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DEPARTMENT Of TRANSI'ORTATION

Federal Aviation Administration

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14 CFR Par! 39

IDocket No. FAA-2009-+++++; Directorate Identifier 2009-NM-099-AD)

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Airworthjncss Directivesj Boeing Model 767 Airplanes

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

ACTION: Notice of proposed mlemakil1g (NPRrvt).

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SUMMARY: The FAA proposes to supersede an existing mrworthiness directive (AD) 1~);p'Gj

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that applies to all Boeing Model 767 airplanes. The existing AD currently requires . DArE/~"7k7'

repetitive detailed and high frequency eddy current (HFEC) inspections of the station R<rtI,fngSym"'"

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(STA) 1809.5 bulkhead for cracking, and corrective actions if necessary. This proposed INITIALS/SIG

AD \vould expand the inspection area to include the vertical inner chord at STA 1809.5

This proposed AD results from reported fatigue cracking in the vertical inner chord and

the forward outer chord while doing the detailed inspection of the horizontal inner chord

at STA 1809.5. We are proposing this AD to detect and correct fatigue cracking in the

bulkhead structure at STA 1809.5 and the vertical inner chord at STA 1809.5, which

o Federal eRulemaking Portal: Go to http://www.reguJations.l..!.ov. Follow the

could result in failure of the bulkhead structure for carrying the flight loads of the

horizontal stabilizer, and consequent loss of controllability of the airplane.

DATES: We must receive comments on this proposed AD by [iuse-I1date 45 days aner

instructions for submitting comments.

date of publication in the fEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:
14910-13-01

DEPARTMENT OF TRANSJ'ORTATION

Federal Aviation Administration

14 CFR Part 39

IDockct No. FAA-20M'-+++++; Directorate Identifier 2009-NM-099-ADI

RIN 2120-AA64

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~ NmA!.S/SIG .- AGENCY: Federal Aviation Administration (FAA), Department of Transportation

Airn'orthincss Directives; Boeing Model 767 Airplanes

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ACTION: Notice of proposed rulernaking (NPRM). 1ji;,t} ~. ~NGSJI"BOl

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SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) IN!nA!.Si~IG

that applies to all Boeing Model 767 airplanes. The existing AD CllHently requires

repetitive detailed and high frequency eddy cuneot (I-1FEC)inspections oftlle station

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CSTA) 1809.5 bulkhead for cracking, and conective ac1ions if necessary. This proposed lrJITlAt5jS1G

AD would expand the inspection area to include the Yeliica] inner chord at STA ] S09,5. :;E

This proposed AD results from reported fatigue cracking in the vertical inner chord and 2f:s::LD 5

the forward outer chord while doing the detailed inspection of the horizontal inner chor

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at STA 1809.5. We are proposing this AD to detect and correct fatigue cracking in the

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bulkhead structure at STA 1809.5 and the vertical ilU1erchord at STA 1809,5, which

could result in failure of the bulkhead structure lor carrying the night loads of the

horizontal stabilizer, and consequent loss of controllability of the airplane.

DATES: We must receive comments on this proposed AD by [insert' date 45 days ailer

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date of publication in tbe FEDERAL REGISTER].

ADDRESSES: You may send commen1s by any afthe following methods:

• Federal eRuJemaking Portal: Go 10 http://www.reu.ulations.u.ov. Follow the

instructions for submitting comments.

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