25970 Federal Register / Vol. 73, No. 90 / Thursday, May 8, 2008 / Rules and Regulations 

by this AD, unless the AD specifies 

otherwise. 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

Snow Engineering Co. Service Letter #253, 

Rev. C, dated April 17, 2008; Snow 

Engineering Co. Service Letter #253, Rev. B, 

dated November 30, 2007; and Snow 

Engineering Co. Service Letter #253 Rev. A, 

dated October 16, 2007, under 5 U.S.C. 552(a) 

and 1 CFR part 51. 

(2) On August 10, 2007 (72 FR 36863, July 

6, 2007), the Director of the Federal Register 

approved the incorporation by reference of 

Snow Engineering Co. Service Letter #253, 

revised January 22, 2007. 

(3) For service information identified in 

this AD, contact Air Tractor Inc., P.O. Box 

485, Olney, Texas 76374; telephone: (940) 

564–5616; fax: (940) 564–5612. 

(4) You may review copies at the FAA, 

Central Region, Office of the Regional 

Counsel, 901 Locust, Kansas City, Missouri 

64106; or at the National Archives and 

Records Administration (NARA). For 

information on the availability of this 

material at NARA, call 202–741–6030, or go 

to http://www.archives.gov/federal_register/

code_of_federal_regulations/ 

ibr_locations.html. 

Issued in Kansas City, Missouri, on April 

30, 2008. 

Patrick R. Mullen, 

Acting Manager, Small Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. E8–9925 Filed 5–7–08; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2007–28383; Directorate 

Identifier 2006–NM–180–AD; Amendment 

39–15515; AD 2008–10–09] 

RIN 2120–AA64 

Airworthiness Directives; Boeing 

Model 737–100, –200, –200C, –300, 

–400, and –500 Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for all 

Boeing Model 737–100, –200, –200C, 

–300, –400, and –500 series airplanes. 

This AD requires revising the FAAapproved maintenance program to 

incorporate new airworthiness 

limitations (AWLs) for fuel tank systems 

to satisfy Special Federal Aviation 

Regulation No. 88 requirements. This 

AD also requires the initial inspection of 

a certain repetitive AWL inspection to 

phase in that inspection, and repair if 

necessary. This AD results from a design 

review of the fuel tank system. We are 

issuing this AD to prevent the potential 

for ignition sources inside fuel tanks 

caused by latent failures, alterations, 

repairs, or maintenance actions, which, 

in combination with flammable fuel 

vapors, could result in a fuel tank 

explosion and consequent loss of the 

airplane. 

DATES: This AD is effective June 12, 

2008. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of June 12, 2008. 

ADDRESSES: For service information 

identified in this AD, contact Boeing 

Commercial Airplanes, P.O. Box 3707, 

Seattle, Washington 98124–2207. 

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 AD, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

Docket Office (telephone 800–647–5527) 

is the Document Management Facility, 

U.S. Department of Transportation, 

Docket Operations, M–30, West 

Building Ground Floor, Room W12–140, 

1200 New Jersey Avenue, SE., 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Sue 

Lucier, Aerospace Engineer, Propulsion 

Branch, ANM–140S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue, SW., Renton, Washington 

98057–3356; telephone (425) 917–6438; 

fax (425) 917–6590. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an airworthiness 

directive (AD) that would apply to all 

Boeing Model 737–100, –200, –200C, 

–300, –400, and –500 series airplanes. 

That NPRM was published in the 

Federal Register on July 6, 2007 (72 FR 

36907). That NPRM proposed to require 

revising the FAA-approved maintenance 

program to incorporate new 

airworthiness limitations (AWLs) for 

fuel tank systems to satisfy Special 

Federal Aviation Regulation No. 88 

requirements. That NPRM also proposed 

to require the initial inspection of a 

certain repetitive AWL inspection to 

phase in that inspection, and repair if 

necessary. 

