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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2008-0107; Directorate Identifier 2007-NM-087-ADJ 

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.RIN 2120-AA64

and 747SP Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT 

### • -5-,;).I-ID Airworthiness Directives; The Boeing 

### Comp~yModel 747-100. 747-100B, 747-100B Rmlm"GSYMBo~N::I."

_ fbJf()-l~-lI\1t SUD, 747-200B, 747-200C, 747-200F. 747-300: 747-400, 747-400D, 747-400F, 747SR, 

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### ~ ••- 11' ACTION: Supplemental notice ofproposed rulemaking (NPRM); reopening ofcomme 

### ~~'S'GFo period. DATE SUM,MARY: We arerevising anearlier 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 inaffected lap and butt splices, wing-ta-body fairings locations, and external repair andcutout reinforceme areas; and related investigative and corrective actions ifnecessary. The original NPR1vI resulted from reports ofscribe lines found atlapjoints and buttjoints, around external doublers and antennas, and atlocations where external decals had been cut. This action 

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### " revises the original NPRM byrevising certain compliance times including reducing the compliance time for certain repetitive inspections. This supplemental NPRM also proposes to add inspections for certain airplanes. We areproposing this AD todetect an correct scribe lines, which can develop into fatigue cracks inJhe skin and cause sudden decompression ofthe airplane. DATES: We must receive comments on this supplemental NPRM by [INSERT DATE 25 DAYS AFTER DATE OFPUBLICATION INTHE FEDERAL REGISTER].DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration JNC'""RF:N~F.s OUTING $v>wo\ 14CFR Part 39 [Docket No. FAA-2008-0107; Directorate Identifier 2007-NM-087-ADJ 

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'" 5-~i-1D Airworthiness Directives; The Boeing 

### Company Mode1747-100, 747-100B, 747-100B OU'TlNG5YM60~N::1

. /11Jfn'I~-1Nt 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 ofproposed rulemaking (NPRM); reopening ofcomme period. SUMMARY: We arerevising anearlier 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 inaffected lap and butt splices, wing-ta-body fairings locations, and external repair and cutout reinforceme areas; and related investigative and corrective actions ifnecessary. The original NPRM resulted from reports of scribe lines found at lapj<?intsand buttjoints, around external doublers and antennas, and atlocations 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 '" I o 'IG SY l-



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# ::.:, h011", proposes to add inspections for certain airplanes. We areproposing this AD todetect an correct scribe lines, which can develop into fatigue cracks in:the skin and cause sudden decompression ofthe airplane. i; "lllJ\lS/SIG



### '" DATES: We must receive comments on this supplemental NPRM by [INSERT DATE OVT1NG SYMWL 25 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. NlTIALS/SIG