77790 Federal Register / Vol. 75, No. 239 / Tuesday, December 14, 2010 / Proposed Rules 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–1160; Directorate 

Identifier 2010–NM–148–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 767 Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede an existing airworthiness 

directive (AD) that applies to all Model 

767 airplanes. The existing AD currently 

requires repetitive inspections to detect 

discrepancies of the wiring and 

surrounding Teflon sleeves of the fuel 

tank boost pumps and override/jettison 

pumps; replacement of the sleeves with 

new sleeves, for certain airplanes; and 

repair or replacement of the wiring and 

sleeves with new parts, as necessary. 

This proposed AD would reduce the 

initial compliance time and repetitive 

inspection interval in the existing AD. 

This proposed AD results from fleet 

information indicating that the 

repetitive inspection interval in the 

existing AD is too long because 

excessive chafing of the sleeving 

continues to occur much earlier than 

expected between scheduled 

inspections. We are proposing this AD 

to detect and correct chafing of the fuel 

pump wire insulation and consequent 

exposure of the electrical conductor, 

which could result in electrical arcing 

between the wires and conduit and 

consequent fire or explosion of the fuel 

tank. 

DATES: We must receive comments on 

this proposed AD by January 28, 2011. 

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: 

Douglas Bryant, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6505; 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–2010–1160; Directorate Identifier 

2010–NM–148–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 23, 2000, we issued AD 

2000–11–06, amendment 39–11754 (65 

FR 34928, June 1, 2000), for all Model 

767 airplanes. (A correction of the rule 

was published in the Federal Register 

on August 1, 2000 (65 FR 46862).) That 

AD requires repetitive inspections to 

detect discrepancies of the wiring and 

surrounding Teflon sleeves of the fuel 

tank boost pumps and override/jettison 

pumps; replacement of the sleeves with 

new sleeves, for certain airplanes; and 

repair or replacement of the wiring and 

sleeves with new parts, as necessary. 

That AD resulted from reports of chafing 

of Teflon sleeves that surround and 

protect electrical wires inside conduits 

installed in the fuel tanks. We issued 

that AD to ensure adequate protection to 

the fuel pump wire insulation. Such 

chafing of the wire insulation could 

eventually result in exposure of the 

electrical conductor, permit arcing from 

the wire to the conduit, and create a 

potential for a fuel tank fire or 

explosion. 

Actions Since Existing AD Was Issued 

Since we issued AD 2000–11–06, we 

received fleet information from the 

manufacturer indicating that excessive 

chafing of the sleeving continues to 

occur much earlier than expected 

between scheduled inspections. Due to 

that fact, the manufacturer has revised 

the service information to reduce the 

initial and repetitive inspection 

intervals. 

Relevant Service Information 

We have reviewed Boeing Alert 

Service Bulletin 767–28A0053, Revision 

2, dated June 24, 2010. Boeing Service 

Bulletin 767–28A0053, Revision 1, 

dated August 5, 1999, was referred to as 

the appropriate source of service 

information for accomplishing the 

actions in the existing AD. Revision 2 of 

this service bulletin reduces the initial 

compliance time and repetitive 

inspection interval for the repetitive 

inspections required by the existing AD. 

FAA’s Determination and Requirements 

of the Proposed AD 

We have evaluated all pertinent 

information and identified an unsafe 

condition that is likely to develop on 

other products of the same type design. 

For this reason, we are proposing this 

AD, which would supersede AD 2000– 

11–06 and would retain the 

requirements of the existing AD at 

reduced compliance times. 

Change to Existing AD 

This proposed AD would retain all 

requirements of AD 2000–11–06. Since 

that AD was issued, the AD format has 

been revised, and certain paragraphs 

have been rearranged. As a result, the 

corresponding paragraph identifiers 

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Federal Register / Vol. 75, No. 239 / Tuesday, December 14, 2010 / Proposed Rules 77791 

have changed in this proposed AD, as 

listed in the following table: 

REVISED PARAGRAPH IDENTIFIERS

Requirement in AD 

2000–11–06 

Corresponding 

requirement in 

this proposed 

AD 

paragraph (a) ..................... paragraph (g). 

paragraph (b) ..................... paragraph (h). 

paragraph (c) ..................... paragraph (i). 

paragraph (d) ..................... paragraph (j). 

paragraph (e) ..................... paragraph (k). 

