–332, Revision 2, 

dated April 9, 2014, which describes 

procedures for replacing the secondstage HPT air seal. 

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 expand the 

population of affected P/Ns, require 

removal from service of two newly 

identified P/Ns, require replacement of 

the mating hardware if the second-stage 

HPT air seal is found with a throughcrack, and add mandatory terminating 

action to the repetitive inspection 

requirements. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 116 engines installed on 

airplanes of U.S. registry. We also 

estimate that it would take about 5 

hours to perform the inspection 

required by this proposed AD. The 

average labor rate is $85 per hour. We 

estimate that two engines will also 

require replacement of the first-stage 

HPT hub, second-stage HPT hub, and 

second-stage HPT blade retaining plate. 

We estimate that parts would cost about 

$698,920 per engine. Based on these 

figures, we estimate the total cost of this 

proposed AD to U.S. operators to be 

$23,420,020. 

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 

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. 

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) 

2013–15–09, Amendment 39–17525 (78 

FR 49111, August 13, 2013), and adding 

the following new AD: 

Pratt & Whitney Division: Docket No. FAA– 

2013–0072; Directorate Identifier 2013– 

NE–04–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

AD action by August 4, 2014. 

(b) Affected ADs 

This AD supersedes AD 2013–15–09, 

Amendment 39–17525 (78 FR 49111, August 

13, 2013). 

(c) Applicability 

This AD applies to all Pratt & Whitney 

Division (PW) PW4074, PW4074D, PW4077, 

PW4077D, PW4084D, PW4090, and PW4090– 

3 turbofan engine models with second-stage 

high-pressure turbine (HPT) air seal, part 

number (P/N) 54L041, 50L960, or 50L976, 

installed. 

(d) Unsafe Condition 

This AD was prompted by additional 

reports of cracking in the second-stage HPT 

air seal. We are issuing this AD to prevent 

failure of the second-stage HPT air seal, 

which could lead to uncontained engine 

failure and damage to the airplane. 

(e) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(1) At the next piece-part exposure after the 

effective date of this AD, do the following: 

(i) Remove from service second-stage HPT 

air seals, P/N 50L960, 50L976, and 50L041. 

(ii) Fluorescent-penetrant inspect (FPI) 

second-stage HPT air seal, P/N 50L041, for a 

through-crack in the front forward fillet 

radius. 

(iii) If a through-crack in the front forward 

fillet radius is found, remove the first-stage 

HPT hub, second-stage HPT hub, and secondstage HPT blade retaining plate from service. 

Do not reinstall the first-stage HPT hub, 

second-stage HPT hub, or second-stage HPT 

blade retaining plate into any engine. 

(2) For engines with second-stage HPT air 

seals, P/N 50L041, installed, perform initial 

and repetitive inspections for cracks on-wing 

until the part is removed from the engine as 

follows: 

(i) Perform an initial eddy current 

inspection (ECI) for cracks prior to reaching 

2,200 cycles-since-new or within 100 cyclesin-service after the effective date of this AD, 

whichever occurs later. 

(ii) Thereafter, repeat the ECI every 1,200 

cycles since last inspection, or fewer, 

depending on the results of the inspection. 

(iii) Use section 4.0 of the appendix of PW 

Alert Service Bulletin (ASB) No. PW4G–112– 

A72–330, Revision 2, dated July 11, 2013, to 

perform the inspection and use paragraph 8 

of the Accomplishment Instructions of PW 

ASB No. PW4G–112–A72–330, Revision 2, 

dated July 11, 2013, to disposition the results 

of the inspection. 

(f) Installation Prohibition 

After the effective date of this AD, do not 

install any second-stage HPT air seal P/N 

50L041, P/N 50L960, or P/N 50L976 into any 

engine. 

(g) Definitions 

(1) For the purpose of this AD, piece-part 

exposure is when the second-stage HPT air 

seal is removed from the engine and fully 

disassembled. 

(2) For the purpose of this AD, a throughcrack is a crack that has propagated through 


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the thickness of the part and can be seen on 

both the inner diameter and outer diameter 

of the front forward fillet radius. 

(h) Credit for Previous Actions 

(1) If you performed an ECI of the secondstage HPT air seal before the effective date of 

this AD, using PW ASB No. PW4G–112– 

A72–330, Revision 1, dated February 14, 

2013, or earlier version, you have met the 

requirements of paragraph (e)(2)(i) of this AD. 

(2) If you performed an in-shop FPI of the 

second-stage HPT air seal before the effective 

date of this AD, you have met the 

requirements of paragraph (e)(2)(i) of this AD. 

(i) Alternative Methods of Compliance 

(AMOCs) 

The Manager, Engine Certification Office, 

FAA, may approve AMOCs for 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 James Gray, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: (781) 238–7742; fax: (781) 238–7199; 

email: james.e.gray@faa.gov. 

(2) For service information identified in 

this AD, contact Pratt & Whitney Division, 

400 Main St., East Hartford, CT 06108; 

phone: (860) 565–8770; fax: (860) 565–4503. 

(3) 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 

May 28, 2014. 

