Airworthiness Directive · Amendment 39-15552 · Fuel
Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) and CL-600-2D24 (Regional Jet Series 900) Airplanes
This AD applies to Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, serial numbers 10003 through 10169 inclusive; and Model CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 through 15025 inclusive; certificated in any category.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: * * * * * The assessment and lightning tests showed that certain fuel tube self-bonded couplings do not provide sufficient lightning current capability. The assessment also showed that single failure of the integral bonding wire of the self-bonded couplings could affect electrical bonding between the tubes. Insufficient electrical bonding between fuel tubes or insufficient current capability of fuel tube couplings, if not corrected, could result in arcing and potential ignition source[s] inside the fuel tank during lightning strikes and consequent fuel tank explosion. * * *
Within 4,500 flight hours after the effective date of this AD, unless already done, do the following actions.
(1) For airplanes on which Bombardier Service Bulletin 670BA-28-014, dated January 4, 2005, has not been incorporated as of the effective date of this AD: Replace fuel tube couplings inside the wing and center fuel tanks with redesigned couplings, in accordance with Part A of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-28-014, Revision A, dated May 7, 2007.
(2) For airplanes on which Bombardier Service Bulletin 670BA-28-014, dated January 4, 2005, has been incorporated as of the effective date of this AD: Do a visual inspection of the aft scavenge ejector fuel couplings inside the left- and right-hand wing fuel tanks to determine if redesigned couplings are installed, and replace with redesigned couplings as applicable, in accordance with Part B of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-28-014, Revision A, dated May 7, 2007.
Note: This AD differs from the MCAI and/or service information as follows: No differences.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