Costs of Compliance 

There are about 932 airplanes of the 

affected design in the worldwide fleet. 

This proposed AD would affect about 

410 airplanes of U.S. registry. The new 

requirements of this proposed AD add 

no additional economic burden. The 

current costs for this proposed AD are 

repeated below for the convenience of 

affected operators. 

The actions that are required by AD 

2000–11–06 and retained in this 

proposed AD take about 5 work-hours 

per airplane (for airplanes with jettison 

pumps) or 3 work-hours per airplane 

(for airplanes without jettison pumps), 

at an average labor rate of $85 per workhour. Required parts cost about $336 per 

airplane. Based on these figures, the 

estimated cost of the currently required 

actions is either $761 or $591 per 

airplane, per inspection cycle. 

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 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 regulatory evaluation 

of the estimated costs to comply with 

this proposed AD and placed it in the 

AD docket. See the ADDRESSES section 

for a location to examine the regulatory 

evaluation. 

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 Amendment 39–11754 (65 FR 

34928, June 1, 2000) and adding the 

following new AD: 

The Boeing Company: Docket No. FAA– 

2010–1160; Directorate Identifier 2010– 

NM–148–AD. 

Comments Due Date 

(a) The FAA must receive comments on 

this AD action by January 28, 2011. 

Affected ADs 

(b) This AD supersedes AD 2000–11–06, 

Amendment 39–11754. 

Applicability 

(c) This AD applies to all The Boeing 

Company Model 767–200, –300, –300F, and 

–400ER series airplanes, certificated in any 

category. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 28: Fuel. 

Unsafe Condition 

(e) This AD results from fleet information 

indicating that the repetitive inspection 

interval in the existing AD is too long 

because excessive chafing of the sleeving 

continues to occur much earlier than 

expected between scheduled inspections. 

The Federal Aviation Administration is 

issuing this AD to detect and correct chafing 

of the fuel pump wire insulation and 

consequent exposure of the electrical 

conductor, which could result in electrical 

arcing between the wires and conduit and 

consequent fire or explosion of the fuel tank. 

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. 

Restatement of Requirements of AD 2000– 

11–06, Amendment 39–11754 

Inspections 

(g) Perform a detailed visual inspection to 

detect discrepancies—including the presence 

of splices, cuts, splits, holes, worn areas, and 

lacing ties installed on the outside of the 

sleeves (except at the sleeve ends)—of the 

Teflon sleeves surrounding the wiring of the 

fuel tank boost pumps and override/jettison 

pumps, at the earlier of the times specified 

in paragraphs (g)(1) and (g)(2) of this AD, in 

accordance with Boeing Service Bulletin 

767–28A0053, Revision 1, dated August 5, 

1999; or Boeing Alert Service Bulletin 767– 

28A0053, Revision 2, dated June 24, 2010; as 

applicable. Repeat the inspection thereafter 

at intervals not to exceed 60,000 flight hours 

or 30,000 flight cycles, whichever occurs 

first. After the effective date of this AD, only 

Revision 2 of Boeing Alert Service Bulletin 

767–28A0053 may be used. 

(1) Prior to the accumulation of 50,000 

total flight hours, or within 90 days after July 

6, 2000 (the effective date of AD 2000–11– 

06), whichever occurs later. 

(2) Within 18 months after July 6, 2000. 

Note 1: For the purposes of this AD, a 

detailed visual inspection is defined as: ‘‘An 

intensive visual examination of a specific 

structural area, system, installation, or 

assembly to detect damage, failure, or 

irregularity. Available lighting is normally 

supplemented with a direct source of good 

lighting at intensity deemed appropriate by 

the inspector. Inspection aids such as mirror, 

magnifying lenses, etc. may be used. Surface 

cleaning and elaborate access procedures 

may be required.’’ 

Corrective Actions 

(h) If any discrepancy is detected during 

any inspection required by paragraph (g) of 

this AD: Prior to further flight, remove the 

Teflon sleeves and perform a detailed visual 

inspection to detect damage of the wiring, in 

accordance with paragraph D. of the 

Accomplishment Instructions of Boeing 

Service Bulletin 767–28A0053, Revision 1, 

dated August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010; as applicable. After the 

effective date of this AD, only Revision 2 of 

Boeing Alert Service Bulletin 767–28A0053 

may be used. 

