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

67253 

Vol. 75, No. 211 

Tuesday, November 2, 2010 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–1095; Directorate 

Identifier 2009–NE–40–AD] 

RIN 2120–AA64 

Airworthiness Directives; Pratt & 

Whitney (PW) Models PW4074 and 

PW4077 Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

PW PW4074 and PW4077 turbofan 

engines with 15th stage high-pressure 

compressor (HPC) disks, part number 

(P/N) 55H615, installed. This proposed 

AD would require removing the 15th 

stage HPC disk within 12,000 cycles 

since new (CSN) or, for any disks that 

exceed 12,000 CSN after the effective 

date of this AD using a drawdown plan 

that includes a borescope inspection 

(BSI) or eddy current inspection (ECI) of 

the rim for cracks. This proposed AD 

results from multiple shop findings of 

cracked 15th stage HPC disks. We are 

proposing this AD to prevent cracks 

from propagating into the bolt hole, 

which could result in a failure of the 

15th stage HPC disk, uncontained 

engine failure, and damage to the 

airplane. 

DATES: We must receive any comments 

on this proposed AD by January 3, 2011. 

ADDRESSES: Use one of the following 

addresses to comment on this proposed 

AD. 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov and follow 

the instructions for sending your 

comments electronically. 

• Mail: Docket Management Facility, 

U.S. Department of Transportation, 1200 

New Jersey Avenue, SE., West Building 

Ground Floor, Room W12–140, 

Washington, DC 20590–0001. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. 

• Fax: (202) 493–2251. 

Contact Pratt & Whitney, 400 Main 

St., East Hartford, CT 06108; telephone 

(860) 565–7700; fax (860) 565–1605, for 

a copy of the service information 

identified in this proposed AD. 

FOR FURTHER INFORMATION CONTACT: 

James Gray, Aerospace Engineer, Engine 

Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

e-mail: james.e.gray@faa.gov; telephone 

(781) 238–7742; fax (781) 238–7199. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send us any written 

relevant data, views, or arguments 

regarding this proposal. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA– 

2010–1095; Directorate Identifier 2009– 

NE–40–AD’’ in the subject line of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of the proposed AD. We will 

consider all comments received by the 

closing date and may amend the 

proposed AD in light 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 with FAA 

personnel concerning this proposed AD. 

Using the search function of the Web 

site, anyone can find and read the 

comments in any of our dockets, 

including, if provided, the name of the 

individual who sent the comment (or 

signed the comment on behalf of an 

association, business, labor union, etc.). 

You may review the DOT’s complete 

Privacy Act Statement in the Federal 

Register published on April 11, 2000 

(65 FR 19477–78). 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Operations office 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 Operations 

office (telephone (800) 647–5527) is the 

same as the Mail address provided in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

Discussion 

We have received reports of multiple 

shop findings of cracked 15th stage HPC 

disks that required removing the disks 

from service. As of June 30, 2010, 53 

disks with cracks in the front rail of the 

load and lock slots have been reported. 

Engineering investigation determined 

that the initiation was the result of 

thermal mechanical fatigue. Three of the 

disks had cracks that propagated 

radially into the bolt holes. These cracks 

could propagate further and lead to 

failure of the disk. 

This condition, if not corrected, could 

result in a failure of the 15th stage HPC 

disk, uncontained engine failure, and 

damage to the airplane. 

Relevant Service Information 

We have reviewed and approved the 

technical contents of PW Service 

Bulletin (SB) PW4G–112–72–309, 

Revision 1, dated July 1, 2010, that 

describes procedures for performing a 

BSI or ECI for cracks in the front rail of 

the outer rim of the 15th stage HPC disk. 

FAA’s Determination and Requirements 

of the Proposed AD 

We have evaluated all pertinent 

information and identified an unsafe 

condition that is likely to exist or 

develop on other products of this same 

type design. We are proposing this AD, 

which would require removing the 15th 

stage HPC disk before 12,000 CSN, or for 

any disks that exceed 12,000 CSN after 

the effective date of this AD using a 

drawdown plan that includes a BSI or 

ECI of the rim for cracks. The proposed 

AD would require you to use the service 

information described previously to 

perform these actions. 

Interim Action 

These actions are interim actions and 

we may take further rulemaking actions 

in the future. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 44 engines installed on 

airplanes of U.S. registry. Prorated parts 


jlentini on DSKJ8SOYB1PROD with PROPOSALS
67254 Federal Register / Vol. 75, No. 211 / Tuesday, November 2, 2010 / Proposed Rules 

would cost about $66,000 per 15th stage 

HPC disk. Based on these figures, we 

estimate the total cost of the proposed 

AD to U.S. operators to be $2,904,000. 

