Airworthiness Directive · Amendment 39-10325 · Rolls-Royce Limited Dart Series Turboprop Engines
Rolls-Royce Limited Dart Series Turboprop Engines
Rolls-Royce Limited (R-R) Dart Mk. 506, 10, 511 series, 514 series, 525 series, 526, 527, 528 series, 529 series, 530, 531, 532 series, 535 series, 542 series, 551 series, and 552 series turboprop engines, installed on but not limited to the following aircraft: Gulfstream Aerospace Corp. G-159, British Aerospace HS 748, Fokker Aircraft F.27, Mitsubishi Heavy Industries YS-11, General Dynamics (Convair) 580 and 600 series, and Vickers Armstrongs (Aircraft Limited) Viscount.
This amendment supersedes an existing airworthiness directive (AD), applicable to Rolls-Royce Limited (R-R) Dart series turboprop engines, that currently establishes a life limit for propeller low torque switches. This amendment adds two propeller low torque switch part numbers and two R-R Dart engine models that were omitted from the current AD, and establishes a calendar end-date for removal of propeller low torque switches from service. This amendment is prompted by the need to add omitted part numbers and engine models to the AD. The actions specified by this AD are intended to prevent cracking of the snap diaphragm in the propeller low torque switch, which could delay propeller auto-feathering and thereby adversely affect aircraft controllability.
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.
