### 14910-I3-P]

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14eFR 

### Part 39 

## ,o-ODL{) [DocketNo. FAA-2~-1 IIII; Directorate Identifier 2009-NM-128-AD} RIN 2120-AA64 Airworthiness Directives; McDonnell Douglas Corporation Model DC-l O~ 10. DC-IO-IOF, and MD-I O-IOFAirplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulcmaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain McDonnell Douglas Model DC-I 0-10, DC-IO-IOF, and MD-IO-IOF airplanes. This proposed AD would require aone-time high frequency eddy current inspection of fastener holes for cracks atthe left and right side wing rear spar lower cap at station Xors=345, and other specified and corrective actions as necessary. This proposed AD results from areport ofthree instances ofModel DC-1O-1OFairplanes having fuel leaks I 

## '!, ID >0() YMIlOL

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### in the wing rear spar lower cap at station Xors=345. We are proposing this AD to preve t cracks in the spar cap, which ifnol corrected could lead to cracking ofthe lower wing (Q1)1TNG SYMI",c

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### skin, fuel leaks, and the inability ofthe structure to sustain limit load. DATES: We must receive comments on this proposed.J\.[) by [insert date 45 days after IE 

### date ofpublication in the FEDERAL REGISTER]. ADDRESSES: You may send comments by 

### any ofthe following methods:

Q 

### Federal eRu1cmaking Portal: Go to http://v{\vw.regulations.gov.Followthe instructions for submitting comments.

• Fax: 202-493-2251. lATE

<IT"'" SYMBOl •[4910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

### I-tCFR Part 39 [Docket No. FAA-2009-+++++; Directorate Identifier 2009-NM-128-AD] RIN 2120-AA64 Airworthiness iJircctivcs; McDOImell Douglas Model DC-l0-10, DC-IO-lor. and l\1D-1 0-1 OF Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed ruJemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) 

### tor certain McDonne.1l Dougl<.ls Model DC-lO-] 0, DC- J0-1OF,and MD-IO-I OFairplanes. This proposed AD would require a one-time Ilighfrequency eddy current inspection of fastener holes for cracks at the left and right side wing rear spar lower cap at siation Xors=345, and other specified and corrective actions as necessary. This proposcJ AD result!;;from are-portof three instances ofmode! DC-l 0-101; airplanes having fuel leaks in the wing rear spar lower cap at station Xors=345. We are proposing this AD to prev<::nt cracks in the spar cap, which if not corrected could lead to cracking af the lov
... ·crwing skin, fud leaks, and the inability oftbe structure to sostainlimilload. DATES: We must receive commenLson this proposed AD by [insert date 45 days after date ofpublication in the FEDERAL REG1STERJ. AI)DRESSES: YOLl

may send commeniS by any ofthc following methods:

• Federal eRulemakin£ Portal: Go to http://w\\.\v.re£l1lations.gov. follow theinstructions for submitting commenlS.

'"Fax 202-493-225 J. 1'A;1),i -fltlt7 

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FAA Fann 1360-14.1 (6-89) OFFICIAL FILE COPY