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14 CFR Part 39

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

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[Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-078-AD]

RlN 2120-AA64

Airworthiness Directives; Hawker Beechcraft Corporation (Type Certificate Previous

Held by Raytheon Aircraft Company; Beech Aircraft Corporation) Model400A and

400T Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mo

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400A. and 400T airplanes. This proposed AD would require a detailed inspection for

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proper sealant of the left and right pylon firewall structures, and corrective actions if

necessary. This proposed AD results from reports of missing sealant on the left and rig1

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• Fax: 202-493-2251.

instructions for submitting comments.

• Federal eRulemaking Portal: Go to http://v....\vw.regulations.gov. Follow the

ADDRESSES: You may send comments by allYof the following methods:

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

fuselage, and a subsequent uncontrolled fire in the aft fuselage.

result in flames penetrating the seams in the firewall between the engine and the aft

on the left and right pylon firewall structures, which, in the event of an engine fire, cou

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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pylon firewall structures. We are proposing this AD to detect and correct missing sealaJ
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RIN 2120-AA64

IDocket No. FAA-2010-++++j Directorate Identifier 20IO-NM-078-ADI

14eFR Part 39

Fedcl"al Aviation Administration

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DEPARTMENT OF TRANSPORTA nON

Held by Raytheon Aircraft Company; Beech Aircraft Corporation) Model 400A and

400'1' Airplanes

AGENCY: Federal Aviation Adll1inistnHion (FAA), DOT.

ACTION: Notice of proposed ruJemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mo

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qt'"A~'EWG~ 400A, and 4001' airplanes. This proposed AD would require a detailed inspection for I

proper sealant of the left and right pylon firewall structures, and correclive actions if "~%r:;l

ncx:cssary. This proposed AD results from reports of missing sealant on the left and flgi t~ S- to I

pylon firewall structures. We are proposing this AD 10 detect and correct missing scala

all the left and right pylon firewall structures, which, inlhe event of an engine fire, Call

result in flames penetrating the seams in the firewall between the engine and the aft

fuselage, and a subsequent uncontrolled fire in the aft fuselage.

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

DA YS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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

• Federal eRulemaking Porlal: Go 10 http://w,V\v.regulations.!!ov. Follow the

inSlructions for $ubl11ining comments .

• Fax: 202-493~2251.

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