05/25/2010 15:10 816329410& SAD PAGE 02/04 

O rv,r,r„. ^ ,,,s^ ^ Small Airplane Directorate 

\ j & i C r 1' , > T'RTATIOM 901 Locust 

Kansas Cfty, MO 64106 

U.S. Department ' >' 

of Transportation 

Federal Aviation i' . it- j o 

MAY 2 5 2010 

Mr. Rich Adler 

Director of Engineering 

Wipaire, Incorporated 

1700 Henry Avenue, Fleming Field 

South St. Paul, MN 55075 

Dear Mr. Adler: 

We are enclosing a grant of your petition submitted on May 4,2010, requesting exemption 

from the requirements of § 23.177(b) of Title 14 of the Code of Federal Regulations. The 

exemption allows Wipaire, Incorporated to install the Wipaire model 7000 amphibian floats 

on the Quest Aircraft Design, LLC. model 100 "Kodiac" aircraft without meeting lateral 

stability requirements. If you have any questionSj please contact Mr. J. Lowell Foster at the 

above address or call him on 816-329-4125, 

Sincerely, 

fi=^ im Smith 

Manager, Small Airplane Directorate 

Aircraft Certification Service 

Enclosure 
05/25/2010 15:10 8163294106 SAD PAGE 03/04 

Q 

U.S. Department 

of Transportation 

Federal Aviation 

Administration 

Small Airplane Directorate 

901 Locust Street 

Kansas City, Missouri 64106 

Exemption No. 10068 

Regulatory Docket No. FAA-2010-0495 

May 25,2010 

Mr. Rich Adler 

Director of Engineering 

Wipaire, Incorporated 

1700 Henry Avenue, Fleming Field 

South St. Paul, MN 55075 

Dear Mr. Adler: 

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

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

including the date it ends. 

The Basis for Our Decision 

By letter dated May 4,2010, you petitioned the Federal Aviation Administration (FAA) on 

behalf of Wipaire, Incorporated (Wipaire) for an exemption from § 23.177(b) of Title 14, 

Code of Federal Regulations (14 CFR) to the extent necessary to allow Wipaire to install the 

Wipaire model 7000 amphibian floats on the Quest Aircraft Design, LLC, model 100 

"Kodiac" aircraft without meeting lateral stability requirements. 

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 tltis petition would be detrimental to Wipaire. 

The FAA has previously granted relief in a circumstance similar to those presented in your 

petition. In these circumstances, the FAA found that for the airplane in question, the gradual 

divergence was acceptable because of the unique nature of the airplane and its operations. In 

the case of the Kodiak, 

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(1) the weak to slightly unstable lateral stability margins of the modified aircraft do not 

preclude continued safe flight and landing. Compliance with § 23.147(c) was 

determined during flight test with the roll controls free, reduced operational margins, 

and the installation and use of the emergency aileron trim timer override system 

(ETTOS), 

(2) the weakly divergent lateral stability of the modified aircraft in certain configurations is 

not detrimental to normal operations and, 

(3) the modified aircraft meets the original intent of § 23.177(b), in the "get-home" 

emergency configuration following loss of primary roll control 

The Kodiak airplane incorporates the emergency aileron trim timer override system (ETTOS), 

which will be installed as part of the float installation approval. The ETTOS allows 

continuous operation of the aileron trim system in an emergency configuration. 

Having reviewed your reasons for requesting an exemption, I find that— 

• the reasons stated by the FAA for granting the previous relief also apply to the situation 

you present; and 

• a grant of exemption is in the public interest. 

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 Wipaire, Incorporated an exemption from § 23.177(b) 

subject to the conditions and limits described below. 

Conditions and Limitations 

Wipaire, Inc. model 7000 amphibian floats on Quest Aircraft Design, LLC model 100 

"Kodiak" aircraft is exempt from meeting the static lateral stability requirement of § 23.177(b) 

-provided the aircraft is equipped with the Wipaire Emergency Trim Timer Override System 

(ETTOS). The ETTOS system provides a level of safety at least equal to that provided by 

§ 23.177(b). 

Sincerely, 

John Colomy 

Acting Manager, Small Airplane Directorate 

Aircraft Certification Service