AD 2001-18-07 Amendment 39-12433

This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Beech Models 1900, 1900C, and 1900D airplanes. This AD requires you to inspect all four flap flexible shaft assemblies for the correct diagonal wrap and the correct installation. This AD also requires you to replace any flap flexible shaft assembly that has an incorrect diagonal wrap or incorrect installation. This 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 this 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.