Pursuant to section 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 Bombardier Inc., 400 Cote-Vertu Road West, Dorval, Québec, Canada (BA) from the requirements set out in section 525.981(a)(3) of the Airworthiness Manual (AWM) subject to the following conditions.
The purpose of this exemption is to allow the Bombardier CL-600-2E25 aeroplane to be certificated without a complete showing of compliance with AWM 525.981(a)(3) at the time of certification. This standard requires demonstrating that an ignition source cannot be present in the fuel tank system and could not result from any single failure, any single failure in combination with any latent failure condition not shown to be extremely remote, and from all combinations of failures not shown to be extremely improbable. The structural aspects of the fuel tank systems must provide two independent means for lightning protection as practical as described in Issue Paper AV-1 (TCCA RDIMS No. 4793813). This exemption allows BA additional time to complete the necessary certification testing, mitigation, analysis, and documentation to show compliance with AWM 525.981(a)(3).
This exemption applies to the Bombardier CL-600-2E25 aeroplane and will be in effect in accordance with the conditions and the validity of this exemption.
CONDITIONSThe granting of this exemption is subject to BA complying with the following conditions by the specified dates:
BA must submit to the Minister on or before January 31, 2011 or any other date agreed to by the Minister before this date, a test plan and schedule, supporting the deliverables outlined in conditions 2 and 3 below.
BA will show compliance to AWM 525.981(a)(3) at Change 525-12, on or before October 29, 2012 or any other date agreed to by the Minister before this date, for the fuel tank system and its structure as documented in Issue Paper AV-1 dated June 26, 2009.
BA must develop and submit to the Minister for approval, on or before October 29, 2012 or any other date agreed to by the Minister before this date, Instructions for Continued Airworthiness in accordance with AWM 525.1529 at Change 525-12.
VALIDITYThis exemption is in effect until the earliest of the following:
the date on which any of the conditions set out in this exemption is breached;
The date on which this exemption is cancelled in writing by the Minister where he is of the opinion that the exemption is no longer in the public interest, or that it is likely to affect aviation safety; or
29 October, 2012, 23:59 EDT.
Dated at Ottawa, Ontario, Canada this 02 day of November 2010, on behalf of the Minister of Transport.
<<original signed by>>
Director, National Aircraft Certification
Attachment – Appendix A
AIRWORTHINESS MANUAL, SECTION 525
(at Change 525-12)
Section 525.981 – Fuel Tank Explosion Prevention
(a) No ignition source may be present at each point in the fuel tank or fuel tank system where catastrophic failure could occur due to ignition of fuel or vapours. This shall be demonstrated by:
(3) Demonstrating that an ignition source could not result from each single failure, from each single failure in combination with each latent failure condition not shown to be extremely remote, and from all combinations of failures not shown to be extremely improbable. The effects of manufacturing variability, aging, wear, corrosion, and likely damage shall be considered.
Transport Canada Issue Paper AV-1, “Lightning Protection for the Fuel Tank Installation”
(March 6, 2009)
For compliance with AWM 525.981(a)(3), two independent means for lightning protection must be provided for the structural aspects of the fuel tank. Each design feature must be shown to be independent and verified of its capability by testing.
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