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

28 

Vol. 76, No. 1 

Monday, January 3, 2011 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0908; Directorate 

Identifier 2009–NM–067–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental notice of 

proposed rulemaking (NPRM); 

reopening of comment period. 

SUMMARY: We are revising an earlier 

proposed airworthiness directive (AD) 

for the products listed above. That 

NPRM proposed replacing the power 

control relays for the fuel boost pumps 

and override pumps with new relays 

having a ground fault interrupt (GFI) 

feature. That NPRM was prompted by 

results from fuel system reviews 

conducted by the manufacturer. This 

action revises that NPRM for all 

airplanes by proposing to require an 

electrical bonding resistance 

measurement for certain GFI relays to 

verify that certain bonding requirements 

are met. This action also revises that 

NPRM by proposing to require, for 

certain airplanes, an inspection to 

ensure that certain screws are properly 

installed, and re-installing longer screws 

if necessary. We are proposing this 

supplemental NPRM to prevent damage 

to the fuel pumps caused by electrical 

arcing that could introduce an ignition 

source in the fuel tank, which, in 

combination with flammable fuel 

vapors, could result in a fuel tank 

explosion and consequent loss of the 

airplane. Since these actions impose an 

additional burden over that proposed in 

the NPRM, we are reopening the 

comment period to allow the public the 

chance to comment on these proposed 

changes. 

DATES: We must receive comments on 

this supplemental NPRM 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 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 

(phone: 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Georgios Roussos, Aerospace Engineer, 

Systems and Equipment Branch, ANM– 

130S, Seattle Aircraft Certification 

Office, FAA, 1601 Lind Avenue, SW., 

Renton, Washington 98057–3356; 

telephone (425) 917–6482; fax (425) 

917–6590; e-mail: 

Georgios.Roussos@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–2009–0908; Directorate Identifier 

2009–NM–067–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 issued an NPRM to amend 14 CFR 

part 39 to include an airworthiness 

directive (AD) that would apply to 

certain Model 757–200, –200PF, 

–200CB, and –300 series airplanes. That 

NPRM was published in the Federal 

Register on October 19, 2009 (74 FR 

53436). That NPRM proposed to require 

replacing the power control relays for 

the fuel boost pumps and override 

pumps with new relays having a ground 

fault interrupt (GFI) feature. 

Actions Since Previous NPRM Was 

Issued 

Since we issued the previous NPRM, 

Boeing has issued Service Bulletins 

757–28A0078 and 757–28A0079, both 

Revision 1, both dated August 24, 2010. 

In the previous NPRM, we referred to 

Boeing Alert Service Bulletins 757– 

28A0078 and 757–28A0079, both dated 

July 16, 2008, as the appropriate sources 

of service information. The procedures 

in Revision 1 of these service bulletins 

are essentially the same as those in the 

original issues; however, Revision 1 of 

these service bulletins also includes the 

following new actions: 

• For all airplanes: Adds bonding 

resistance measurements of the GFI 

relays installed on the P33 and P37 

panels to verify that certain bonding 

requirements are met. 

• For airplanes on which the original 

issue of these service bulletins has been 


srobinson on DSKHWCL6B1PROD with PROPOSALS
Federal Register / Vol. 76, No. 1 / Monday, January 3, 2011 / Proposed Rules 29 

done: Adds general visual inspection to 

ensure that the installation screws used 

to secure the GFI relays have enough 

grip length to hold the screws to each 

nutplate. The original screws were 

shorter and might not have been 

installed properly. Revision 1 of these 

service bulletins specifies installation of 

longer screws if necessary. 

• For all airplanes: Corrects the part 

number for the screws used to install 

the relays and adds substitution 

information for installation screws. 

Comments 

We gave the public the opportunity to 

comment on the previous NPRM. The 

following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request To Change Wording in NPRM 

Boeing requested that we change the 

wording in the paragraph of the NPRM 

titled, ‘‘FAA’s Determination and 

Requirements of This Proposed AD.’’ 

The paragraph states in part: 

‘‘Airworthiness Limitation (AWL) 28– 

AWL–21 of Section 9 of the Boeing 757 

Maintenance Planning Document (MPD) 

Document, D622N001–9, Revision 

March 2008, which was required by AD 

2008–10–11, is also related to this 

proposed AD by including a repetitive 

operational test of the GFI relays, and 

repair of any failed GFI relay to ensure 

continued functionality of the GFI 

circuit.’’ Boeing pointed out that AWL 

28–AWL–21 does not mention repair of 

any failed GFI relay and requested that 

the phrase ‘‘and repair of any failed GFI 

relay’’ be deleted from that paragraph of 

the NPRM. 

