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# © U.S . Departmsn t o f Transportatio n Fdddra l Aviatio n Admlnlitrafio n 

### DrPTOFIBANSPOBWIO N nDCK!:i S Smal l Airplan e Directorat e 90 1 Locus t Kansa s City , M O 6410 6

.n'.-. f

Mr , Robert

Kxemniteer Chief , Offic e o f

Airworthines s Diamon d Aircraf

t Industries , Gmb H N.A . Otto-Strass e 5 A'270 0 Wiene r

Neustad t Austri a Dea r Mr . Krenmitzer : W e ar e enclosin g agiran

t o f you r petitio n submitte d o n Septembe r 23 , 2009 , requestin g a

n exemptio n fi'om. th e requiremait s o f 1 4 CFRpar t

23 , § § 23.1419(a) . Th e exemptio n allow s Diamon d t o obtai n atyp e certificat e o n th e Diamon d Mode l D A 4 2 N G airplane s with a landin g configuratio n stal l spee d in icin g condition s tha t exceed s 6 1 knots . I f

yo u hav e an y questions , pleas e contac t

Mr . Pau l Pellican o a

t th e abov e addres s o r

cal l hi mo n 770-703

- 6064 . Sin e J ^ Ki mSmit

h Manager , Smal l Airplan e Directorat e Aircraf t Certificatio n Servic e .Enclosur etjj/zcr//uiK ) iz:z r Dibaz^iiti b S H U rHo t a^ / ei 3

Exemptio n No . 1003 6 UNITE D STATE S O F AMERIC A DEPARTMEN T O F TRANSPORTATIO N FEDERA L AVIATIO N ADMINISTRATIO N KANSA S CITY , M O 6410 6

I n th e matte r

o f th e petitio n o f DIAMON D AIRCRAF T INDUSTRIE S GmbH , (DIAMON D AIRCRAFT ) fo r a n exemptio n fro m§ 23.1419(a ) o f Titl e 14 , Cod e o f Federa l Regulation s Regulator y Docke t No . FAA-2010-008 S

GRAN T O F EXEMPTIO N B y letter date d Septembe r

23 , 2009 , Mr . Rober

t Kreminitzer , Chief

, Offic e o f Airworthiness , Diamon d Aircraf t Industrie s GmbH , (Diamon d Aircra,ft) , N,A . Otto-Strass e 5 , A-270 0 Weiner-Neustadt , Austria , petitione d th e Federa l Aviatio n Administratio n (FAA ) o n behal f o f Diamon d Aircraf

t fo r a n exemptio n firom§ 23.1419(a ) o f Title 14 , Cod e o f

Federal Regulation s (1 4 CFR) . Th e propose d exemption , i f granted , woul d allo w astal l spee d abov e 6 1 knot s i n th e landin g configuratio n (Vso) . i n icin g condition s fo r th e mode l DA-4 2 N G aircraft , Vs o means th e stallin g spee d o r th e minimu mstead y flight spee d obtaine d i n a specifi c configuration , a s define d in 1 4 CFR part 1 , § 1.2 . Th e petitione r

request s relie f

fro mth e followin g regulation : Sectio n 23,1419(a ) prescribe s tha t airplan e performance , controllability , maneuverability , an d stability mus t no t b e les s than that

require d i n par t

23 , subpar

t B , i n th e icin g condition s define d i n part 25 , Appendi x C . Sectio n 23.4 9 i s include d i n subpar t B performance , an d § 23.49(c)(2 ) require s Vs o to b e 6 1 knot s o r les s fo r th e Diamon d Aircraf

t mode l DA-42 . Th e petitione r

support s it s reques t

wit h th e followin g information : Th e petitione r

state s tha t compensatin g feature s i n suppor t o f th e requeste d exemptio n are liste d i n FA A Advisor y Circula r (AC ) 23.1419-2D , paragrap h 13,a.(l)(c) , Som e o f th e compensatin g feature s includ e th e following :KJj/.iD/ze)iK ) iz:z roio^sz'SHiKi D 3P, u rHiJ t atH ' ei o

