Federal Register / Vol. 75, No. 106 / Thursday, June 3, 2010 / Proposed Rules 31327 

Issued in Renton, Washington, on May 25, 

2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–13305 Filed 6–2–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0547; Directorate 

Identifier 2009–NM–234–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for all 

Model 757 airplanes. This proposed AD 

would require a detailed inspection of 

the inboard and outboard main track 

downstop assemblies and a torque 

application to the main track downstop 

assembly nuts of slat numbers 1 through 

10, excluding the outboard track of slats 

1 and 10, a detailed inspection of all slat 

track housings, and related corrective 

actions if necessary. This proposed AD 

results from reports of fuel leaking from 

the front spar of the wing through the 

slat track housing. We are proposing 

this AD to detect and correct incorrectly 

installed main track downstop 

assemblies, which, when the slat is 

retracted, could cause a puncture in the 

slat track housing leading to a fuel leak 

and potential fire. 

DATES: We must receive comments on 

this proposed AD by July 19, 2010. 

ADDRESSES: You may send comments 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 proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; e-mail 

me.boecom@boeing.com; Internet 

https://www.myboeingfleet.com. You 

may review copies of the referenced 

service information at the FAA, 

Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington. 

For information on the availability of 

this material at the FAA, call 425–227– 

1221. 

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 

(telephone 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Chris Hartman, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office 

(ACO), 1601 Lind Avenue SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6432; fax (425) 917–6590. 

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–2010–0547; Directorate Identifier 

2009–NM–234–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 

We have received two reports of fuel 

leaking from the front spar of the wing 

through the slat track housing. In at 

least one case, the source of the fuel leak 

was from a puncture of the slat track 

housing caused by a roller that had 

fallen into the slat track housing. The 

roller, which was not a component of 

the slat installation or the slat track 

support rib, subsequently punctured the 

slat track housing when the slat was 

retracted. While fuel leaking from a 

punctured slat track housing could lead 

to a fire, in both cases, no fires were 

reported. 

Relevant Service Information 

We have reviewed Boeing Special 

Attention Bulletin 757–57–0068, dated 

September 15, 2009. That service 

bulletin describes procedures for doing 

a detailed inspection of the inboard and 

outboard main track downstop 

assemblies and for applying torque to 

the main track downstop assembly nuts 

of slat numbers 1 through 10, excluding 

the outboard track of slats 1 and 10. 

That service bulletin also describes 

procedures for doing a detailed 

inspection of both inboard and outboard 

slat track housings of slat numbers 1 

through 10 for foreign object debris or 

visible damage, and doing corrective 

actions if necessary. Boeing Special 

Attention Bulletin 757–57–0068, dated 

September 15, 2009, specifies the 

following corrective actions: 

• Removing and reinstalling 

incorrectly installed main track 

downstop assemblies. 

• Replacing damaged or missing main 

track downstop assembly parts. 

• Removing foreign object debris. 

• Repairing or replacing damaged slat 

track housings. 

• Contacting Boeing for repair 

instructions. 

Boeing Special Attention Bulletin 

757–57–0068, dated September 15, 

2009, specifies that the detailed 

inspections of the main track downstop 

assembles and the slat track housings be 

done before 24 months after the date on 

that service bulletin. That service 

bulletin also specifies that application 

of torque to the main track downstop 

assembly nuts be done before 24 months 

after the date on that service bulletin. 

That service bulletin also specifies that 

corrective actions be done before further 

flight. 

FAA’s Determination and Requirements 

of This Proposed AD 

We are proposing this AD because we 

evaluated all relevant information and 

determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. This proposed AD would 

require accomplishing the actions 

specified in the service information 

described previously, except as 

discussed under ‘‘Differences Between 


srobinson on DSKHWCL6B1PROD with PROPOSALS
31328 Federal Register / Vol. 75, No. 106 / Thursday, June 3, 2010 / Proposed Rules 

the Proposed AD and the Service 

Bulletin.’’ The proposed AD would also 

require sending the inspection results to 

Boeing. 