We agree with Boeing’s statement that 

AWL 28–AWL–21 of Section 9 of the 

Boeing 757 Maintenance Planning 

Document (MPD) Document, 

D622N001–9, Revision March 2008, 

does not describe repair of the GFI 

relays. The intent of the repair statement 

in the original NPRM was to show that 

if a maintenance check fails, it should 

be followed by a system repair and 

retest before pump operation. The 

correction can be a replacement of the 

GFI relay, its repair, or some other 

means identified in the airplane 

maintenance manual. However, the 

paragraph referenced by the commenter 

is not restated in this supplemental 

NPRM. Therefore, no change to this 

supplemental NPRM is necessary in this 

regard. 

Request To Permit Incorporation of 

Universal Fault Interrupter (UFI) 

TDG Aerospace requested that we 

change the previous NPRM to reflect 

incorporation of a UFI it produces as an 

approved means of compliance for 

providing electrical fault protection for 

the center fuel tank override boost 

pumps. Thomson Airways, Jet2.com, 

FedEx, Continental Airlines, American 

Airlines, and DHL support TDG 

Aerospace’s request. TDG Aerospace 

stated that FAA Supplemental Type 

Certificate (STC) ST01950LA, issued 

January 17, 2007, installs the TDG 

Aerospace UFI on Model 757 airplanes. 

TDG Aerospace pointed out that the 

UFIs have been approved as an 

alternative method of compliance 

(AMOC) with the requirements of 

paragraph (g) of AD 2008–11–07, 

Amendment 39–15529 (73 FR 30755, 

May 29, 2008), and paragraph (e) of AD 

2002–24–51, Amendment 39–12900 (67 

FR 61253, September 30, 2002), for 

certain Model 757–200 and 757–300 

airplanes. 

We acknowledge the commenter’s 

request to allow the incorporation of the 

TDG Aerospace UFI for compliance 

with this supplemental NPRM. We will 

be working closely with TDG Aerospace 

on this issue; however, we have not yet 

completed evaluating the STC (STC 

ST01950LA) against the GFI-specific 

requirements of this supplemental 

NPRM. We issued AMOC approvals for 

certain requirements of ADs 2008–11– 

07 and 2002–24–51 in reference to 

potential ignition due to the generation 

of sparks caused by metal-to-metal 

contact during dry fuel pump operation, 

rather than generation by electrical 

arcing that this supplemental NPRM 

addresses. If substantiating data 

demonstrate that the TDG Aerospace 

UFI will provide an acceptable level of 

safety, we might consider reflecting 

incorporation of the STC as an option 

when we issue the final rule AD. We 

have not changed the supplemental 

NPRM in this regard. 

Request Use of Substitutes for Common 

Hardware 

American Airlines requested that 

operators be allowed to use substitutes 

for common hardware such as washers, 

nuts, bolts, shims, sealants, and 

adhesives that have been determined to 

be equivalent to the operator’s parts 

management system. American Airlines 

stated that the Parts Disposition 

Authority for American Airlines is 

contained in the engineering procedures 

manual (EPM), which is incorporated by 

reference into the general manual that is 

required by the FAA-approved 

operations specification. The 

commenter stated that the EPM defines 

the process by which parts equivalency 

can be established. American Airlines 

stated that using approved substitutes 

for common hardware will eliminate 

unnecessary AMOC requests for 

equivalent hardware. 

We disagree with the request to allow 

the use of substitutes for common 

hardware. Common hardware, as 

detailed above, in certain cases may 

play an integral role in the safety and 

integrity of the installation. The specific 

importance of common hardware may 

not always be obvious, and parts 

equivalency can only be assessed and 

addressed by an engineering review of 

the system and its installation. 

Operators may use the approved 

fastener and process material 

substitutions listed in the 

Accomplishment Instructions of Boeing 

Service Bulletins 757–28A0078 and 

757–28A0079, both Revision 1, both 

dated August 24, 2010, as applicable. 

According to the provisions of 

paragraph (k) of this AD, operators may 

request approval of an AMOC to use 

substitutes for common hardware, if the 

request is submitted with substantiating 

data that demonstrate the substitutes for 

common hardware will provide an 

acceptable level of safety. We have not 

changed the supplemental NPRM in this 

regard. 

Explanation of Changes Made to This 

Supplemental NPRM 

We have revised this supplemental 

NPRM to identify the legal name of the 

manufacturer as published in the most 

recent type certificate data sheet for the 

affected airplane models. 

