Pursuant to subsection 5.9(2) of the Aeronautics Act, and after taking into account that the exemption is in the public interest and is not likely to affect aviation safety, I hereby exempt Kenn Borek Air Ltd. (hereinafter “KBA”), 290 McTavish Road N.E., Calgary, Alberta, Canada from the requirements set out in section 521.158 of the Canadian Aviation Regulations, with respect to section 3.606 of the Civil Air Regulations, Part 3, dated May 15, 1956, including amendments 3-1 to 3-8 inclusive and section 21 of the Special Conditions for the Type Certification of Multiengine Turbine Powered Aircraft, dated November 6, 1964, subject to the conditions set out in this exemption.
The requirements of the above provisions are detailed in Appendix A to this exemption.
In this exemption:
Icing Conditions – means visible moisture conditions when the appropriate static or total air temperature is near or below freezing.
PURPOSE
The purpose of this exemption is to permit the removal of the engine inlet deflector system on the Viking (formerly de Havilland Canada) DHC-6 “Twin Otter” Models 100, 200 and 300 aeroplanes and reissue the Supplemental Type Certificate (STC) SA09-62, originally issued through Exemption 072-2009. In particular, this exemption provides revised conditions as compared to exemption 072-2009: removal of the condition for the seaplane configuration; revising the condition for the minimum Outside Air Temperature (OAT), which is increased from +5°C to +10°C; and the addition of a condition requiring, prior to take-off for flight at night, the aircraft to be equipped with a functioning means of detecting visible moisture in flight.
APPLICATION
This exemption applies to KBA only for the reissuance of the supplemental type certificate #SA09-62 which approves the removal of the engine inlet deflector system on the Viking DHC-6 “Twin Otter” Models 100, 200 and 300 aeroplanes.
CONDITIONS
This exemption is subject to the following conditions:
Kenn Borek Air Ltd. shall record the following Limitations in the Viking DHC-6 “Twin Otter” Models 100, 200 and 300 Flight Manual:
- The aeroplane shall be limited to flight in Visual Meteorological Conditions (VMC);
- The aeroplane shall be limited to operations in Outside Air Temperatures (OAT) of +10°C or higher; (Note that this may limit the altitude of specific flights)
- The aeroplane shall not be flown into known or forecast icing conditions, or conditions of sand or dust;
- The aeroplane shall exit, at once, any conditions of inadvertent icing that are encountered; and
- For flight at night, prior to take-off, the aeroplane shall be equipped with a functioning means of detecting visible moisture in flight.
VALIDITY
This exemption shall be in effect until the earliest of:
- the date on which any condition set out in this exemption is breached; or
- the date on which this exemption is cancelled in writing by the Minister where he is of the opinion that it is no longer in the public interest or is likely to affect aviation safety.
DATED at Ottawa, Ontario, Canada this ___10___ day of ____August___2011____, on behalf of the Minister of Transport, Infrastructure and Communities.
<Original signed by>
David Turnbull
Director, National Aircraft Certification
Civil Aviation
Appendix A
REGULATORY REQUIREMENTS
CANADIAN AVIATION REGULATIONS
Part V - Airworthiness
Subpart 21 – Division IV – Changes to a Type Design
Section 521.158 – Standards of Airworthiness
521.158 (1) Subject to subsections (2) to (9), an applicant for the approval of a change to the type design of an aeronautical product shall demonstrate that the product meets the standards of airworthiness recorded in the type certificate data sheets and in force on the date of the application for the change.
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(3) A change to the type design of an aeronautical product may conform to an earlier amendment to a standard referred to in subsection (1) if the Minister determines that the change is not significant in the context of all previous relevant design changes and of all related amendments to the applicable standards recorded in the type certificate data sheets. …
UNITED STATES CIVIL AIR REGULATIONS
Part 3 – Airplane Airworthiness—Normal, Utility, Acrobatic and Restricted Purpose Categories
Subpart E – Power-plant Installations; Reciprocating Engine
Section 3.606 – Induction System De-Icing and Anti-Icing Provisions
§ 3.606 Induction system de-icing and anti-icing provisions. The engine air induction system shall incorporate means for the prevention and elimination of ice accumulations in accordance with the provisions in this section. It shall be demonstrated that compliance with the provisions outlined in the following paragraphs can be accomplished when the airplane is operating in air at a temperature of 30°F, when the air is free of visible moisture.
(a) Airplanes equipped with sea level engines employing conventional venturi carburetors shall be provided with a preheater capable of providing a heat rise of 90°F, when the engine is operating at 75 percent of its maximum continuous power.
(b) Airplanes equipped with altitude engines employing conventional venturi carburetors shall be provided with a preheater capable of providing a heat rise of 120°F, when the engine is operating at 75 percent of its maximum continuous power.
(c) Airplanes equipped with altitude engines employing carburetors which embody features tending to reduce the possibility of ice formation shall be provided with a preheater capable of providing a heat rise of 100°F, when the engine is operating at 60 percent of its maximum continuous power. However, the preheater need not provide a heat rise in excess of 40°F, if a fluid de-icing system complying with the provisions of §§ 3.607-3.609 is also installed.
SPECIAL CONDITIONS FOR THE TYPE CERTIFICATION
OF MULTIENGINE TURBINE POWERED AIRCRAFT
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21. CAR 3.606 – Engine Ice Protection. Turbine powered aircraft shall be capable of operation throughout the flight power range without accumulation of ice in the air induction system such as to adversely affect engine operation or cause a serious loss of power and/or thrust, under icing conditions defined in CAR 4b.1(b)(7) and (8).
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- Date de modification :