08/22/2012 12:52 

U.S. Deportment 

of Tronsportatlon 

Federal Aviation 

. Administration 

8153294105 

August 22, 2012 

Mr. Carlos Ayala 

Manager of Airworthiness 

Cessn.a Aircraft Company 

One Cessna Boulevard 

Post Office Box 7704 

Wichita, KS 67277 

Dear Mr. Ayala: 

SAD 

Exemption. No. 10605 

Small Airplane Directorate 

901 Locust 

Kansas City, Missouri 641 OS 

Regulatory Docket No. FAA-2012-0822 

This letter is to inform you that we have granted your request for exemption. It tran.smits 

our decision, explains its basis, and gives you the conditions and limitations of the 

exemption. 

The Basis for Our Decision 

PAGE 02/07 

By letter dated July 27, 2012, you pctitio.ncd. the Federal Aviation Administration (FAA) on 

behalf of Cessna Aircraft Company (Cessna) for an. exemption from the§ 23.49(c) stall 

speed requirement of§ 23.1419(a) of Title 14, Code of Federal Regulatio.ns (14 CFR) to the 

extent necessary to allow Cessna to certify the model T240 Corvalis for flight in icing 

conditions. 

The FAA has determined that good cause exists for not publishing a summary of the petition 

in the FEDERAL REGISTER because the requested exemption would not set a precedent, 

and any delay in acting on this petition would be detrimental to Cessna. 

The FAA has issued grants of exemption in circumstances similar in all material respects to 

those presented in your petition. fu Grant of Exemption Nos. 9849 and 9623 (copies 

enclosed), the FAA found that other similar airplanes could not meet the 61 knot stall speed 

requirement in icing conditions, but safety is not adversely affected due to the compensating 

features listed in Advisory Circular 23.1419-20. 

Having reviewed your reasons for requesting an exemption, I fmd that-· 

• they are similar il1 all material respects to reliefpreviously requested in. the enclosed 

Grant of Exemption Numbers 9623 and 9849; 

• the reasons stated by the FAA for granting the enclosed Grant of Exemption Numbers 

9623 and 9849 also apply to the situation you present; and 

• a grant of exemption is in the public interest. 

ACE-12-482-E 
08/22/2012 12:52 8153294105 SAD PAGE 03/07 

2 

Our Decision 

Under the authority contained in 49 U.S.C. 40113 and 44701, which the FAA Administrator 

has delegated to me, I hereby grant Cessna Aircraft Company an exemption from 

14 CFR § 23 .1419( a) to the extent necessary to allow Cessna to certificate model T240 for 

flight in icing conditions, subject to the conditions and limits described below. 

Conditions and J ... imitations 

1. This exemption applies only to model T240 airplanes that conform to the Flight 

into Known Icing (FIKI) major type design change defined in FAA project 

TD5550WI-A 

2. This exemption only applies to the stall speed requirement ih 

14 CFR § 23.14l9(a). 

Si11cerely, 

Earl Lawrence 

Manager, Small Airplane Directorate 

Aircraft Certification Service 

2 Enclosures: 

Copy of Exemption Number 9623 

Copy of Exemption Number 9849 
08/22/2012 12:52 

Document Text Viewer 

UNITED STATES OF AMERICA 

DEPARTMENT OF TRANSPORTATION 

FEDERAL AVIATION ADM:NISTRATION 

I~NSAS CITY1 MO 64106 

In the matter of the petition df 

DIM~OND AIRCRAFT 

J.NDUSTRIES GmbH, 

SAD 

Exemption No. 9623 

(DIAMOND AIRCRAFT) Regulato:r.y Pocket No. FAA-2006-25568 

for an exemption from? 23.14J.9{a) 

of Title 14 1 Code of 

Federal Regulations 

GRANT OF EXEMPTION 

PAGE 04/07 

Page 1 of2 

By letter dated August 7, 2006; Mr. Manfred Reichel, Chier:, Ot;f;i.ce of 

Airworthiness, Diarnon.<:l ·Aircraft Indu.striis GmbH, (Diamond Aircraft), N.A. OttoStr.asse 5, A-2700 Weiner-Neustadt, Austria, petitioned the Federal Aviation 

Administration (FAA) on behaJ.;I; of Diamond Aj.rcrf.lft for an exemption from 

? 23.1419(a) of Title 14 1 Code of Federal Regulations {11 CFR). The p~oposed 

exemption, if granted, would allow a stall speed above 61 knots in the landing 

configuraUon (VSO), in .i.cing conditions. 