Actions Since NPRM Was Issued 

Since we issued the NPRM, Boeing 

has issued Revision March 2008 of the 

737–100/200/200C/300/400/500 

Airworthiness Limitations (AWLs) and 

Certification Maintenance Requirements 

(CMRs), D6–38278–CMR (hereafter 

referred to as ‘‘Revision March 2008 of 

Document D6–38278–CMR’’). The 

NPRM referred to Revision May 2006 of 

Document D6–38278–CMR as the 

appropriate source of service 

information for accomplishing the 

proposed actions. Revision March 2008 

of Document D6–38278–CMR, among 

other actions, includes the following 

changes: 

• Removes the repetitive task interval 

of 36,000 flight cycles from AWLs No. 

28–AWL–01 and No. 28–AWL–03. 

• Revises the task description for 

AWL No. 28–AWL–01 to harmonize it 

with AWL No. 28–AWL–02 by removing 

references to certain station numbers. 

• Revises AWL No. 28–AWL–03 to 

reflect the new maximum loop 

resistance values associated with the 

lightning protection of the 

unpressurized fuel quantity indicating 

system (FQIS) wire bundle installations. 

Accordingly, we have revised 

paragraphs (f), (g), and (h) of this AD to 

refer to Revision March 2008 of 

Document D6–38278–CMR. We also 

have added a new paragraph (j) to this 

AD specifying that actions done before 

the effective date of this AD in 

accordance with Revisions May 2006 

through November 2007 of Document 

D6–38278–CMR are acceptable for 

compliance with the corresponding 

requirements of paragraphs (g) and (h) 

of this AD. 

We also have removed reference to 

36,000 total flight hours from paragraph 

(h)(1) of this AD and revised the initial 

threshold for accomplishing AWL No. 

28–AWL–03 to within 120 months since 

the date of issuance of the original 

standard airworthiness certificate or the 

date of issuance of the original export 

certificate of airworthiness. 

Operators should note that paragraph 

(g) of this AD requires only 

incorporating AWLs No. 28–AWL–01 

through No. 28–AWL–20 inclusive for 

Model 737–100, –200, and –200C series 

airplanes, and AWLs No. 28–AWL–01 

through No. 28–AWL–19 inclusive for 

Model 737–300, –400, and –500 series 

airplanes. Revision September 2006 of 

Document D6–38278–CMR added AWL 

inspections of the fuel boost pump auto 

shutoff system for the center and 

auxiliary fuel tanks (specified as AWLs 

No. 28–AWL–20 and No. 28–AWL–21 

for Model 737–300, –400, and –500 

series airplanes, and AWLs No. 28–


pwalker on PROD1PC71 with RULES
Federal Register / Vol. 73, No. 90 / Thursday, May 8, 2008 / Rules and Regulations 25971 

AWL–21 and No. 28–AWL–22 for 

Model 737–100, –200, and –200C series 

airplanes). Revision November 2007 of 

Document D6–38278–CMR added an 

AWL inspection of the boost pump 

ground fault interrupter (specified as 

AWL No. 28–AWL–22 for Model 737–

300, –400, and –500 series airplanes, 

and AWL No. 28–AWL–23 for Model 

737–100, –200, and –200C series 

airplanes). We might issue additional 

rulemaking to require the incorporation 

of those AWLs. However, as an optional 

action, operators may incorporate those 

AWLs as specified in paragraph (g) of 

this AD. 

Other Changes Made to This AD 

For standardization purposes, we 

have revised this AD in the following 

ways: 

• We have added a new paragraph (i) 

to this AD to specify that no alternative 

inspections, inspection intervals, or 

critical design configuration control 

limitations (CDCCLs) may be used 

unless they are part of a later approved 

revision of Revision March 2008 of 

Document D6–38278–CMR, or unless 

they are approved as an alternative 

method of compliance (AMOC). 