Since issuance of the original NPRM, 

we have increased the labor rate used in 

the Costs of Compliance from $80 per 

work-hour to $85 per work-hour. The 

Costs of Compliance information, 

below, reflects this increase in the 

specified hourly rate. 

We have also revised the Costs of 

Compliance in this supplemental NPRM 

to include the cost of the inspection to 

ensure that the installation screws used 

to secure the GFI relays have enough 

grip length to hold the screws to each 

nutplate and the cost of the bonding 

resistance measurement. 

We have been advised that there is an 

error in Boeing Service Bulletins 757– 

28A0078 and 757–28A0079, both 

Revision 1, both dated August 24, 2010. 

The note in paragraph 3.B.12.i(5), refers 

to the left override fuel boost pump 

instead of the right override fuel boost 

pump. Boeing has issued Service 

Bulletin Information Notices (IN) 757– 

28A0078 IN 02 and 757–28A0079 IN 02, 

both dated October 6, 2010, to inform 

operators of the error. We have added a 

new paragraph (i) to this supplemental 

NPRM to reflect this change. 


srobinson on DSKHWCL6B1PROD with PROPOSALS
30 Federal Register / Vol. 76, No. 1 / Monday, January 3, 2011 / Proposed Rules 

FAA’s Determination 

We are proposing this supplemental 

NPRM 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. Certain changes described above 

expand the scope of the original NPRM. 

As a result, we have determined that it 

is necessary to reopen the comment 

period to provide additional 

opportunity for the public to comment 

on this supplemental NPRM. 

Proposed Requirements of the 

Supplemental NPRM 

This supplemental NPRM would 

require accomplishing the actions 

specified in the service information 

described previously. 

Costs of Compliance 

We estimate that this proposed AD 

will affect 696 airplanes of U.S. registry. 

We estimate the following costs to 

comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product Cost on U.S. operators 

Replacement, measurement, and operational test.7 work-hours × $85 per hour = $595 ..... $12,600 $13,195 Up to $9,183,720.1

Inspection of screw installation and 

bonding resistance measurement.

1 work-hour × $85 per hour = $85 ........ 0 85 $59,160. 

1The cost on U.S. operators depends on airplane configuration. 

We estimate the following costs to do 

the inspection to ensure that certain 

installation screws have sufficient grip 

length for airplanes on which the 

original issue of the service bulletins 

has been incorporated. We have no way 

of determining the number of airplanes 

that might need this inspection: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Installation of longer screw ............................................... 1 work-hour × $85 per hour = $85 .................................. $0 $85 

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), 

(3) Will not affect intrastate aviation 

in Alaska, 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 adding 

the following new airworthiness 

directive (AD): 

The Boeing Company: Docket No. FAA– 

2009–0908; Directorate Identifier 2009– 

NM–067–AD. 

Comments Due Date 

(a) We must receive comments by January 

28, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to The Boeing 

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

and –300 series airplanes, certificated in any 

category; as identified in the applicable 

service bulletin specified in paragraph (c)(1) 

or (c)(2) of this AD. 

(1) For Model 757–200, –200PF, and 

–200CB series airplanes: Boeing Service 

Bulletin 757–28A0078, Revision 1, dated 

August 24, 2010. 

(2) For Model 757–300 series airplanes: 

Boeing Service Bulletin 757–28A0079, 

Revision 1, dated August 24, 2010. 

Subject 

(d) Joint Aircraft System Component 

(JASC)/Air Transport Association (ATA) of 

America Code 28, Fuel. 

Unsafe Condition 

(e) This AD was prompted by fuel system 

reviews conducted by the manufacturer. We 


srobinson on DSKHWCL6B1PROD with PROPOSALS
Federal Register / Vol. 76, No. 1 / Monday, January 3, 2011 / Proposed Rules 31 

are issuing this AD to prevent damage to the 

fuel pumps caused by electrical arcing that 

could introduce an ignition source in the fuel 

tank, which, in combination with flammable 

fuel vapors, could result in a fuel tank 

explosion and consequent loss of the 

airplane. 

Compliance 

(f) Comply with this AD within the 

compliance times specified, unless already 

done. 