The petitioner reques·ts relief from the following regulation: · 

Section 23.1419(a) prescribes that airplane performance, controllability, 

man®uvera.bi.tity, o:;~nd stability :m.u.st not be J.es.s than that r.equi:r.ed j.n. pa;r.t 23, 

subpa:t:t B, in the icing conditions defined in part 25, Appendix C. Section 

23.49 is included in subpart B performance, and 23.49(c) requires VSO to be 61 

knots or less for the Diamond Aircraft model DA-42. 

The petitioner supports its request with the following information: 

The petitioner states that compensating featur.o:s in support of th.e ;r,equ.ested 

exemption are listed in FAA Adviso:r.y C;i.;r.cuJ.OS!.r (AC) 23. l419-2C. The guidance in 

the AC is written for single engine airplanes, however the petitioner states 

this guidance should also be applicable to multi-engine airplanes. the 

pet:l t;i.oner states granting the· exemption would benefit T.h.e public by increasing 

the utility of an airplane that incorporates new technologies which enhance· 

safety, such as avionics that inc:ce.ase s~.tuational awareness. The utility of 

the airplane in icing would be reduced if the exemption were not granted because. 

the weight of the airplane, and therefore:: the payloa.d, wou.l.d. be reduced. The 

petitioner states safety is not adversely affected because the model DA-42 has 

alJ. the compensating feature:s ~.:i.sted in the AC. 

Although the petitioner requested that action on its petition not be 

delayed for publication in the Federal Register, the FAA found that the: 

petition, if granted, would set a precedent. Therefore, to allow an opportunity 

for the public to comrn<::nt on the petition,·a summary of this petition was 

published in the Federal Register on September 6, 2006 (71 FR 52609). No 

comments were received. 

The F.AA' s analysis is as follows: 

The F~A finds that the model DA-42 incorporates the compensating fcatur10:s lis1:ed 

in Advisory Circular 23.1419. Howevert in order to assure the model DA-42. 

complies wi'th the 5 knot minimum margin of 14 CFR ? 23.207 (c), with c.d.tical ice 

accretionG, the stall warning margin on the airplane with no ice accretions must 

be abov~ 9 knots indicated airspeed. The stall warning m~rgin must be less than . 
08/22/2012 12:52 8153294105 SAD PAGE 05/07 

Document Text Viewer Page 2 of2 

12 knots indicated airspeed to comply with the maneuver n".a;r.gj.n requirements ~.n 

14 CFR? 23.207(d). 

The FAA's Decision 

In consideration of the foregoing, I find tha.t a. grant of exemption :i.s :i.n 

the public interest. Therefore, pursuant to the authority contained 

in 49 U.S.C. § 40113 and 44701, delegated to me by the Administrator, Diamond 

Ai:r.c;ca;r:t Industries GmbH is granted an exemption from J.4 CFR ? 23 .l4l9 (a.) to the 

extent necessary to allow Diamond Aircraft to certif.i.cate.the ice protection 

system on the model DA-42, su.bject to the conditions and limitations listed 

below. 

Conditions and Limitations 

J.. Production model DA-42 airplanes, p:r.ior. to being approved for flight in icing 

conditions, must be demonstrated to have a stall warning margin o.f: 9 to 12 knots 

indicated airspeed, with no ice, as described on either: 

a. Pages 18 and 20-22 of Work Instruction WI-OSB-42-0lS hice Protection System" 

in Diamond Aircraft Optional Service Bulletin OSB-42-015/3 (revision 3}, dated 

January 16, 2008. 

b. Diamond Aircraft model DA-42 p.r.odl.lctj,on test card for "4.) Stall - Test," 

Form# IG.001DA42 D, Chapter 3, Revision 11, page 5 of B. 

