14910-I3-Pj

DEPARTMENT OF TRANSPORTATION

R1N 2120-AA64 14CFR Part 39 Federal Aviation Administration



# l\ \ \ [Docket No. FAA-2010-++++; Directorate Identifier 20tO-NM-129-AD]
Airworthiness Directives; The Boemg Company Model 747-2008, -300, -400, -400D, and -400F Series Airplanes Powered byPratt and Whitney 4000 Series Engines or General Electric CF6-80C2 Series Engines AGENCY: Federal Aviation Administration (FAA), DOT. 

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-;y- t" DATE require an inspection to determine the part number ofthe door and to detemline ifthe ACTlON: Notice ofproposed rulemaking (NPRM).

correct mid-pivot access door is installed, and the Installation of amarker on the midNlTIALSISIG 

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# 7i:r SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mode DATE • '2"1 2QI0 747-2008, -300, -400, -400D, and -400F series airplanes. This proposed AD would ""115"'- $"Il
-/lEG NlnALSlS1G pivot access door, and related investigative and corrective actions ifnecessary. This proposed AD results from areport that the left and right spring beam mid-pivot bolt 

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separation of astrut and engine from the airplane during flight. position during strut modification. We are proposing this AD todetect and correct OUTINGS'( incorrectly installed mid-pivot bolt assemblies on the spring beam on the outboard struts, ~- 

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# 10/-.'0'0 assembly, which could lead to loss ofthe spring beam load path and the subsequent C>'J11NGSY>I5Ol

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# 0\ assembly access doors forthe no. I strut were inadvertently installed inthe incorrect

ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go tohttp://www.regulations.gov. Follow the DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION rNTHE FEDERAL REGISTER].

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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-20lO-++++; Directorate Identifier 20JO-NM-129-AD] RIN 2120-AA64 Airworthiness Directives; The Boeing Company Madej 747-200B, -300, -400, -400D, and -400F Series Airplanes Powered by Pratt and Whitney 4000 Senes Engines or General Electric CF6-80C2 Series Engines

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# - ,4.v,I--/Cb'b AGENCY: Federal Aviation Administration (FAA), DOT.

correct mid-pivot access door is installed, and the installation ofamarker on the midrequire an inspection todetel1Tlinethe part number ofthe door and to determine ifthe , •••• SYHBOL

### flf' /¥vtlt,- i~ - NJTIALS;SlG ACTION: Nolice ofproposed mlemaking (NPRM). 

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# ?r::rSUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mode DA~ ' 

# ,~/r" ilJiG 747-200B, -300, -400, -400D, and -400F series airplanes. This proposed AD would "",,5_ 5U!-Au;. Im

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, pivot access door, and related investigative and corrective actions ifnecessary. This proposed AD results from areport that the leftand right spring beam mid-pivot bolt assembly access doors forthe no. I strut were inadvertently installed inthe-incorrect position during strut modification. We are proposing this AD todetect and correct incorrectly installed mid-pivot bolt assemblies on the spring beam on the outboard struts, 'Ol~- 

## \\4- which could lead to fatigue cracking, which could lead to fracturing ofthe mid-pivot bolt ATE' 

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# d (0 assembly, which could lead toloss ofthe spring beam loadpath andthe subsequent separation of a strut and engine from the airplane during flight. 0l1T1Al5,l51G DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. OUTING SYM60l ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the