Differences Between the Proposed AD 

and the Service Bulletin 

Boeing Special Attention Bulletin 

757–57–0068, dated September 15, 

2009, specifies to contact the 

manufacturer for instructions on how to 

repair certain conditions, but this 

proposed AD would require repairing 

those conditions in one of the following 

ways: 

• Using a method that we approve; or 

• Using data that meet the 

certification basis of the airplane, and 

that have been approved by the Boeing 

Commercial Airplanes Organization 

Designation Authorization (ODA) that 

we have authorized to make those 

findings. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 645 airplanes of U.S. 

registry. We also estimate that it would 

take about 19 work-hours per product to 

comply with this proposed AD. The 

average labor rate is $85 per work-hour. 

Based on these figures, we estimate the 

cost of this proposed AD to the U.S. 

operators to be $1,041,675, or $1,615 per 

product. 

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 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), 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. 

You can find our regulatory 

evaluation and the estimated costs of 

compliance 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 adding 

the following new AD: 

The Boeing Company: Docket No. FAA– 

2010–0547; Directorate Identifier 2009– 

NM–234–AD. 

Comments Due Date 

(a) We must receive comments by July 19, 

2010. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to all The Boeing 

Company Model 757–200, –200PF, –200CB, 

and –300 series airplanes, certificated in any 

category. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 57: Wings. 

Unsafe Condition 

(e) This AD results from reports of fuel 

leaking from the front spar of the wing 

through the slat track housing. The Federal 

Aviation Administration is issuing this AD to 

detect and correct incorrectly installed main 

track downstop assemblies, which, when the 

slat is retracted, could cause a puncture in 

the slat track housing leading to a fuel leak 

and potential fire. 

Compliance 

(f) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Inspection and Torque Application 

(g) Except as required by paragraph (h) of 

this AD, at the applicable time specified in 

paragraph 1.E., ‘‘Compliance,’’ of Boeing 

Special Attention Service Bulletin 757–57– 

0068, dated September 15, 2009: Perform a 

detailed inspection of the inboard and 

outboard main track downstop assemblies of 

slat numbers 1 through 10, excluding the 

outboard main track downstop assemblies of 

slat numbers 1 and 10 and perform a detailed 

inspection of all slat track housings for 

foreign object debris, visible damage, and 

missing parts, in accordance with the 

Accomplishment Instructions of Boeing 

Special Attention Service Bulletin 757–57– 

0068, dated September 15, 2009. At the 

applicable time specified in paragraph 1.E., 

‘‘Compliance,’’ of Boeing Special Attention 

Service Bulletin 757–57–0068, dated 

September 15, 2009, apply torque to the main 

track down stop assembly nuts to make sure 

they have been correctly installed, in 

accordance with the Accomplishment 

Instructions of Boeing Special Attention 

Service Bulletin 757–57–0068, dated 

September 15, 2009. Do all applicable 

corrective actions before further flight, in 

accordance with Boeing Special Attention 

Service Bulletin 757–57–0068, dated 

September 15, 2009. 

Exceptions to the Service Bulletin 

(h) Where Boeing Special Attention Service 

Bulletin 757–57–0068, dated September 15, 

2009, specifies a compliance time ‘‘after the 

date on this service bulletin,’’ this AD 

requires compliance at the specified time 

after the effective date of this AD. 

(i) Where Boeing Special Attention Service 

Bulletin 757–57–0068, dated September 15, 

2009, specifies to contact Boeing for 

appropriate action: Before further flight, 

repair the damage using a method approved 

in accordance with the procedures specified 

in paragraph (j) of this AD. 