Issued in Kansas City, MO, on February 22, 2008. 

S/ 

Patrick R. Mullen, Acting Manager 

Small Airplane Directorate 

Aircraft Certification Service 

2 

ACE.-06-577-E 

ACE-06-577-E 
08/22/2012 12:52 8153294105 SAD 

Exemption No. 9849 

UNITED STATES OF AMERICA 

DEPARTMENT OF TRANSPORTATION 

FEDERAL AVIATION ADMINISTRATION 

KANSAS CITY, MO 64106 

In the 1:natter of the petition of 

CIRRUS DESIGN 

CORPORATION 

(CIRRUS DJi:SIGN) 

for an exemption from§ 23.1419(a) 

of Title 14, Code of 

F cderal Regulations 

Regulatory Docket No. FAA-2009~0040 

GRANT OF EXEMPTION 

By letter dated January 13, 2009, Mr. Christopher Mitchell, Director, Airworthiness, 

Cirrus Design Corporation (Cirrus Design), 4515 Taylor Circle, Duluth, Minnesota, 55811 

petitioned the Federal Aviation Administration (FAA) on behalf of Cirrus Design for an 

exemption from§ 23.1419(a) of Title 14, Code ofFedei:al Regulations (14 CFR). The 

proposed exemption, if granted~ would allow a stall speed a.bove 61. knots in the landing 

configuration (Vso), in icing conditions. · 

The petitioner requests relief from the following regulation: 

PAGE 05/07 

Section 23.1419(a) prescribes that airplane performance, controllability, 

maneuverability, and stability must not be less than that required in part 23, subpart B, in 

the icing conditions defined in part 25, Appendix C. Section 23.49 is included in 

subpart B perfonnance, and § 23 .49( c) requires V so to be 61 knots ot less for the Cirrus 

Design model SR22. 

The petitioner supports its request with the following information: 

The petitioner states that compensating features in support of the requested exemption 

are listed in FAA Advisory Circular (A C) 23.1419-20. The petitioner states that 

granting the exemption would benefit the public by increasing the safety of the airplane, 

· since the model SR22 is primarily used for cross-country travel an.d has a high 

probability of encountering inclement weather, including icing conditions. Granting the 
08/22/2012 12:52 . 8163294106 SAD PAGE 07/07 

exemption would allow the airplane to be certified for flight into known icing with a 

system that has increased redundancy and capability compared to the system currently 

certified. The utility of the airplane in icing would be reduced if the exemption were not 

granted because the payload would be reduced by approximately 302 pounds, or about 

30 percent. The petitioner states safety is not adversely affected because the model 

SR22 has all the compensating features listed in the AC. 

A similar exemption has been grrutted on. a multi-engine airplane, and this was the first 

exemption request for a single engine airplane. The FAA found that the petition, if granted, 

would set a precedent. Therefore,. to allow au opportunity for the public to con1ment on the 

petition, a summary of this petition was published in the Federal Register on Febtuary 17, 

2009 (74 FR 7534). No comments were received. 

The FAA's analysis is as follows: 

The FAA finds that the model SR22, as modified by the type design change defined by 

FAA project TD6406CH-A, incorporates the compensating features listed in Advisory 

Circular 23.1419-20, paragraph 13.a.(l)(c). 

The FAA's Decision 

In consideration of the foregojng, I find that a grant of exemption is in the public 

interest. Therefore, pursuant to the authority contained in 49 U.S.C. §§ 401 D and 44701, 

delegated to me by the Administrator, Cinus Design Corporation is ~anted an exemption. 

from 14 CFR § 23.14l9(a) to the extent necessary to allow Cirrus Design to certificate tbc ice 

protection system on the model SR22, subject to the conditions and limitations listed below. 

Conditions and Limitations 

This exemption applies only to model SR22 airplanes that confonn to the Flight into 

Known. Icing (FIKJ) major type design change defined in F A.A. project TD6406CH-A. 

Issued in Kansas City, MO on April 2, 2009. 

s/ 

JohnCotomy 

Acting Manager, Small Airplane Directorate 

Aircraft Certification Service 

2