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 AD: 

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); 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD. You may get a copy 

of this summary at the address listed 

under ADDRESSES. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Under the authority delegated to me 

by the Administrator, the Federal 

Aviation Administration 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: 

Pratt & Whitney: Docket No. FAA–2010– 

1095; Directorate Identifier 2009–NE– 

40–AD. 

Comments Due Date 

(a) The Federal Aviation Administration 

(FAA) must receive comments on this 

airworthiness directive (AD) action by 

January 3, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Pratt & Whitney 

(PW) PW4074 and PW4077 turbofan engines 

with 15th stage high-pressure compressor 

(HPC) disks, part number (P/N) 55H615, 

installed. These engines are installed on, but 

not limited to, Boeing 777–200 series and 

777–300 series airplanes. 

Unsafe Condition 

(d) This AD results from multiple shop 

findings of cracked 15th stage HPC disks. We 

are issuing this AD to prevent cracks from 

propagating into the bolt holes of the 15th 

stage HPC disk, which could result in a 

failure of the 15th stage HPC disk, 

uncontained engine failure, and damage to 

the airplane. 

Compliance 

(e) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified unless the 

actions have already been done. 

(f) For 15th stage HPC disks that have 9,865 

or fewer cycles since new (CSN) on the 

effective date of this AD, remove the disk 

from service before accumulating 12,000 

CSN. 

(g) For 15th stage HPC disks that have 

accumulated more than 9,865 CSN on the 

effective date of this AD, do the following: 

(1) Remove the disk from service at the 

next piece-part exposure above 12,000 CSN, 

not to exceed 2,135 cycles-in-service (CIS) 

after the effective date of this AD. 

(2) For 15th stage HPC disks that are 

installed in the engine and exceed 12,000 

CSN, perform a borescope inspection (BSI) or 

eddy current inspection (ECI): 

(i) Within 2,400 cycles-since-last 

fluorescent penetrant inspection or ECI, or 

(ii) Within 1,200 cycles-since-last BSI, or 

(iii) Within 55 cycles-in-service (CIS) after 

the effective date of this AD, whichever is 

latest. 

(3) If you see a suspected crack using a BSI 

from paragraph (g)(2) of this AD, but can’t 

visually confirm a crack, perform an ECI 

within 5 CIS after the BSI. 

(4) If you find a crack using any inspection, 

remove the disk from service before further 

flight. 

(h) Use paragraph 1.A. or 1.B. of the 

Accomplishment Instructions ‘‘For Engines 

Installed on the Aircraft’’ or 1.A. or 1.B. of the 

Accomplishment Instructions ‘‘For Engines 

Removed from the Aircraft,’’ of PW Service 

Bulletin PW4G–112–72–309, Revision 1, 

dated July 1, 2010 to perform the inspections. 

Alternative Methods of Compliance 

(i) The Manager, Engine Certification 

Office, has the authority to approve 

alternative methods of compliance for this 

AD if requested using the procedures found 

in 14 CFR 39.19. 

Related Information 

(j) Contact James Gray, Aerospace 

Engineer, Engine Certification Office, FAA, 

Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 

01803; e-mail: james.e.gray@faa.gov; 

telephone (781) 238–7742; fax (781) 238– 

7199, for more information about this AD. 

(k) Pratt & Whitney Service Bulletin 

PW4G–112–72–309 Revision 1, dated July 1, 

2010, pertains to the subject of this AD. 

Contact Pratt & Whitney, 400 Main St., East 

Hartford, CT 06108; telephone (860) 565– 

7700; fax (860) 565–1605, for a copy of this 

service information. 

Issued in Burlington, Massachusetts, on 

October 26, 2010. 

Karen M. Grant, 

Acting Assistant Manager, Engine and 

Propeller Directorate, Aircraft Certification 

Service. 

[FR Doc. 2010–27607 Filed 11–1–10; 8:45 am] 

BILLING CODE 4910–13–P 

COMMODITY FUTURES TRADING 

COMMISSION 

17 CFR Parts 1 and 4 

RIN 3038–AD11 

Removing Any Reference to or 

Reliance on Credit Ratings in 

Commission Regulations; Proposing 

Alternatives to the Use of Credit 

Ratings 

AGENCY: Commodity Futures Trading 

Commission. 

ACTION: Notice of proposed rulemaking. 

SUMMARY: The Commodity Futures 

Trading Commission (‘‘Commission’’ or 

‘‘CFTC’’) is proposing rules to 

implement new statutory provisions 

enacted by Title IX of the Dodd-Frank 

Wall Street Reform and Consumer 

Protection Act. These proposed rules 

apply to futures commission merchants, 

designated clearing organizations and 

commodity pool operators. The 

proposed rules implement the new 

statutory framework that requires 

agencies to replace any reference to or 


jlentini on DSKJ8SOYB1PROD with PROPOSALS