14CFR Part 39

[4910-I3-UI

DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration

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IDocket No. FAA-20~-1 I I I i j Directorate Identifier 2009-NM-OIO-AD) I- ) IL

RIN 2120-AA64

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Airworthiness Directives; Saab AB, Saab Aerosystems Model SAAB 340A

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

date of publication in the FEDERAL REGISTER].

DATES: We must receive comments on this proposed AD by [insert date 30 days after

• Federal eRulemaking Ponal: Go to http://www.reQulations.Q.ov. Follow the

found on two additional airplanes, and extensive corrosion was found on one airplane.

behind the external adapter plate of the antennae during inspection. Similar cracking was

external adapter plate oftbe antennae of certain safe-life structure. which could result in

reduced structural integrity and consequent rapid depressurization of the airplane.

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

340B airplanes. This proposed AD would require inspecting the fuselage surface for

corrosion and cracking behind the external adapter plate of the antennae installation, and

We are proposing this AD to detect and correct corrosion and cracking behind the

corrective actions if necessary. This proposed AD results from a report ofa crack found

Type Certificate (STC) SA00244WI-D. STOOI46WI-D, or SA984GL-D

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for

certain Saab AB, Saab Aerosystems Model SAAR 340A (SAAB/SF340A) and SAAB

(SAAB/SF340A) and SAAB 340B Airplanes modified in accordance with SupplementaJ

(DOT).
IHIO-IJ-UI

OEl'ARBIE"T OFTRA1'ISPORTATIO."

Fcdcnl! A\"iation Administration

IDocket No. 1".>\;\-2009-1 . I I ': Directorate Identifier 2009-NlVi-tHO...An]

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RIN 2121)-;\.,-\.64 / I·

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\in\'orthUIC"S Dircctivcs; Saab AS. Saab Acrosystcms Model SAAB 340A A E:G

(SAAB SF}40A) and SAAB 3-408 Airplanes modified in accordance \\'ilh Supplcm~ntal

-[ ypt: Certificate- (STC) STOO224WI-D. STOOJ46WI-D. or SA984GL-D

AGENCY: Federnl Aviation Admini"ir:nion (FAA), Department ofTrunsportiltlon

(DOT).

ACTION: MotH':Cof proposed rulcmaking (NPRrvl).

Sl\:\l :'\'lAR\-: TIll,,' FAA proposes to adapr a new ainvorthlness dir~c[ivc (AD) ji:'1r

certain S•.13h AS. Saal':>Aerosystems !\'!odcl SA.A.B 3-+0A (SAAB/SF340A) and SA-\ll

UnB ,mplane-;. This pmpmed AD would require inspecting ihe fuselage surface for

l.:\IITI':.h1n or cr<ll.:king behind Ihe cxt~mal adapter plate of the amennae instnlbrion. ilnd

t:orn'::l.:liveactions ifneces<;ary. This proposed AD results from a rep()t1 ofa crack found

hehind the external adapter plate oflhc antennae d,lring inspection. Sirnilnr cracking was

fnunct on twu additional airplanes. lIlld extensive COITosiofi Ivas found on (Inl.:: airplane.

We al\~propo,(;ing lhi$ AD to detect and corrtJ(.;"tcorrosion or cracking behimlthe extemul

~Japler plurc l,r ihe antennae of certain safe-life StruC!llre. which could result in reduced

:.trucrur:1t integrity and con~eqlleIll rapid deprt:Ssurizalion of the airplane. ---

DATES: Vie muS1 receive commenlS on this proposed AD by (insert dale 30 day:- a.Her

daICofpublic31ion in the FEDERAL REGISTER].

Al)lJRESSE$: Y\1U may send eomm<.:nts by any of the following 1l1cth\)ds:

" Fedt:r<ll c:Rulcmaking. J1orlill: (it) to h!tp://www.rcswlatiol1s.D.ov. FoJh)w lhc
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