Inclusion of this paragraph in the AD is 

intended to ensure that the ADmandated airworthiness limitations 

changes are treated the same as the 

airworthiness limitations issued with 

the original type certificate. 

• We have revised Note 1 of this AD 

to clarify that an operator must request 

approval for an AMOC if the operator 

cannot accomplish the required 

inspections because an airplane has 

been previously modified, altered, or 

repaired in the areas addressed by the 

required inspections. 

• We have revised paragraph (h) of 

this AD to specify that accomplishing 

AWL No. 28–AWL–03 as part of an 

FAA-approved maintenance program 

before the applicable compliance time 

constitutes compliance with the 

applicable requirements of that 

paragraph. 

• We have deleted Appendix 1 and 

Appendix 2 from this AD, since 

Revision March 2008 of Document D6–

38278–CMR already contains most of 

the updated information that is listed in 

those appendices of the NPRM. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

considered the comments received from 

the five commenters. 

Request To Revise the Loop Resistance 

Values for AWL No. 28–AWL–03 

Boeing, KLM Royal Dutch Airlines 

(KLM), and Lufthansa state that the loop 

resistance values for AWL No. 28–

AWL–03 specified in Revision May 

2006 of Document D6–38278–CMR are 

going to be revised, since those values 

are relevant for production airplanes. 

The commenters also state that the 

revised values will be more 

representative of the expected values for 

in-service airplanes. Boeing points out 

that, according to paragraph (h) of the 

NPRM, the revised values should be 

able to be used in accordance with a 

later revision of the CMR if the revision 

is approved by the Seattle Aircraft 

Certification Office (ACO), FAA. 

We agree that operators may use the 

revised loop resistance values for AWL 

No. 28–AWL–03 in accordance with 

Revision March 2008 of Document D6–

38278–CMR. As stated previously, we 

have revised this AD accordingly. 

Request To Revise Intervals for Certain 

AWL Inspections 

KLM, on behalf of several operators, 

requests that we review a 45-page 

proposal to align certain airworthiness 

limitation item (ALI) intervals with the 

applicable maintenance significant item 

(MSI) and enhanced zonal analysis 

procedure (EZAP) intervals for Model 

737, 747, 757, 767, and 777 airplanes. 

The recommendations in that proposal 

ensure that the ALI intervals align with 

the maintenance schedules of the 

operators. Among other changes, the 

proposal recommends extending certain 

AWL inspection intervals from 10 years/ 

36,000 flight cycles to 12 years for 

Model 737–100, –200, –300, –400, and 

–500 series airplanes. 

Lufthansa and the Air Transport 

Association (ATA), on behalf of its 

member U.S. Airways, both note an 

inconsistency between the inspection 

interval specified in Revision May 2006 

of Document D6–38278–CMR and the 

compliance threshold specified in 

paragraph (h)(1) of the NPRM. The 

NPRM specifies accomplishing the 

initial inspection within 36,000 total 

flight hours or 120 months since the 

date of issuance of the original standard 

airworthiness certificate or the date of 

issuance of the original export 

certificate of airworthiness, whichever 

occurs first. However, Revision May 

2006 of Document D6–38278–CMR 

specifies a repetitive interval of 36,000 

total flight cycles or 120 months, 

whichever occurs first. U.S. Airways 

requests we verify whether the initial 

inspection interval should be in units of 

flight cycles or flight hours. 

We disagree with KLM’s request to 

extend certain AWL inspection intervals 

to 12 years. However, as stated 

previously, we have deleted the 36,000- 

total-flight-hour parameter from 

paragraph (h)(1) of this AD to 

correspond with the task interval for 

AWL No. 28–AWL–03 as specified in 

Revision March 2008 of Document D6–

38278–CMR. In developing an 

appropriate compliance time for this 

action, we considered the urgency 

associated with the subject unsafe 

condition and the practical aspect of 

accomplishing the required actions 

within a period of time that corresponds 

to the normal scheduled maintenance 

for most affected operators. However, 

according to the provisions of paragraph 

(k) of this AD, we might approve 

requests to adjust the compliance time 

if the request includes data that prove 

that the new compliance time would 

provide an acceptable level of safety. 

