AD Amdt-39-11485
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | Limited Dart Series | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
Unsafe Condition
Unapproved Klixon low torque switches could fail, leading to a propeller failing to auto-feather following an engine power loss, resulting in possible loss of control due to high asymmetric drag.
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Required Actions
Within 3 months after the effective date, visually inspect the interior of the switch to determine the type of low torque switch. If a Klixon low torque switch (P/N 6PS-25-1) is installed, remove it from service and replace with an approved low torque switch.
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Compliance Time
Within 3 months after the effective date of February 28, 2000.
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Affected Aircraft
Rolls-Royce Limited Dart 506, 510, 511, 514, 525, 526, 529, 530, 531, 532, 535, 542, and 552 series turboprop engines, installed on aircraft such as 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.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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