Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes

This amendment adopts a new airworthiness directive (AD) that applies to certain British Aerospace HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes. This AD requires you to inspect the rudder quadrant support structure for cracks and correct D- washer installation; and also requires you to replace any cracked component and replace any incorrectly installed D-washers. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this AD are intended to detect, correct, and prevent further cracking in the rudder quadrant structure caused by incorrectly installed D-washers. Cracks in this structure could result in loss of rudder control with consequent airplane control problems.