Colleen M. D’Alessandro, 

Assistant Directorate Manager, Engine & 

Propeller Directorate, Aircraft Certification 

Service. 

[FR Doc. 2014–13024 Filed 6–4–14; 8:45 am] 

BILLING CODE 4910–13–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 49 

[EPA–HQ–OAR–2011–0151; FRL–9910–71– 

OAR] 

RIN 2060–AS27 

Managing Emissions From Oil and 

Natural Gas Production in Indian 

Country 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Advance notice of proposed 

rulemaking. 

SUMMARY: The purpose of this Advance 

Notice of Proposed Rulemaking (ANPR) 

is to solicit broad feedback on the most 

effective and efficient means of 

implementing the Environmental 

Protection Agency’s (EPA) Indian 

Country Minor New Source Review 

program for sources in the oil and 

natural gas production segment of the 

oil and natural gas sector. In particular, 

this ANPR discusses potential new 

source permitting approaches to address 

emissions from proposed new and 

modified oil and natural gas production 

activities. One approach is a general 

permit, which could serve as a 

streamlined permitting approach for 

addressing emissions from new and 

modified minor sources and minor 

modifications at major sources under 

the Indian Country Minor NSR rule. 

Another approach is a Federal 

Implementation Plan, which could 

address emissions from new and 

modified minor sources and minor 

modifications at major sources. Other 

possible approaches include a permit by 

rule, which is another streamlined 

permitting approach. The EPA is 

requesting comments on all available 

new source permitting approaches and 

will take this feedback into 

consideration in developing a notice of 

proposed rulemaking for this sector 

under the Indian Country Minor NSR 

program. 

In addition, while the focus of this 

ANPR is on permitting approaches for 

proposed new oil and natural gas 

production activities, the EPA believes 

that managing emissions from existing 

oil and natural gas sources in Indian 

country would result in greater 

consistency with surrounding state 

requirements. Addressing existing 

sources may be particularly important 

given the significant activity associated 

with the sector in Indian country and 

the resultant need to protect public 

health, balanced with tribes’ inherent 

sovereignty and interest in promoting 

economic development. If the EPA 

decides to address existing oil and 

natural gas production sources, then we 

will be interested in considering 

comments regarding whether a FIP 

should be the mechanism used to 

establish permitting requirements for 

new and existing sources, especially in 

areas where surrounding states regulate 

existing sources. 

DATES: Comments must be received on 

or before July 21, 2014. 

ADDRESSES: Submit your comments, 

identified by Docket ID No. EPA–HQ– 

OAR–2011–0151, by one of the 

following methods: 

• www.regulations.gov: Follow the 

on-line instructions for submitting 

comments. 

• Email: a-and-r-docket@epa.gov. 

Include Docket ID No. EPA–HQ–OAR– 

2011–0151 in the subject line of the 

message. 

Fax: (202) 566–9744, attention Docket 

ID No. EPA–HQ–OAR–2011–0151. 

Mail: Attention Docket ID No. EPA– 

HQ–OAR–2011–0151, EPA, Mailcode: 

6102T, 1200 Pennsylvania Ave. NW., 

Washington, DC 20460. Please include a 

total of two copies. 

Hand Delivery: The EPA Docket 

Center, Public Reading Room, EPA 

West, Room 3334, 1301 Constitution 

Ave. NW., Washington, DC 20460, 

Attention Docket ID No. EPA–HQ– 

OAR–2011–0151. Such deliveries are 

only accepted during the Docket’s 

normal hours of operation, and special 

arrangements should be made for 

deliveries of boxed information. 

Instructions: Direct your comments to 

Docket ID No. EPA–HQ–OAR–2011– 

0151. The EPA’s policy is that all 

comments received will be included in 

the public docket without change and 

may be made available online at 

www.regulations.gov, including any 

personal information provided, unless 

the comment includes information 

claimed to be Confidential Business 

Information (CBI) or other information 

whose disclosure is restricted by statute. 

Do not submit information that you 

consider to be CBI or otherwise 

protected through www.regulations.gov 

or email. The www.regulations.gov Web 

site is an ‘‘anonymous access’’ system, 

which means the EPA will not know 

your identity or contact information 

unless you provide it in the body of 

your comment. If you send an email 

comment directly to the EPA without 

going through www.regulations.gov, 

your email address will be 

automatically captured and included as 

part of the comment that is placed in the 

public docket and made available on the 

internet. If you submit an electronic 

comment, the EPA recommends that 

you include your name and other 

contact information in the body of your 

comment and with any disk or CD–ROM 

you submit. If the EPA cannot read your 

comment due to technical difficulties 

and cannot contact you for clarification, 

the EPA may not be able to consider 

your comment. Electronic files should 

avoid the use of special characters, any 

form of encryption, and be free of any 

defects or viruses. For additional 

instructions on submitting comments, 

go to Section I.C of the SUPPLEMENTARY

INFORMATION section of this document. 

Docket: The EPA has established a 

docket for this action under Docket ID 

Number EPA–HQ–OAR–2011–0151. All 

documents in the docket are listed in 

the www.regulations.gov index. 

Although listed in the index, some 

information is not publicly available, 


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