[4910-13-PJ

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0107; Directorate Identifier 2007-NM-087-ADJ

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and 747SP Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT

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Airworthiness Directives; The Boeing Comp~yModel 747-100. 747-100B, 747-100B Rmlm"GSYMBo~N::I."

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SUD, 747-200B, 747-200C, 747-200F. 747-300: 747-400, 747-400D, 747-400F, 747SR, '§: ~'''''A"

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ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comme ~~'S'GFo

period. DATE

SUM,MARY: We are revising an earlier proposed airworthiness directive (AD) for

certain Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C,

747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes .•

The original NPRM would have required inspections for scribe lines in affected lap and

butt splices, wing-ta-body fairings locations, and external repair and cutout reinforceme

areas; and related investigative and corrective actions if necessary. The original NPR1vI

resulted from reports of scribe lines found at lap joints and butt joints, around external

doublers and antennas, and at locations where external decals had been cut. This action ANvA.-\' L(

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revises the original NPRM by revising certain compliance times including reducing the

compliance time for certain repetitive inspections. This supplemental NPRM also

proposes to add inspections for certain airplanes. We are proposing this AD to detect an

correct scribe lines, which can develop into fatigue cracks in Jhe skin and cause sudden

decompression of the airplane.

DATES: We must receive comments on this supplemental NPRM by [INSERT DATE

25 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].
DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration JNC'""RF:N~F.s

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14 CFR Part 39

[Docket No. FAA-2008-0107; Directorate Identifier 2007-NM-087-ADJ

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Airworthiness Directives; The Boeing Company Mode1747-100, 747-100B, 747-100B OU'TlNG5YM60~N::1

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SUD, 747-200B. 747-200C, 747-200F, 747-300: 747-400, 747-400D, 747-400F, 747SR, 'J~'N.>'AN

and 747SP Series Airplanes ArE

. RlN 2120-AA64

AGENCY: Federal Aviation Administration (FAA), DOT

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comme

period.

SUMMARY: We are revising an earlier proposed airworthiness directive (AD) for

certain Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C,

747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes.

The original NPRM would have required inspections for scribe lines in affected lap and

butt splices, wing-ta-body fairings locations, and external repair and cutout reinforceme

areas; and related investigative and corrective actions if necessary. The original NPRM

resulted from reports of scribe lines found at lap j<?intsand butt joints, around external

doublers and antennas, and at locations where external decals had been cut. This action

revises the original NPRM by revising certain compliance times including reducing the

compliance time for certain repetitive inspections. This supplemental NPRM also

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proposes to add inspections for certain airplanes. We are proposing this AD to detect an

correct scribe lines, which can develop into fatigue cracks in:the skin and cause sudden

decompression of the airplane. i;

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DATES: We must receive comments on this supplemental NPRM by [INSERT DATE OVT1NG SYMWL

25 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. NlTIALS/SIG