Request To Revise Note 1 

Boeing requests that we revise Note 1 

of the NPRM to clarify the need for an 

AMOC. Boeing states that the current 

wording is difficult to follow, and that 

the note is meant to inform operators 

that an AMOC to the required AWLs 

might be required if an operator has 

previously modified, altered, or repaired 

the areas addressed by the limitations. 

Boeing requests that we revise Note 1 as 

follows: 

• Add the words ‘‘according to 

paragraph (g)’’ at the end of the first 

sentence. 

• Replace the words ‘‘revision to’’

with ‘‘deviation from’’ in the last 

sentence. 

• Delete the words ‘‘(g) or’’ and ‘‘as 

applicable’’ from the last sentence. 

As stated previously, we have 

clarified the language in Note 1 of this 

AD for standardization with other 

similar ADs. The language the 

commenter requests that we change 

does not appear in the revised note. 

Therefore, no additional change to this 

AD is necessary in this regard. 

Request To Extend the Grace Period for 

AWL No. 28–AWL–03 

KLM expects to have problems 

accomplishing the initial inspection of 

AWL No. 28–AWL–03 within the 24- 

month grace period. The commenter 

states that if it does the check and does 

not reach the specified values, then tank 

entry outside of heavy maintenance 

would be necessary. The commenter 

also states that it would be helpful to 

plan to do this inspection during an 

overhaul. 

We infer that KLM requests that we 

extend the grace period for AWL No. 


pwalker on PROD1PC71 with RULES
25972 Federal Register / Vol. 73, No. 90 / Thursday, May 8, 2008 / Rules and Regulations 

28–AWL–03 in paragraph (h) of this AD 

to allow accomplishing the initial 

inspection during a regularly scheduled 

‘‘D’’ check (about 6 years). We disagree 

with extending the grace period to 6 

years. In developing an appropriate 

compliance time for this action, we 

considered the safety implications, the 

rate of lightning strikes in the fleet, and 

the average age of the fleet. In 

consideration of these items, we have 

determined that an initial compliance 

time of 120 months (as discussed 

previously) with a grace period of 24 

months will ensure an acceptable level 

of safety. We have not changed the grace 

period for AWL No. 28–AWL–03 in this 

regard. 

Request To Add Applicability to 

Paragraph (g) 

Lufthansa states that the applicability 

of the AWL tasks should be included in 

the AWL table of the AD. 

We infer the commenter requests that 

we include the applicability for AWL 

No. 28–AWL–03 in paragraph (g) of this 

AD. (The commenter made the same 

request for a similar NPRM, which 

contained an ‘‘AWL table.’’) We agree to 

add the airplane applicability to 

paragraph (g) of this AD because AWL 

No. 28–AWL–03 only applies to 

airplanes on which certain design 

changes have been incorporated. We 

have revised paragraph (g) of this AD 

accordingly. 

Request To Clarify Need for AMOCs 

The ATA, on behalf of its member 

U.S. Airways, requests that we clarify 

whether operators must obtain AMOCs 

for AWLs that are not applicable to their 

airplanes. U.S. Airways also requests 

that we clarify that some of the items 

identified in Appendix 2 of the NPRM 

might not be applicable to all Model 

737–300, –400, and –500 series 

airplanes. U.S. Airways states that it 

will not be able to comply with certain 

AWL inspections or CDCCLs because it 

has not incorporated the relevant 

service bulletins identified in Revision 

May 2006 of Document D6–38278–CMR 

on several of its airplanes. 

