Airworthiness Directive · Amendment 39-16430 · Bombardier Inc. Airplanes
Bombardier Inc. Airplanes
This AD applies to Bombardier Inc. DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, DHC-8-315.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
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: During a recent production fuel system test, it was found that all three flapper valves located in each collector tank did not conform to the design requirements, due to the fact that a valve spring was installed on the flapper hinge pin. This valve spring should have been removed prior to installation of the valves. * * * * * With the valve spring installed, the flapper valve is held closed by the valve spring, preventing gravity feed. In the event of scavenge system failure, the collector tank fuel level can no longer be maintained, potentially leading to an in-flight engine shutdown. * * * * * We are issuing this AD to require actions to correct the unsafe condition on these products.