(1) If no damage to the wiring is detected, 

prior to further flight, install new Teflon 

sleeves in accordance with Boeing Service 

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77792 Federal Register / Vol. 75, No. 239 / Tuesday, December 14, 2010 / Proposed Rules 

Bulletin 767–28A0053, Revision 1, dated 

August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010. 

(2) If any damage to the wiring is detected, 

prior to further flight, accomplish the 

requirements of paragraph (i) of this AD. 

(i) If any damage to the wiring is detected 

during any inspection required by paragraph 

(h) of this AD: Prior to further flight, perform 

a detailed visual inspection to determine if 

the wiring damage was caused by arcing, in 

accordance with paragraph D. of the 

Accomplishment Instructions of Boeing 

Service Bulletin 767–28A0053, Revision 1, 

dated August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010, as applicable. After the 

effective date of this AD, only Revision 2 of 

Boeing Alert Service Bulletin 767–28A0053 

may be used. 

(1) If the wire damage was not caused by 

arcing: Prior to further flight, repair any 

damaged wires or replace the wires with new 

or serviceable wires, as applicable, and 

install new Teflon sleeves; in accordance 

with Boeing Service Bulletin 767–28A0053, 

Revision 1, dated August 5, 1999; or Boeing 

Alert Service Bulletin 767–28A0053, 

Revision 2, dated June 24, 2010. 

(2) If any damage caused by arcing is 

found: Prior to further flight, perform an 

inspection for signs of fuel inside the conduit 

or on the wires, in accordance with Boeing 

Service Bulletin 767–28A0053, Revision 1, 

dated August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010. 

(i) If no sign of fuel is found, accomplish 

the actions specified by paragraphs 

(i)(2)(i)(A), (i)(2)(i)(B), (i)(2)(i)(C), and 

(i)(2)(i)(D) of this AD. 

(A) Prior to further flight, repair the wires 

or replace the wires with new or serviceable 

wires, as applicable, in accordance with 

Boeing Service Bulletin 767–28A0053, 

Revision 1, dated August 5, 1999; or Boeing 

Alert Service Bulletin 767–28A0053, 

Revision 2, dated June 24, 2010. 

(B) Prior to further flight, install new 

Teflon sleeves, in accordance with Boeing 

Service Bulletin 767–28A0053, Revision 1, 

dated August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010. 

(C) Repeat the inspection for signs of fuel 

inside the conduit thereafter at intervals not 

to exceed 500 flight hours, until the 

requirements of paragraph (h)(2)(i)(D) of this 

AD have been accomplished. If any fuel is 

found inside the conduit during any 

inspection required by this paragraph, prior 

to further flight, replace the conduit with a 

new or serviceable conduit in accordance 

with Boeing Service Bulletin 767–28A0053, 

Revision 1, dated August 5, 1999; or Boeing 

Alert Service Bulletin 767–28A0053, 

Revision 2, dated June 24, 2010. Thereafter, 

repeat the inspection specified in paragraph 

(g) of this AD at intervals not to exceed 

60,000 flight hours or 30,000 flight cycles, 

whichever occurs first. 

(D) Within 6,000 flight hours or 18 months 

after the initial fuel inspection specified by 

paragraph (h)(2) of this AD, whichever occurs 

first, replace the conduit with a new or 

serviceable conduit, in accordance with 

Boeing Service Bulletin 767–28A0053, 

Revision 1, dated August 5, 1999; or Boeing 

Alert Service Bulletin 767–28A0053, 

Revision 2, dated June 24, 2010. Such 

conduit replacement constitutes terminating 

action for the repetitive fuel inspections 

required by paragraph (i)(2)(i)(C) of this AD. 