Document D6–38278–CMR contains 

an applicability column that identifies 

the airplane configuration to which the 

AWL applies. The AWL is required only 

for those airplanes that have that 

configuration. If the applicability 

column identifies a service bulletin, 

then the operator would not need to 

adhere to the AWL until the airplane is 

modified in accordance with that 

service bulletin. There is no need to 

obtain an AMOC for airplanes that have 

not been modified. We agree that some 

of the items identified in Appendix 2 of 

the NPRM might not be applicable to all 

Model 737–300, –400, and –500 series 

airplanes. However, no change to this 

AD is necessary in this regard, since we 

have deleted Appendix 2 from this AD. 

Request To Clarify if Latest Revision of 

Document D6–38278–CMR is Required 

The ATA, on behalf of its member 

U.S. Airways, requests that we clarify 

whether the latest revision of Document 

D6–38278–CMR will be incorporated 

into the final rule. The commenters note 

that Boeing has published a later 

revision of Document D6–38278–CMR 

than the one referenced in the NPRM. 

We have revised this AD to refer to 

the latest revision of Document D6–

38278–CMR because paragraphs (g) and 

(h) of this AD allow the use of later 

approved revisions of that document. 

That document has been revised since 

then to include additional AWLs 

associated with the incorporation of 

certain design changes. As stated 

previously, we might require those 

design changes and associated AWLs 

with separate rulemaking actions, but 

operators may choose to incorporate the 

new AWLs before then. 

Request To Clarify Revision Date of 

Document D6–38278–CMR 

The ATA, on behalf of its member 

U.S. Airways, notes that the ‘‘Changes to 

Fuel Tank System AWLs’’ and 

‘‘Exceptional Short-Term Extensions’’

sections of the NPRM refer to Revision 

March 2006 of Document D6–38278–

CMR. U.S. Airways believes that the 

correct revision date should be May 

2006 to match the rest of the NPRM. 

We infer the commenters request that 

we change the revision date to May 

2006. We agree that the NPRM should 

have referred to Revision May 2006 of 

Document D6–38278–CMR because that 

revision, and other later approved 

revisions, are the subject of this AD. 

Revision March 2006 of Document D6–

38278–CMR was originally included in 

the NPRM because the AWLs for fuel 

tank systems were first incorporated in 

that document. However, we have not 

changed this AD since the paragraphs 

that the commenters refer to are not 

retained in the final rule. 

Conclusion 

We reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting the AD 

with the changes described previously. 

We also determined that these changes 

will not increase the economic burden 

on any operator or increase the scope of 

the AD. 

Costs of Compliance 

There are about 2,337 airplanes of the 

affected design in the worldwide fleet. 

The following table provides the 

estimated costs, at an average labor rate 

of $80 per work hour, for U.S. operators 

to comply with this AD. 

ESTIMATED COSTS

Action Work hours Parts Cost per airplane 

Number of 

U.S.-registered 

airplanes 

Fleet cost 

Maintenance program revision ............................................... 8 None ........... $640 672 $430,080 

Inspection ............................................................................... 8 None ........... 640 672 430,080 

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 

This AD will not have federalism 

implications under Executive Order 


pwalker on PROD1PC71 with RULES
Federal Register / Vol. 73, No. 90 / Thursday, May 8, 2008 / Rules and Regulations 25973 

13132. This AD will 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 this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

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. 

Adoption of the Amendment 

■ Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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: 

2008–10–09 Boeing: Amendment 39–15515. 

Docket No. FAA–2007–28383; 

Directorate Identifier 2006–NM–180–AD. 

Effective Date 

(a) This airworthiness directive (AD) is 

effective June 12, 2008. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to all Boeing Model 

737–100, –200, –200C, –300, –400, and –500 

series airplanes, certificated in any category. 

Note 1: This AD requires revisions to 

certain operator maintenance documents to 

include new inspections. Compliance with 

these inspections is required by 14 CFR 

91.403(c). For airplanes that have been 

previously modified, altered, or repaired in 

the areas addressed by these inspections, the 

operator may not be able to accomplish the 

inspections described in the revisions. In this 

situation, to comply with 14 CFR 91.403(c), 

the operator must request approval for an 

alternative method of compliance (AMOC) 

according to paragraph (k) of this AD. The 

request should include a description of 

changes to the required inspections that will 

ensure the continued operational safety of 

the airplane. 

