### 14CFR Part 39

[4910-I3-UI DEPARTMENT OF TRANSPORTA nON 

### Federal Aviation Administration

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### IDocketNo. FAA-20~-1 I I I i j 

### Directorate Identifier 2009-NM-OIO-AD) 

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### Airworthiness Directives; Saab AB, Saab Aerosystems Model SAAB 340A IM1 ,/ HUL,'IIN(i

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## '" ADDRESSES: You may send comments by any oftbe following methods: date ofpublication inthe 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 ofthe antennae during inspection. Similar cracking was external adapter plate oftbe antennae ofcertain safe-life structure. which could result in reduced structural integrity and consequent rapid depressurization ofthe airplane. AGENCY: Federal Aviation Administration (FAA), Department ofTransportation

340B airplanes. This proposed AD would require inspecting the fuselage surface for corrosion and cracking behind the external adapter plate ofthe antennae installation, and

We are proposing this AD to detect and correct corrosion and cracking behind the corrective actions ifnecessary. This proposed AD results from areport ofa crack found Type Certificate (STC) SA00244WI-D. STOOI46WI-D, or SA984GL-D
ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: The FAAproposes to adopt anew airworthiness directive (AD) for certain Saab AB, Saab Aerosystems Model SAAR 340A (SAAB/SF340A) and SAAB (SAAB/SF340A) and SAAB 340B Airplanes modified inaccordance with SupplementaJ (DOT).IHIO-IJ-UI 

### OEl'ARBIE"T OFTRA1'ISPORTATIO." Fcdcnl! A\"iation Administration 

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

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# /N~) ::1-~;;-.~J;::_<!. RIN 2121)-;\.,-\.64 / I· , 20 <'> I - , \in\'orthUIC"S Dircctivcs; Saab AS. Saab Acrosystcms Model SAAB 340A 

# AE: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•.

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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':.h1nor cr<ll.:king behind Ihecxt~mal adapter plate of the amennae instnlbrion. ilnd t:orn'::l.:live

actions ifneces<;ary. This proposed AD results from arep()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(.;"t corrosion or cracking behimlthe extemul ~Japler plurc 

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# --- :.trucrur:1t integrity and con~eqlleIll rapid deprt:Ssurizalion of the airplane. DATES: Vie muS1receive commenlS on this proposed AD by (insert dale 30 day:- a.Her daICofpublic31ion in the FEDERAL REGISTER]. Al)lJRESSE$: Y\1U may send eomm<.:ntsby any of the following 1l1cth\)ds:
" Fedt:r<ll c:Rulcmaking. J1orlill: (it) to h!tp://www.rcswlatiol1s.D.ov. FoJh)w lhcl,t-tlt'lal 'l.j:HiJlH \dmilli'dri:iinll ;.1 ( I j{ Pal'! 11) 

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