Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Raytheon Aircraft Company (Raytheon) Beech Models 1900, 1900C, and 1900D airplanes. The proposed AD would require you to inspect all four flap flexible shaft assemblies for the correct diagonal wrap and the correct installation. The proposed AD would also require you to replace any flap flexible shaft assembly that has an incorrect diagonal wrap or incorrect installation. The proposed AD is the result of several occurrences of flap extension/retraction failures on the affected airplanes due to the inner flexible shaft ends separating or disengaging. The actions specified by the proposed Ad are intended to prevent these flap extension/retraction failures due to incorrectly configured flap flexible shaft assemblies. Such failure could result in an asymmetric flap condition during flight if the flap safety switch fails to function properly.