Unsafe Condition 

(d) This AD results from a design review 

of the fuel tank systems. We are issuing this 

AD to prevent the potential for ignition 

sources inside fuel tanks caused by latent 

failures, alterations, repairs, or maintenance 

actions, which, in combination with 

flammable fuel vapors, could result in a fuel 

tank explosion and consequent loss of the 

airplane. 

Compliance 

(e) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Service Information Reference 

(f) The term ‘‘Revision March 2008 of 

Document D6–38278–CMR,’’ as used in this 

AD, means Boeing 737–100/200/200C/300/ 

400/500 Airworthiness Limitations (AWLs) 

and Certification Maintenance Requirements 

(CMRs), D6–38278–CMR, Revision March 

2008. 

Maintenance Program Revision 

(g) Before December 16, 2008, revise the 

FAA-approved maintenance program to 

incorporate the information specified in 

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

applicable; except that the initial inspection 

required by paragraph (h) of this AD must be 

done at the applicable compliance time 

specified in that paragraph. Accomplishing 

the revision in accordance with a later 

revision of Document D6–38278–CMR is an 

acceptable method of compliance if the 

revision is approved by the Manager, Seattle 

Aircraft Certification Office (ACO), FAA. 

(1) For Model 737–100, –200, and –200C 

series airplanes: Section C, ‘‘FUEL SYSTEMS 

AIRWORTHINESS LIMITATIONS,’’

including AWLs No. 28–AWL–01 through 

No. 28–AWL–20 inclusive, of Revision 

March 2008 of Document D6–38278–CMR. 

As an optional action, AWLs No. 28–AWL–

21 through No. 28–AWL–23 inclusive, as 

identified in Section C of Revision March 

2008 of Document D6–38278–CMR, also may 

be incorporated into the FAA-approved 

maintenance program. 

(2) For Model 737–300, –400, and –500 

series airplanes: Section C, ‘‘FUEL SYSTEMS 

AIRWORTHINESS LIMITATIONS,’’

including AWLs No. 28–AWL–01 through 

No. 28–AWL–19 inclusive, Revision March 

2008 of Document D6–38278–CMR. As an 

optional action, AWLs No. 28–AWL–20 

through No. 28–AWL–22 inclusive, as 

identified in Section C of Revision March 

2008 of Document D6–38278–CMR, also may 

be incorporated into the FAA-approved 

maintenance program. 

Initial Inspection and Repair if Necessary 

(h) For the airplanes identified in the 

‘‘Applicability’’ column of AWL No. 28–

AWL–03 of Section C of Revision March 

2008 of Document D6–38278–CMR: At the 

later of the compliance times specified in 

paragraphs (h)(1) and (h)(2) of this AD, do a 

special detailed inspection of the lightning 

shield to ground termination on the out-oftank fuel quantity indication system (FQIS) 

wiring to verify functional integrity, in 

accordance with AWL No. 28–AWL–03 of 

Section C of Revision March 2008 of 

Document D6–38278–CMR. If any 

discrepancy is found during the inspection, 

repair the discrepancy before further flight in 

accordance with AWL No. 28–AWL–03 of 

Section C of Revision March 2008 of 

Document D6–38278–CMR. Accomplishing 

the actions required by this paragraph in 

accordance with a later revision of Document 

D6–38278–CMR is an acceptable method of 

compliance if the revision is approved by the 

Manager, Seattle ACO. Accomplishing AWL 

No. 28–AWL–03 as part of an FAA-approved 

maintenance program before the applicable 

compliance time specified in paragraph (h)(1) 

or (h)(2) of this AD constitutes compliance 

with the requirements of this paragraph. 

