Airworthiness Directive · Amendment 39-11485 · Rolls-Royce Limited Dart Series Turboprop Engines
Rolls-Royce Limited Dart Series Turboprop Engines
Rolls-Royce Limited (R-R) Dart 506, 510, 511, 514, 525, 526, 529, 530, 531, 532, 535, 542, and 552 series turboprop engines, installed on but not limited to Gulfstream Aerospace Corp. G-159, British Aerospace HS 748, Fokker Aircraft F.27, Mitsubishi Heavy Industries YS-11, General Dynamics (Convair) 640 and 600 series, and Vickers Armstrongs (Aircraft Limited) Viscount.
This amendment adopts a new airworthiness directive (AD), applicable to certain Rolls-Royce Limited Dart series turboprop engines. This amendment requires a one-time visual inspection of the interior of the switch to determine the type of low torque switch, and removal from service of unapproved Klixon low torque switches and replacement with serviceable parts. This amendment is prompted by the discovery of unapproved low torque switches in fleet operation. The actions specified by this AD are intended to prevent possible low torque switch failure, which could result in failure of a propeller to auto-feather following an engine power loss, resulting in possible loss of control of the airplane due to high asymmetric drag.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