Replacement, Measurements and Test 

(g) For airplanes on which the actions 

specified in Boeing Alert Service Bulletin 

757–28A0078 or 757–28A0079, both dated 

July 16, 2008, have not been accomplished as 

of the effective date of this AD: Within 60 

months after the effective date of this AD, 

replace the power control relays for the fuel 

boost pumps and override pumps with new 

relays having a ground fault interrupt (GFI) 

feature; do applicable electrical bonding 

resistance measurements between the GFI 

relays and their installation panel to verify 

that applicable bonding requirements are 

met; and do an operational test to ensure 

correct operation, as specified in Boeing 

Service Bulletin 757–28A0078, Revision 1, 

dated August 24, 2010 (for Model 757–200, 

–200CB, and –200PF airplanes); or Boeing 

Service Bulletin 757–28A0079, Revision 1, 

dated August 24, 2010 (for Model 757–300 

airplanes). Do all actions in accordance with 

Part 1 of the Accomplishment Instructions of 

Boeing Service Bulletin 757–28A0078, 

Revision 1, dated August 24, 2010 (for Model 

757–200, –200CB, and –200PF airplanes); or 

Boeing Service Bulletin 757–28A0079, 

Revision 1, dated August 24, 2010 (for Model 

757–300 airplanes); except as required by 

paragraph (i) of this AD. 

Inspection 

(h) For airplanes on which the actions 

specified in Boeing Alert Service Bulletin 

757–28A0078 or 757–28A0079, both dated 

July 16, 2008, have been accomplished before 

the effective date of this AD: Within 60 

months after the effective date of this AD, do 

a general visual inspection to verify that each 

GFI installation screw has enough grip length 

to hold the screws in each nut plate; and do 

applicable electrical bonding resistance 

measurements between the GFI relays and 

their installation panel to verify that 

applicable bonding requirements are met. If 

the screw does not have enough grip length, 

before further flight, install a longer screw. 

Do all actions in accordance with Part 2 of 

the Accomplishment Instructions of Boeing 

Service Bulletin 757–28A0078, Revision 1, 

dated August 24, 2010 (for Model 757–200, 

–200CB, and –200PF airplanes); or Boeing 

Service Bulletin 757–28A0079, Revision 1, 

dated August 24, 2010 (for Model 757–300 

airplanes). 

Exception to the Service Information 

(i) The note in paragraph 3.B.12.i(5) of Part 

1 of the Accomplishment Instructions of 

Boeing Service Bulletins 757–28A0078 and 

757–28A0079, both Revision 1, both dated 

August 24, 2010, should read, ‘‘NOTE: The 

right override fuel boost pump PRESS light 

stays off when the pump switch is turned to 

OFF.’’ 

Paperwork Reduction Act Burden Statement 

(j) 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) 

(k)(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. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the ACO, send it to the 

attention of the person identified in the 

Related Information section of this AD. 

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

(2) Before using any approved AMOC, 

notify your Principal Maintenance Inspector 

or Principal Avionics Inspector, as 

appropriate, or lacking a principal inspector, 

your local Flight Standards District Office. 

Related Information 

(l) For more information about this AD, 

contact Georgios Roussos, Aerospace 

Engineer, Systems and Equipment Branch, 

ANM–130S, Seattle ACO, FAA, 1601 Lind 

Avenue, SW., Renton, Washington 98057– 

3356; telephone (425) 917–6482; fax (425) 

917–6590. Or, e-mail information to 9-ANMSeattle-ACO-AMOC-Requests@faa.gov; email: Georgios.Roussos@faa.gov. 

(m) For service information identified in 

this 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. 

Issued in Renton, Washington, on 

December 23, 2010. 

John P. Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2010–33129 Filed 12–30–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–1272; Directorate 

Identifier 2010–NM–226–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 727, 727C, 727–100, 

727–100C, 727–200, and 727–200F 

Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for the 

products listed above. This proposed 

AD would require replacing the existing 

unshielded fuel quantity indication 

system (FQIS) wire bundles with double 

shielded FQIS wire bundles, installing a 

new wire feed-through fitting, and 

grounding the wire shields, as 

applicable; and doing repetitive low 

frequency eddy current (LFEC) 

inspections for cracking of the fuselage 

skin, and corrective actions if necessary. 

This proposed AD also would require 

revising the maintenance program to 

incorporate certain airworthiness 

limitations. This proposed AD was 

prompted by fuel system reviews 

conducted by the manufacturer. We are 

proposing this AD to increase the level 

of protection from lightning strikes and 

prevent the potential of ignition sources 

inside fuel tanks, which, in combination 

with flammable fuel vapors, could result 

in fuel tank explosions and consequent 

loss of the airplane. 

DATES: We must receive comments on 

this proposed AD by February 17, 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: Deliver to Mail 

address above between 9 a.m. and 5 


srobinson on DSKHWCL6B1PROD with PROPOSALS