1 of 3

U.S. Department of Transport Field Aviation Company Inc. Docket Operations 2450 Derry Road East West Building Ground Floor Mississauga, Ontario Room W1 2 - 140 Canada L5S 1B2 1200 New Jersey Avenue, SE Wa shington, DC 20590 United States of America Subject, Petition for Exemption to FAR 25.981 (a)(3) Amendment 25 - 125 of

Title 14 , Code of Federal Regulations

. Dear Certification Official Exemption Specifics and Extent of Relief Field Aviation , in this case the peti tioner , wishes to apply for an exemption to FAR 25.981(a)(3) at Amendment 25 - 125 (Fuel Tank Explosion Prevention)

. Reason for Relief Wehave applied for a U.S. STC via the Canad a U.S. Bi - lateral Airworthiness Agreement , U.S.Project ref. ST7041NY-T , to enable the installation s of auxiliary fuel tank system s applicable to the Bombardier DHC - 8 - 100, 200 and 300 legacy series of aircraft. Weare unable to fully comply with the requirements set forth within section ( a) (3) and stipulate from our pers pective that further means of compliance is impractical due to the fact that our auxiliary fuel tank installation is an aftermarket design that is incorporated within existing OEM aircraft wing structure. Public Benefit Public benefit is shown by the extent our design is compliant with the regulation. Wi th respect to Fuel Tank Ligh t ning , HIRF Protection and Component Failures , Field Aviation has incorporated within our installation design , to the maximum extent practical , three levels of highly rel iable, independent and redundant protective features to prevent sources of ignition

. Field Aviation Company Inc. 2450 Derry Road East, Hangar 2 Mississauga, Ontario, Canada L5S 1B2 Phone: + 1 905 676 1540 Fax: +1 905 676 0977 www.fieldav.com2 of 3

In addition, Field Aviation has incorporated within our Instructions for Continued Airworthiness routine interval inspection criteria to support the continued functio nality of protective features. Exemption - Effect on Safety Field Aviation’s position is that the issuance of the exemption will result in no negative effect on safety. This is due to the quality of tank design and installation with respect to safety mitigation. Environmental exposure and fail ure protection measures coupled with routine interval inspection requirements facilitate , in our opinion , a level of equivalent safety. The Auxiliary Fuel Tanks are “ substantiated to be conventional unheated aluminum wing tanks ”

. p er AC25.981 - 1C Additional Information Field Aviation’s proprietary compliance report (25370105) is included with this petition for exemption. Contained within the report are the following elements; Statements of Compliance

– FAR 25.981 Amendment 25 - 125 Heat Transfer Analysis Safety Assessment of Auxiliary Fuel System Fault Tree Diagram Summary Exemption Applicability Field Aviation is specifically seeking relief from FAR 25.981(a)(3) at Amendment 25 - 125 as it applies to the Bombardier 100/200/300 series aircraft

. Description of Exemption Full compliance with the requirements set forth within section (a) (3) is not feasible , and we stipulate from our perspective that further means of compliance is also impractical due to the fact that our auxiliary fuel tank installation is an aftermarket design that is incorporated within existing OEM aircraft wing structure.3 of 3

Contact Information Wayne T. Sprigg Director of DAO and Flight Test Field Aviation Company Inc. Telephone 905 - 676 - 1540 Ext 264 Should clarification with respect to the contents of this petition be required please contact the undersigned directly. Sincerely

Wayne T. Sprigg Doc FAA Exemption Petition

– 25.981 ( a)(3)