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DEPARTMENT OF TRANSPORTATION

R1N 2120-AA64

14 CFR Part 39

Federal Aviation Administration

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[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 by Pratt and Whitney 4000 Series Engines or

General Electric CF6-80C2 Series Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

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require an inspection to determine the part number of the door and to detemline if the

ACTlON: Notice of proposed rulemaking (NPRM).

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

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mode DATE •

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747-2008, -300, -400, -400D, and -400F series airplanes. This proposed AD would ""115"'-

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pivot access door, and related investigative and corrective actions if necessary. This

proposed AD results from a report that the left and right spring beam mid-pivot bolt

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separation of a strut and engine from the airplane during flight.

position during strut modification. We are proposing this AD to detect and correct OUTINGS'(

incorrectly installed mid-pivot bolt assemblies on the spring beam on the outboard struts, ~-

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which could lead to fatigue cracking, which could lead to fracturing of the mid-pivot bolt ATE

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assembly, which could lead to loss of the spring beam load path and the subsequent C>'J11NGSY>I5OlAN"'"-I 0\

assembly access doors for the no. I strut were inadvertently installed in the incorrect

ADDRESSES: You may send comments by any of the following methods:

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

DATES: We must receive comments on this proposed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION rN THE FEDERAL REGISTER].

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[491O-13-P)

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR 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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AGENCY: Federal Aviation Administration (FAA), DOT.

correct mid-pivot access door is installed, and the installation of a marker on the midrequire an inspection to detel1Tlinethe part number of the door and to determine if the

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NJTIALS;SlG

ACTION: Nolice of proposed mlemaking (NPRM). 15,(I» ?r::rSUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mode DA~ '

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747-200B, -300, -400, -400D, and -400F series airplanes. This proposed AD would "",,5_

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pivot access door, and related investigative and corrective actions if necessary. This

proposed AD results from a report that the left and right spring beam mid-pivot bolt

assembly access doors for the no. I strut were inadvertently installed in the-incorrect

position during strut modification. We are proposing this AD to detect 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 of the mid-pivot bolt ATE' L

ID d (0 assembly, which could lead to loss of the spring beam load path and the subsequent

separation of a strut and engine from the airplane during flight.

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DATES: We must receive comments on this proposed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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ADDRESSES: You may send comments by any of the following methods:

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