[4910-13-P]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0609; Directorate Identifier 2009-NM-037-AD; Amendmen

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39_l"****j AD  -** -**]

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Airworthiness Directives; Bombardier Model DHC-8-1 02, DHC-8-103, DHC-8-1 06,

DHC-8-201, and DHC-8-202 Series Airplanes

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

(DOT).

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ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for the products liste

above. This AD results from mandatory continuing airworthiness information (MeAl)

originated by an aviation authority of another country to identify and correct an unsafe

condition on an aviation product. The MeAl describes the unsafe condition as:

During a puncture voltage test of the aluminum-loaded paint on an

in-service DHC-8 aircraft, conducted to validate an SFAR 88 [Special

Fecl.eralAviation Regulation No. 88] related task, Bombardier Aerospace

(BA) discovered that the top wing fuel tank skin between Ywl71.20 and

Yw26l.00 was painted with a non-aluminized enamel coating * * *.

With this type of paint application, it is possible that, in the worst case

scenario, a lightning strike could puncture the wing skin and create an

ignition source in the fuel tank.

Ignition sources inside fuel tanks, in combination with flammable fuel vapors, could

result in fuel tank explosions and consequent loss of the airplane. We are issuing this A

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DEPARTME;NT OF l'AANSPORTATION

39~*****;· AD  :..** -**)

Feder·al Avi~tion AdmiiJistration

14CFR Part39 .

IDocketNo~ FAA-i009-06b9; Directorate Jilentifier·2009~NM-037,,:AD; AmendJJle'nt,

RIN 212Q,AA64

Airworthiness D'irectivcs.; Bombardier Model DHe-8-10.2, DHC:~8-:103, D~CtS~ J 06;

DHC-8-201, and bHC-8~202$crics'Airplanes

AGENCY:

, Federal" Aviation .Administration . . ,

(FAA), Departiu'cnt ofTranspor.t~tjon ,

ACTlON:, Fina! ruie.

(DOT).

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. .• .. '. ,.. . . _ '" ' . '. ""U""M,""i7riijl SUMMARY: y.,'eare ndopt:l.l}ga neW uJrWOl'tlllncss directive (AD) fo,rthe products. lIsted ANE-170

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above. This AQ results'fr~in~ mandat?ry conth!uing aiiworthJi10.SSinformation (M8AI)

origimi.ted by an aviation -authbrity'of-apoth~r cou,ntry to ide~tify and corrett an unsafe

condition on an aviatjon 'p'fp-duct. Th_eMeAl describes-the:"uI1safe condition as:

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During a pUIlCtllre-:voJ.tage fe~t oqhe alumjnum~l.oaAt.d'paj\1t. 9ll,'an ,

in-serVice ~ flC':$ .~rcr~ft, C?Q.auc.~~~:i~rv~li d,at~,'a~"'~FARJ8rS'p~ci?t

Federa.l:A viall,on Re$u!atimi~N 6; ~8l'l:el~tedt~sk>:B0ID.Qardiet' ~erdsp~i:e

(BA) discovered'th:aUthe tojJ..wlng fhel t'~k'.skln.betweeil Yw 171.,20:'imd

yw261.90was paihi~~~iitba,non-aiumiiJ.izeq: ~namelcOiltiu&*" "'-.

With this type.ofpaint'application, it is,possible that, in:the vml's~__case

scenario, a lightning. strike could puncture (he wing skin and create an

ignition sourceirl't'ile' fueHai~k. ' ",

Ignition sources inside fuel tanks, in combination with flamrn:able fuel v:a~qr~. cOllld

result in fuel tank explasi(:ms and conseqllent loss of the airpl.anc. We are issuing ,tl1is AD Phm