Bombardier CRJ200 operators in Canada and the EU face narrow compliance windows for replacing a flap component to help prevent fluid leakage prevalent in the original design.

Transport Canada in an Oct. 30 directive mandated replacement of certain flap actuator seals, giving operators 30 days from the order’s Nov. 14 effective date to complete the work. The European Aviation Safety Agency on Nov. 1 adopted the same directive, including the effective date and 30-day compliance time.

Transport Canada says a redesigned pinion seal made by flap actuator manufacturer Eaton has proven to be more reliable. The regulator says it based its decision on a sampling program and “recent” flap reliability data.

Affected seals are found on three flap actuator part numbers.

Bombardier incorporated the fix into the CRJ200 maintenance manual in a revision issued in July.