AD NUMBER: 2003-02-51 MANUFACTURER: Bombardier SUBJECT: Airworthiness Directive 2003-02-51
SUMMARY: Transport Canada Civil Aviation (TCCA), which
is the airworthiness authority for Canada, advises that vibration
and fuel line misalignment in the center tank has resulted in
damage to fuel line couplings and cracks in the fuel feed lines.
TCCA also advises that more recently four incidents have been
reported of cracked fuel feed lines near the welded boss for the
transfer ejector motive flow lines within the center fuel tank. The
airplanes landed without incident. As a result of the fuel leakage
into the center tank, an imbalance of fuel could occur within the
fuel system and a significant amount of fuel may not be usable
during flight. Discrepancies in the fuel distribution system, if
not detected and corrected, could cause the center tank to overfill
and fuel to leak from the center tank vent system or to become
inaccessible, and could result in engine fuel starvation.