01/14/2010 14:16 816329410& SAD PAGE 02/02 

^ •[••'••••^:"'^TAT:nM 

U.S. Department 

of Transportation 

Federal Aviation 

Administration 

Small Airplane Directorate 

901 Locust 

Kansas City, MO 64106 

JafttiaJty 14, 2010 . 

Mr. Christopher Mitchell 

Director, Airworthiness 

Cimis Design Corporation 

4515 Taylor Circle 

Duluth,MN 55811 

Dear Mr. Mitchell: 

We are enclosing a grant of your petition submitted on September 14, 2009, requesting 

exemption from the requirements of § 23.1419(a) of Title 14 of the Code of Federal 

Regulations, The exemption permits Cirrus to allow a speed above 61 knots in the landing 

configuration (Vso) in icing conditions for the model SR22T, If you have any questions, 

please contact Mr. Paul Pellicano at the above address or call him on 770-703-6064. 

Sincerely, 

Kir 

Manager, SiV»alM.irplane Directorate 

Aircraft Certification Service 

Enclosure 
01/14/2010 13:10 8163294106 SAD PAGE 02/04 

Exemption No. 9993 

UNITED STATES OF AMERICA 

DEPARTMENT OF TRANSPORTATION 

FEDERAL AVIATION ADMINISTRATION 

KANSAS CITY, MO 64106 

In the matter of the petition of 

CIRRUS DESIGN 

CORPORATION 

(CIRRUS DESIGN) 

for an exemption from § 23.1419(a) 

of Title 14, Code of 

Federal Regulations 

Regulatory Docket No. rAA-2009-1171 

GRANT OF EXEMPTION 

By letter dated September 14,2009, Mr. Christopher Mitchell, Director, Airworthiness 

and Engineering Services, Cirrus Design Corporation (Cirrus Design), 4515 Taylor Circle, 

Duluth, Mirmesota, 55811 petitioned the Federal Aviation Administration (FAA) on behalf of 

Cirrus Design for an exemption from § 23.1419(a) of Title 14, Code of Federal Regulations 

(14 CFR). The proposed exemption, if granted, would allow a stall speed above 61 knots in 

the landing configuration (Vgo), in icing conditions, Vso means the stalling speed or the 

minimum steady flight speed obtained in a specific configuration, as defined in 14 CFR part 1, 

§ 1.2. 

The petitioner requests relief from the following regulation: 

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 performance, and § 23.49(c) requires Vso to be 61 knots or less for the Cirrus 

Design model SR22T. 

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 (AC) 23.1419-2D, paragraph 13.a.(l)(c). Some of 

the compensating features include the following: 
01/14/2010 13:10 8163294106 SAD PAGE 03/04 

1. The airplane with no ice accretions meets the 61 knot stall speed requirement of 

§ 23.49(c). 

2. The airplane with critical ice accretions (as defined in paragraph 13b of AC 23.1419-

2D) complies with the stall warning requirement of § 23,207. 

3. The Airplane Fliglit Manual performance data in icing conditions reflects the higher 

stall and operating speeds. 

4. The airplane with critical ice accretions has acceptable stall characteristics and is 

safely controllable with normal piloting skills. 

The petitioner states that granting the exemption would benefit the public by increasing 

the safety of the airplane, siiice the model SR22T is primarily used for cross-countrytravel and has a high probability of encountering inclement weather, including icing 

conditions. Granting the 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 cuiTently 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 33 percent. The petitioner states safety is not adversely affected 

because the model SR22T has all the compensating features listed in the AC. 

The Cirrus SR22T is a derivative of the Cimis SR22. A similar exemption request was 

granted for the Cirrus SR22 (Exemption No. 9849) in 2009. A summary of the SR22 

exemption petition was published in the FEDERAL REGISTER on February 17, 2009 

(74 FR 7534). Also, the Diamond DA-42 was granted a similar exemption (Exemption No. 

9623) in 2006, No comments were received for either exemption request. An Equivalent 

Level of Safety (No. ACE-02-10) was granted to the Extra 400 in 2002 prior to the FAA 

position that an exemption, not an ELOS, is appropriate. Since the exemption request on the 

model SR22T is the same as previous requests, and the model SR22T incorporates the 

compensating features listed in Advisory Circular 23.1410-2D, and granting the SR22T 

petition did not set a precedent, we determined that we should not delay action on it by 

publishing it for public comment. Therefore, we waived the requirement for FEDERAL 

REGISTER publication. 

The FAA's analysis is as follows: 

The FAA finds that the model SR22T, as modified by the type design change defined by 

FAA project AT6893CH-A, incorporates the compensating features listed in Advisory 

Circular 23,1419-2D, paragraph 13.a.(l)(c). 
01/14/2010 13:10 8163294106 SAD PAGE 04/04 

The FAA's Decision 

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

interest. Therefore, pursuant to the authority contained in 49 U.S.C. §§ 40113 and 44701, 

delegated to me by the Admimstrator, Cirrus Design Corporation is granted an exemption 

from 14 CFR § 23.1419(a) to the extent necessary to allow Cirrus Design to certificate the ice 

protection system on the model SR22T, subject to the conditions and limitations listed below. 

Conditions and Limitations 

None. 

Issued in Kansas City, MO on January 13, 2010. 

Manager, Small Airplane Directorate 

Aircraft Certification Service