Alternative Methods of Compliance 

(AMOCs) 

(j)(1) The Manager, Seattle Aircraft 

Certification Office, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

Send information to ATTN: Chris Hartman, 

Aerospace Engineer, Airframe Branch, ANM– 

120S, FAA, Seattle Aircraft Certification 

Office (ACO), 1601 Lind Avenue SW., 

Renton, Washington 98057–3356; telephone 

(425) 917–6432; fax (425) 917–6590. 

Information may be e-mailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) To request a different method of 

compliance or a different compliance time 

for this AD, follow the procedures in 14 CFR 

39.19. Before using any approved AMOC on 

any airplane to which the AMOC applies, 

notify your principal maintenance inspector 

(PMI) or principal avionics inspector (PAI), 

as appropriate, or lacking a principal 

inspector, your local Flight Standards District 


srobinson on DSKHWCL6B1PROD with PROPOSALS
Federal Register / Vol. 75, No. 106 / Thursday, June 3, 2010 / Proposed Rules 31329 

Office. The AMOC approval letter must 

specifically reference this AD. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair 

required by this AD if it is approved by the 

Boeing Commercial Airplanes Organization 

Designation Authorization (ODA) that has 

been authorized by the Manager, Seattle ACO 

to make those findings. For a repair method 

to be approved, the repair must meet the 

certification basis of the airplane, and the 

approval must specifically refer to this AD. 

Issued in Renton, Washington, on May 24, 

2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–13306 Filed 6–2–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0483; Directorate 

Identifier 2010–NM–065–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for all 

Model 757 airplanes. This proposed AD 

would require changing the lower fixed 

leading edge panel assemblies 

immediately outboard of the nacelles at 

slats 4 and 7. This proposed AD results 

from reports of Model 757 airplanes in 

service that have drain holes and 

unsealed panel assemblies in the fixed 

leading edge adjacent to the inboard end 

of slats 4 and 7 that are too close to the 

hot portion of the engines. We are 

proposing this AD to prevent fuel 

leaking onto an engine and a consequent 

fire. 

DATES: We must receive comments on 

this proposed AD by July 19, 2010. 

ADDRESSES: You may send comments 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 proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P. O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; e-mail 

me.boecom@boeing.com; Internet 

https://www.myboeingfleet.com. You 

may review copies of the referenced 

service information at the FAA, 

Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington. 

For information on the availability of 

this material at the FAA, call 425–227– 

1221. 

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 

(telephone 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: Tak 

Kobayashi, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6499; fax (425) 917–6590. 

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–2010–0483; Directorate Identifier 

2010–NM–065–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 

The manufacturer has reported that 

Model 757 airplanes in service have 

drain holes and unsealed panel 

assemblies in the fixed leading edge 

adjacent to the inboard end of slats 4 

and 7 that are too close to the hot 

portion of the engines. This condition, 

if not corrected, could result in fuel 

leaking onto an engine and a consequent 

fire. 

Relevant Service Information 

We have reviewed Boeing Special 

Attention Service Bulletin 757–57– 

0070, dated January 27, 2010. The 

service bulletin describes procedures for 

changing the lower fixed leading edge 

panel assemblies immediately outboard 

of the nacelles at slats 4 and 7. A design 

change adds new drain holes and seals 

ribs adjacent to the new drain holes 

which will create new drain paths to 

direct fluid drainage from the adjacent 

slat track housings safely away from the 

hot portion of the engines. 

FAA’s Determination and Requirements 

of This Proposed AD 

We are proposing this AD because we 

evaluated all relevant information and 

determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. This proposed AD would 

require accomplishing the actions 

specified in the service information 

described previously. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 697 airplanes of U.S. 

registry. We also estimate that it would 

take about 9 work-hours per product to 

comply with this proposed AD. The 

average labor rate is $85 per work-hour. 

Based on these figures, we estimate the 

cost of this proposed AD to the U.S. 

operators to be $533,205, or $765 per 

product. 

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 


srobinson on DSKHWCL6B1PROD with PROPOSALS