Note 2: For the purposes of this AD, a 

special detailed inspection is: ‘‘An intensive 

examination of a specific item, installation, 

or assembly to detect damage, failure, or 

irregularity. The examination is likely to 

make extensive use of specialized inspection 

techniques and/or equipment. Intricate 

cleaning and substantial access or 

disassembly procedure may be required.’’

(1) Within 120 months since the date of 

issuance of the original standard 

airworthiness certification or the date of 

issuance of the original export certificate of 

airworthiness. 

(2) Within 24 months after the effective 

date of this AD. 

No Alternative Inspections, Inspection 

Intervals, or Critical Design Configuration 

Control Limitations (CDCCLs) 

(i) After accomplishing the actions 

specified in paragraphs (g) and (h) of this AD, 

no alternative inspections, inspection 

intervals, or CDCCLs may be used unless the 

inspections, intervals, or CDCCLs are part of 

a later revision of Revision March 2008 of 

Document D6–38278–CMR that is approved 

by the Manager, Seattle ACO; or unless the 

inspections, intervals, or CDCCLs are 

approved as an AMOC in accordance with 

the procedures specified in paragraph (k) of 

this AD. 

Credit for Actions Done According to 

Previous Revisions of the Service 

Information 

(j) Actions done before the effective date of 

this AD in accordance with the Boeing 737–

100/200/200C/300/400/500 Airworthiness 

Limitations (AWLs) and Certification 

Maintenance Requirements (CMRs), D6–

38278–CMR, Revision May 2006; Revision 

September 2006; or Revision November 2007; 

are acceptable for compliance with the 

corresponding requirements of paragraphs (g) 

and (h) of this AD. 

Alternative Methods of Compliance 

(AMOCs) 

(k)(1) The Manager, Seattle ACO, has the 

authority to approve AMOCs for this AD, if 

requested in accordance with the procedures 

found in 14 CFR 39.19. 


pwalker on PROD1PC71 with RULES
25974 Federal Register / Vol. 73, No. 90 / Thursday, May 8, 2008 / Rules and Regulations 

(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 appropriate principal inspector 

(PI) in the FAA Flight Standards District 

Office (FSDO), or lacking a PI, your local 

FSDO. 

Material Incorporated by Reference 

(l) You must use Boeing 737–100/200/ 

200C/300/400/500 Airworthiness Limitations 

(AWLs) and Certification Maintenance 

Requirements (CMRs), D6–38278–CMR, 

Revision March 2008, to do the actions 

required by this AD, unless the AD specifies 

otherwise. 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

this service information under 5 U.S.C. 

552(a) and 1 CFR part 51. 

(2) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, P.O. Box 3707, Seattle, 

Washington 98124–2207. 

(3) You may review copies of the service 

information incorporated by reference at the 

FAA, Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington; or at 

the National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, call 

202–741–6030, or go to: http:// 

www.archives.gov/federal_register/ 

code_of_federal_regulations/ 

ibr_locations.html. 

Issued in Renton, Washington, on April 29, 

2008. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. E8–9922 Filed 5–7–08; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2006–26710; Directorate 

Identifier 2006–NM–147–AD; Amendment 

39–15517; AD 2008–10–11] 

RIN 2120–AA64 

Airworthiness Directives; Boeing 

Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Boeing Model 757 airplanes. This AD 

requires revising the Airworthiness 

Limitations (AWLs) section of the 

Instructions for Continued 

Airworthiness by incorporating new 

limitations for fuel tank systems to 

satisfy Special Federal Aviation 

Regulation No. 88 requirements. This 

AD also requires the initial inspection of 

certain repetitive AWL inspections to 

phase-in those inspections, and repair if 

necessary. This AD results from a design 

review of the fuel tank systems. We are 

issuing this AD to prevent the potential 

for ignition sources inside fuel tanks 

caused by latent failures, alterations, 

repairs, or maintenance actions, which, 

in combination with flammable fuel 

vapors, could result in a fuel tank 

explosion and consequent loss of the 

airplane. 

