Federal Register / Vol. 72, No. 97 / Monday, May 21, 2007 / Proposed Rules 28459 

implications under Executive Order 

13132. Additionally, 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); and 

3. 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 draft economic 

evaluation of the estimated costs to 

comply with this proposed AD. See the 

DMS to examine the draft economic 

evaluation. 

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. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Safety. 

The Proposed Amendment 

Accordingly, pursuant to the 

authority delegated to me by the 

Administrator, the Federal Aviation 

Administration proposes to amend part 

39 of the Federal Aviation Regulations 

(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. Section 39.13 is amended by 

adding a new airworthiness directive to 

read as follows: 

Eurocopter France: Docket No. FAA–2007–

28228; Directorate Identifier 2006–SW–

08–AD. 

Applicability: Model EC130 B4 helicopters 

not modified per MOD 073572, with the 

battery in either the right-hand baggage 

compartment or the tailboom, certificated in 

any category. 

Compliance: Required within 110 hours 

time-in-service, unless accomplished 

previously. 

To correct the connection of the thermal 

switch to the cockpit indicator light, to notify 

the flight crew of an overheated battery, and 

to prevent a thermal runaway of the battery, 

an in-flight fire, and subsequent loss of 

control of the helicopter, do the following: 

(a) Modify the wiring of the battery 

overheat sensing circuit and test the battery 

overheat sensing indicator light by following 

the Accomplishment Instructions, paragraph 

2.B.1. or 2.B.2., depending on the location of 

the battery, of Eurocopter Alert Telex No. 

24A001, dated December 20, 2005. 

(b) Modifying and testing the battery 

overheat sensing circuit by following 

paragraph (a) of this AD is terminating action 

for the requirements of this AD. 

(c) To request a different method of 

compliance or a different compliance time 

for this AD, follow the procedures in 14 CFR 

39.19. Contact the Manager, Rotorcraft 

Directorate, FAA, ATTN: Gary Middleton, 

Aviation Safety Engineer, Regulations and 

Policy Group, Fort Worth, Texas 76193–0111, 

telephone (817) 222–5197, fax (817) 222–

5961, for information about previously 

approved alternative methods of compliance. 

Note: The subject of this AD is addressed 

in Direction Generale De L’Aviation Civile 

(France) AD No. F–2006–010, dated January 

4, 2006. 

Issued in Fort Worth, Texas, on May 1, 

2007. 

Scott A. Horn, 

Acting Manager, Rotorcraft Directorate, 

Aircraft Certification Service. 

[FR Doc. E7–9695 Filed 5–18–07; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2007–27230; Directorate 

Identifier 2007–NE–04–AD] 

RIN 2120–AA64 

Airworthiness Directives; Pratt & 

Whitney (PW) PW4164, PW4168, and 

PW4168A Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

PW PW4164, PW4168, and PW4168A 

turbofan engines with certain low 

pressure turbine (LPT) stage 4 disks, 

part number (P/N) 51N404, installed. 

This proposed AD would require 

removing certain LPT stage 4 disks, 

listed by serial number at the next 

piece-part exposure or within 7,500 

cycles-since-new (CSN), whichever 

occurs first. This proposed AD results 

from a report of improperly 

manufactured LPT stage 4 disks. We are 

proposing this AD to prevent an 

uncontained engine failure due to lowcycle fatigue (LCF), which could result 

in damage to the airplane. 

DATES: We must receive any comments 

on this proposed AD by July 20, 2007. 

ADDRESSES: Use one of the following 

addresses to comment on this proposed 

AD. 

• DOT Docket Web site: Go to 

http://dms.dot.gov and follow the 

instructions for sending your comments 

electronically. 

• Government-wide rulemaking Web 

site: Go to http://www.regulations.gov 

and follow the instructions for sending 

your comments electronically. 

• Mail: Docket Management Facility; 

U.S. Department of Transportation, 400 

Seventh Street, SW., Nassif Building, 

Room PL–401, Washington, DC 20590–

0001. 

• Fax: (202) 493–2251. 

• Hand Delivery: Room PL–401 on 

the plaza level of the Nassif Building, 

400 Seventh Street, SW., Washington, 

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

through Friday, except Federal holidays. 

You may examine the comments on 

this proposed AD in the AD docket on 

the Internet at http://dms.dot.gov. 

FOR FURTHER INFORMATION CONTACT: V. 