1 . Th e airplane wit

h no ic e accretion s meet s th e 6 1 knot stal l speed requiremen

t o f § 23.49(c) , 2 , Th e airplane wit

h critica l ic e accretion s (a s define

d i n paragraph 13b o f

A C 23.1419

- 2D ) complie s wit

h the stall wan:iin

g requiremen

t o f § 23.207 . The model DA-4 2 N G forwar d cente r o f gravit y limi t wa s revised t

o compl y wit h thi s requirement . 3 , Th e Airplane Fligh

t Manua l performanc e dat

ain icin g condition s reflect s the highe r stall an d operatin g speeds , 4 . Th e airplane wit

h critica l ic e accretion s ha s acceptable stal l characteristic s an d i s safel y controllabl e wit

h norma l pilotin g skills . Th e petitione r state s granting th e exemption woul d benefi t the publi c b y increasing the utilit y o f a n airplane tha

t incorporate s ne

w technologie s whic

h enhanc e safety , suc

h a s avionic s tha

t increas e situationa

l awareness . Th

e utilit y o f th e airplan e i

n icin g would b e reduced if th e exemptio n wer

e not granted becaus e th e weigh

t of th e airplane , an

d therefor e th e payload , would b e reduced . Th e petitione r state s safet

y i s not adversel y affecte d becaus e th e mode

l DA-4 2 ha s al

l the compensating feature s liste d i n th e AC . Th e Diamon d Aircraf t DA-4 2 N G i s aderivativ e o

f th e Diamond Aircraf

t DA-42 . A simila r exemption reques t

wa s granted fo

r th e Diamon d Aircraf t DA-4 2 (Exemptio n No . 9623 ) i n 2008 . A summar

y o f th e DA-4 2 exemption petitio n wa s publishe d i n th e FEDERA

L REGISTE R o n Septembe

r 6,200 6 (7 1 F

R 52609) . A simila

r exemptio n reques t

wa s granted fo r the Cirru s Design Corporatio n SR2 2 (Exemption No . 9849 ) i n 2009 . A summar y o f th e SR22 exemption petitio n wa s published i n th e FEDERA

L REGISTE

R on Februar

y 17 , 2009 (7 4 F R 7534) . N o comments wer e received fo

r eithe r exemption request . A

n Equivalen

t Leve l o f Safet y (ELOS ) (No . ACE-02-10 ) wa s granted t o th e Extr a40 0 i n 200 2 prior to the FA A positio n tha

t a n exemption , not

a n ELOS , i s appropriate . Sinc e th e exemption reques t on the model DA-4 2 NG i s th e sam e a s previou s requests , an

d th e model DA-4 2 N G incorporate s th e compensating feature s listed i n Advisor y Circula r 23.1410-2D , an

d granting th e DA-42 N

G petitio n doe s no t

se t aprecedent , we determined tha t w e should no t

dela y action o n i t b y republishin g i

t fo r publi c comment . Th e FAA' s analysi s i s a s follows : Th e FA A finds tha

t the model DA-4 2 NG , as modifie d b y th e typ e desig

n chang e define d b y FA A projec t TD0326CE-A , incorporate s th e compensating feature s liste d i n Advisor y Circula r 23.1419-2D , paragrap

h 13.a.(l)(c) .

iiMl iUJ/'/D/zK)it ) iz:z rDibJz^uiia D aH U rwi^c . tra/a o

Th e FAA' s Decision I n consideration o

f th e foregoing , I find tha

t agran t o f exemption i s in th e publi c interest . Therefore , pursuan t t o th e authorit

y contained in 4 9 U.S.C . § § 4011 3 an d 44701 , delegated t o m e by the Administrator , Diamon d Aircraf t Industrie s Gmb

H i s granted a

n exemption fi-o

m1 4 CF R § 23.1419(a

) t o the exten t necessar y t o allow certification o f

th e ic e protectio n syste

mo n th e mode

l DA-42 NG , subjec

t t o the condition s an

d limitation s liste d below . Condition s an d Limitation s 1 , Production model DA-4 2 N G airplanes , prio

r t o being approved fo

r flight i n icing conditions , must

b e demonstrated t

o hav e aminimu

mstall warning margi

n o f 1 0 knot s indicated airspeed , wit

h n o ice , an d n o nuisanc e stall warning durin g norma l operation s a s describe d i

n Diamon d Aircraf t mode l DA-42 N G /M-NG production tes t car d fo r "4. ) Stall ^ Test, " Form

#IG.001DA42 N

G /M-NG , Chapte

r 4 , Revision 4 , pag e 5 o f 8 . Issue d in Kansas City , M

O o n Marc h 23 , 2010 . 

# hj> ^ Stev e Thompso n Actin g Manager , Smal l Airplan e Directorat e Aircraf t Certificatio n Servic e

MH H