DATES: This AD becomes effective June 

12, 2008. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of June 12, 2008. 

ADDRESSES: For service information 

identified in this AD, contact Boeing 

Commercial Airplanes, P.O. Box 3707, 

Seattle, Washington 98124–2207. 

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 AD, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

Docket Office (telephone 800–647–5527) 

is the Document Management Facility, 

U.S. Department of Transportation, 

Docket Operations, M–30, West 

Building Ground Floor, Room W12–140, 

1200 New Jersey Avenue, SE., 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Judy 

Coyle, Aerospace Engineer, Propulsion 

Branch, ANM–140S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue, SW., Renton, Washington 

98057–3356; telephone (425) 917–6497; 

fax (425) 917–6590. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The FAA issued a supplemental 

notice of proposed rulemaking (NPRM) 

to amend 14 CFR part 39 to include an 

AD that would apply to all Boeing 

Model 757 airplanes. That supplemental 

NPRM was published in the Federal 

Register on August 1, 2007 (72 FR 

41963). That supplemental NPRM 

proposed to require revising the 

Airworthiness Limitations (AWLs) 

section of the Instructions for Continued 

Airworthiness (ICA) by incorporating 

new limitations for fuel tank systems to 

satisfy Special Federal Aviation 

Regulation No. 88 requirements. That 

supplemental NPRM also proposed to 

require the initial inspection of certain 

repetitive inspections specified in the 

AWLs to phase-in those inspections, 

and repair if necessary. That 

supplemental NPRM also proposed to 

revise the original NPRM by aligning the 

compliance time for revising the AWLs 

section with the compliance date of the 

special maintenance program 

requirements, updating the listing of 

applicable airplane maintenance 

manuals in Appendix 1, and clarifying 

certain actions. 

Actions Since Supplemental NPRM 

Was Issued 

Since we issued the supplemental 

NPRM, Boeing has issued Temporary 

Revision (TR) 09–008, dated March 

2008. Boeing TR 09–008 is published as 

Section 9 of the Boeing 757 

Maintenance Planning Document (MPD) 

Document, D622N001–9, Revision 

March 2008 (hereafter referred to as 

‘‘Revision March 2008 of the MPD’’). 

The supplemental NPRM referred to 

Revision March 2006 of the MPD as the 

appropriate source of service 

information for accomplishing the 

proposed actions. Revision March 2008 

of the MPD, among other actions, 

includes the following changes: 

• Removes the repetitive task interval 

of 36,000 flight cycles from AWLs No. 

28–AWL–01, No. 28–AWL–03, and No. 

28–AWL–14. 

• Revises the task description for 

AWL No. 28–AWL–01 to harmonize it 

with AWL No. 28–AWL–02 by removing 

references to certain station numbers. 

• Revises AWL No. 28–AWL–03 to 

reflect the new maximum loop 

resistance values associated with the 

lightning protection of the 

unpressurized fuel quantity indicating 

system (FQIS) wire bundle installations. 

Accordingly, we have revised 

paragraphs (f), (g), and (h) of this AD to 

refer to Revision March 2008 of the 

MPD. We also have added a new 

paragraph (j) to this AD specifying that 

actions done before the effective date of 

this AD in accordance with Revisions 

March 2006 through November 2007 of 

the MPD are acceptable for compliance 

with the corresponding requirements of 

paragraphs (g) and (h) of this AD. 

We also have removed reference to 

36,000 total flight cycles from Table 1 of 

this AD and revised the initial threshold 

for accomplishing AWLs No. 28–AWL–

01, No. 28–AWL–03, and No. 28–AWL–

14 to within 120 months since the date 

of issuance of the original standard 

airworthiness certificate or the date of 

issuance of the original export 

certificate of airworthiness. 


pwalker on PROD1PC71 with RULES