Hawker Beechcraft Corporation has issued Revision 1 to Mandatory Service Bulletin 25-2394, which describes an insepction of washers used in mounting shoulder harnesses in certain Beech piston airplanes. This revision brings the current MSB into conformity with a revision to FAA Airworthiness Directive 2009-25-01, which similarly added the A36TC to the list of affected airplanes.

See MSB 25-2394 revision 1.