14 CFR Part 39

(4910-13-V]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

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(Docket No. FAA.-2009-+++++; Directorate Identifier 2009-NM-153-ADj

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Amendment 39-**; AD 2008-10-06 Rl J ·r

RIN 2120-AA64

Ainvorthiness Directives; Boeing Model 747-400, -400D, and -400F Series Airplanes

AGENCY: Federal Aviation Administration (FAA). Department ofTransportatioll

(DOT).

ACTION: Final rule; request for comments.

SUMMARY: The FAA is revising an existing airworthiness directive (AD), which

applies to cCltain Boeing Model 747-400, -400D, and -400F series airplanes. That AD

currently requires revising the FAA-approved maintenance program by incorporating

new airvvorthiness limitations (AWLs) for fuel tank systems to satisfy Special Federal

components. Thjs 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.

OATES: This AD is effective [insert date 15 days after date of publication in the

FEDERAL REGTSTER].

On June 12, 2008 (73 fR 25990, May 8, 2008), the Director of the Federal

Register approved the incorporation by reference of a certain publication listed in the A

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(4910-13-U)

DEPARTMENT m- TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

IDocket No. FAA-1009-+++++; Directorate Identifier 2009-NM-153-Allj

Amendment 39_*"; AD 2UU8-1O-06 Rl(

RlN 212U-AA64

Ain,'orthincss Directives; Boeing ModeJ 747-400. -4000, and -400F Series Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of TranspoJ1atiol1

(DOT).

ACTION: final rule; request for comments.

SUMMARY: The FAA is revising an existing airworthiness directive (AD). which

applies to certain Boeing ModeJ 747-400, -4000, and -400F series airplanes. That AD

currently requires revising the FAA-approved maintenance program by incorporating

new air\vorlhincss limitations (AWLs) for hlel tank systems to satisfy Special Federal

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Aviatian Regulation No. 88 requirements. That AD also requires the initial inspection 0

certain repetitive AWL inspections to phase in those inspections, and repair if necessary Ir<rJ1Al$/SIt;

This AD clarifies the intended effect of the AD on spare and on-airplane fuel tank SystCI ATE

components. 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

nammablc fuel vapors, could result in a fuel tank explosion and consequeI1lloss of the

airplane.

DATES: This AD is effective [insert date 15 days after date of publication in the

FEDERAL REGISTER].

On June 12, 2008 (73 FR 25990, May 8, 2008), the Director of the Federal

Register approved the incorporation by reference of a certain publication listed in the A

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