(ii) If any fuel is found in the conduit or 

on any wire: Prior to further flight, replace 

the conduit with a new or serviceable 

conduit, replace damaged wires with new or 

serviceable wires, and install new Teflon 

sleeves; in accordance with Boeing Service 

Bulletin 767–28A0053, Revision 1, dated 

August 5, 1999; or Boeing Alert Service 

Bulletin 767–28A0053, Revision 2, dated 

June 24, 2010. Thereafter, repeat the 

inspection specified in paragraph (a) of this 

AD at intervals not to exceed 60,000 flight 

hours or 30,000 flight cycles, whichever 

occurs first. 

Pump Retest 

(j) For any wire bundle removed and 

reinstalled during any inspection required by 

this AD: Prior to further flight after such 

reinstallation, retest the fuel pump in 

accordance with paragraph G., H., I., or J., as 

applicable, of the Accomplishment 

Instructions of Boeing Service Bulletin 767– 

28A0053, Revision 1, dated August 5, 1999. 

Reporting Requirement 

(k) Submit a report of positive inspection 

findings (findings of discrepancies only), 

along with any damaged wiring and sleeves, 

to the Seattle Manufacturing Inspection 

District Office (MIDO), 2500 East Valley 

Road, Suite C–2, Renton, Washington 98057– 

3356; fax (425) 227–1159; at the applicable 

time specified in paragraph (k)(1) or (k)(2) of 

this AD. The report must include the airplane 

serial number; the number of total flight 

hours and flight cycles on the airplane; the 

location of the electrical cable on the 

airplane; and a statement indicating, if 

known, whether any wire has ever been 

removed and inspected during maintenance, 

along with the date (if known) of any such 

inspection. Information collection 

requirements contained in this regulation 

have been approved by the Office of 

Management and Budget (OMB) under the 

provisions of the Paperwork Reduction Act of 

1980 (44 U.S.C. 3501 et seq.) and have been 

assigned OMB Control Number 2120–0056. 

(1) For airplanes on which the initial 

inspection required by paragraph (g) of this 

AD is accomplished after July 6, 2000: 

Submit the report within 10 days after 

performing the initial inspection. 

(2) For airplanes on which the initial 

inspection required by paragraph (g) of this 

AD has been accomplished prior to July 6, 

2000: Submit the report for the initial 

inspection within 10 days after the effective 

date of this AD. 

New Reduced Inspection Intervals 

Repetitive Inspections 

(l) Do the inspection required by paragraph 

(g) of this AD at the time specified in 

paragraph (l)(1) or (l)(2) of this AD, as 

applicable, in accordance with Boeing Alert 

Service Bulletin 767–28A0053, Revision 2, 

dated June 24, 2010. Repeat the inspection 

thereafter at intervals not to exceed 15,000 

flight hours. Accomplishing the first 

inspection in this paragraph ends the 

repetitive inspection requirements of 

paragraph (g) of this AD. 

(1) For airplanes on which the inspection 

required by paragraph (g) of this AD has been 

done as of the effective date of this AD: Do 

the inspection within 15,000 flight hours 

after the most recent inspection or within 

6,000 flight hours after the effective date of 

this AD, whichever occurs later; but not to 

exceed 60,000 flight hours after the most 

recent inspection required by paragraph (g) of 

this AD. 

(2) For airplanes on which the inspection 

required by paragraph (g) of this AD has not 

been done as of the effective date of this AD: 

Do the inspection before the accumulation of 

15,000 total flight hours or within 6,000 

flight hours after the effective date of this AD, 

whichever occurs later. 

Paperwork Reduction Act Burden Statement 

(m) A federal agency may not conduct or 

sponsor, and a person is not required to 

respond to, nor shall a person be subject to 

a penalty for failure to comply with a 

collection of information subject to the 

requirements of the Paperwork Reduction 

Act unless that collection of information 

displays a current valid OMB Control 

Number. The OMB Control Number for this 

information collection is 2120–0056. Public 

reporting for this collection of information is 

estimated to be approximately 5 minutes per 

response, including the time for reviewing 

instructions, completing and reviewing the 

collection of information. All responses to 

this collection of information are mandatory. 

Comments concerning the accuracy of this 

burden and suggestions for reducing the 

burden should be directed to the FAA at: 800 

Independence Ave., SW., Washington, DC 

20591, Attn: Information Collection 

Clearance Officer, AES–200. 