Rose Len, Aerospace Engineer, Engine 

Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

telephone (781) 238–7772; 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–

2007–27230; Directorate Identifier 

2007–NE–04–AD’’ in the subject line of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 


cprice-sewell on PROD1PC71 with PROPOSALS
28460 Federal Register / Vol. 72, No. 97 / Monday, May 21, 2007 / Proposed Rules 

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:// 

dms.dot.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 DOT 

Web site, anyone can find and read the 

comments in any of our dockets, 

including 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) or you may visit http:// 

dms.dot.gov. 

Examining the AD Docket 

You may examine the docket that 

contains the proposal, any comments 

received and, any final disposition in 

person at the Docket Management 

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

Monday through Friday, except Federal 

holidays. The Docket Office (telephone 

(800) 647–5227) is located on the plaza 

level of the Department of 

Transportation Nassif Building at the 

street address stated in ADDRESSES. 

Comments will be available in the AD 

docket shortly after the Docket 

Management Facility receives them. 

Discussion 

On September 29, 2006, we received 

a report of 16 LPT stage 4 disks, P/N 

51N404, manufactured with an 

improper material process. The disks 

were not properly heat treated during 

the manufacturing process. The 

manufacturer solution-heat treated the 

disks for one hour instead of the four 

hours required. We believe this 

manufacturing discrepancy will result 

in reduced LCF properties for the disks. 

Operating the affected disks to the 

certified life limit could result in 

uncontained failure of the disk due to 

LCF. Although we have received no 

reports of disk separations, this 

condition, if not corrected, could result 

in the disk separating from the engine 

due to LCF, which could result in 

damage to the airplane. 

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 certain 

LPT stage 4 disks, P/N 51N404, listed by 

serial number in the proposed AD, at 

the next piece-part exposure, or within 

7,500 CSN, whichever occurs first. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 11 engines installed on 

airplanes of U.S. registry. We also 

estimate that it would take about 250 

work-hours per engine to perform the 

proposed action, if not done at piecepart exposure, and that the average labor 

rate is $80 per work-hour. Required 

parts would cost about $186,288 per 

engine. Based on these figures, we 

estimate the total cost of the proposed 

AD to U.S. operators to be $2,269,168. 

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, 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–2007–

27230; Directorate Identifier 2007–NE–

04–AD. 

Comments Due Date 

(a) The Federal Aviation Administration 

(FAA) must receive comments on this 

airworthiness directive (AD) action by July 

20, 2007. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Pratt & Whitney 

PW4164, PW4168, and PW4168A turbofan 

engines with certain low pressure turbine 

(LPT) stage 4 disks, part number (P/N) 

51N404, that have a serial number listed in 

the following Table 1 of this AD installed. 

These engines are installed on, but not 

limited to, Airbus A330–200 and A330–300 

series airplanes. 

TABLE 1.—AFFECTED LPT STAGE 4 

DISKS BY SERIAL NUMBER

LPT stage 4 disk serial numbers 

CLDLC01142 

CLDLC01143 

CLDLC01144 

CLDLC01145 

CLDLC01146 

CLDLC01148 

CLDLC01149 

CLDLC01150 

CLDLC01151 

CLDLC01152 

CLDLC01181 

CLDLC01182 

CLDLC01183 

CLDLC01185 

CLDLC01186 

CLDLC01187 


cprice-sewell on PROD1PC71 with PROPOSALS
Federal Register / Vol. 72, No. 97 / Monday, May 21, 2007 / Proposed Rules 28461 

Unsafe Condition 

(d) This AD results from a report of 

improperly manufactured LPT stage 4 disks. 

We are issuing this AD to prevent an 

uncontained engine failure due to low-cycle 

fatigue, which could result in damage to the 

airplane. 

Compliance 

(e) You are responsible for having the 

actions required by this AD performed at the 

next piece-part exposure after the effective 

date of this AD or within 7,500 cycles-sincenew, unless the actions have already been 

done. 

Removing the LPT Stage 4 Disk 

(f) Remove from service any LPT stage 4 

disk that has a serial number listed in Table 

1 of this AD. 

Prohibition Against Installing an Affected 

Disk 

(g) After the effective date of this AD, do 

not install any disk, P/N 51N404, that has a 

serial number listed in Table 1 of this AD or 

any disk removed as specified in paragraph 

(f) of this AD except as allowed by paragraph 

(h) of this AD. 

Alternative Methods of Compliance 

(h) 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. 

Special Flight Permits 

(i) Under 14 CFR part 39.23, we are 

prohibiting the special flight permits for this 

AD. 

Related Information 

(j) None. 

Issued in Burlington, Massachusetts, on 

May 11, 2007. 

Peter A. White, 

Acting Manager, Engine and Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. E7–9697 Filed 5–18–07; 8:45 am] 

BILLING CODE 4910–13–P 


cprice-sewell on PROD1PC71 with PROPOSALS