Alternative Methods of Compliance 

(AMOCs) 

(n)(1) The Manager, Seattle Aircraft 

Certification Office (ACO), 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: 

Douglas Bryant, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, Seattle 

ACO, 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone (425) 

917–6505; fax (425) 917–6590. Information 

may be e-mailed to: 9–ANM–Seattle-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 

Office. The AMOC approval letter must 

specifically reference this AD. 

(3) AMOCs approved previously in 

accordance with AD 2000–11–06, 

Amendment 39–11754, are approved as 

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Federal Register / Vol. 75, No. 239 / Tuesday, December 14, 2010 / Proposed Rules 77793 

alternative methods of compliance with the 

corresponding requirements of this AD. 

Compliance time extensions approved 

previously in accordance with AD 2000–11– 

06 are not approved as alternative methods 

of compliance for the compliance times 

required by paragraph (l) of this AD. 

Issued in Renton, Washington, on 

November 15, 2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–31371 Filed 12–13–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–1158; Directorate 

Identifier 2010–NM–125–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 747 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede an existing airworthiness 

directive (AD) that applies to all Model 

747 airplanes. The existing AD currently 

requires repetitive inspections to detect 

damage of the sleeving and wire 

bundles of the boost pumps of the 

numbers 1 and 4 main fuel tanks, and 

of the auxiliary tank jettison pumps (if 

installed); replacement of any damaged 

sleeving with new sleeving; and repair 

or replacement of any damaged wires 

with new wires. For airplanes on which 

any burned wires are found, the existing 

AD also requires an inspection to detect 

damage of the conduit, and replacement 

of any damaged conduit with a 

serviceable conduit. This proposed AD 

would reduce the initial compliance 

time and repetitive inspection interval 

in the existing AD. This proposed AD 

results from fleet information indicating 

that the repetitive inspection interval in 

the existing AD is too long because 

excessive chafing of the sleeving 

continues to occur much earlier than 

expected between scheduled 

inspections. We are proposing this AD 

to detect and correct abrasion of the 

Teflon sleeving and wires in the 

bundles of the fuel boost pumps for the 

numbers 1 and 4 main fuel tanks and of 

the auxiliary tank jettison pumps (if 

installed), which could result in 

electrical arcing between the wires and 

aluminum conduit and consequent fire 

or explosion of the fuel tank. 

DATES: We must receive comments on 

this proposed AD by January 28, 2011. 

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: Jon 

Regimbal, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6506; 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–2010–1158; Directorate Identifier 

2010–NM–125–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 December 9, 1997, we issued AD 

97–26–07, Amendment 39–10250 (62 

FR 65352, December 12, 1997), for all 

Model 747 airplanes. That AD currently 

requires repetitive inspections to detect 

damage of the sleeving and wire 

bundles of the boost pumps of the 

numbers 1 and 4 main fuel tanks, and 

of the auxiliary tank jettison pumps (if 

installed); replacement of any damaged 

sleeving with new sleeving; and repair 

or replacement of any damaged wires 

with new wires. For airplanes on which 

any burned wires are found, that AD 

also requires an inspection to detect 

damage of the conduit, and replacement 

of any damaged conduit with a 

serviceable conduit. That AD resulted 

from reports of chafing of the sleeving. 

We issued that AD to detect and correct 

abrasion of the Teflon sleeving and 

wires in the bundles of the fuel boost 

pumps for the numbers 1 and 4 main 

fuel tanks and of the auxiliary tank 

jettison pumps (if installed), which 

could result in electrical arcing between 

the wires and the aluminum conduit 

and consequent fire or explosion of the 

fuel tank. 

Actions Since Existing AD Was Issued 

Since we issued AD 97–26–07, we 

received fleet information from the 

manufacturer indicating that excessive 

chafing of the sleeving continues to 

occur much earlier than expected 

between scheduled inspections. Due to 

that fact, the manufacturer has revised 

the service information to reduce the 

repetitive inspection intervals. 

Relevant Service Information 

We have reviewed Boeing Alert 

Service Bulletin 747–28A2204, Revision 

3, dated March 11, 2010. The service 

information reduces the initial 

compliance time and repetitive 

inspection interval for detecting damage 

WReier-Aviles on DSKGBLS3C1PROD with PROPOSALS