Propeller Pitch Control Lever / Linkage - Inspection / Modification
- Published
- Effective
- Deadline
- Replaces
- 75-16-20
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must modify the PPC lever linkage by installing the secondary retention feature within 100 hours time-in-service or 12 months after February 2, 2021, whichever occurs first. They must also perform repetitive inspections of the PPC lever linkage as specified and report inspection results to the FAA. Operators should obtain and follow the relevant Mitsubishi and Honeywell service bulletins referenced in the AD.
Summary
The Federal Aviation Administration's Airworthiness Directive 2020-26-14 supersedes AD 75-16-20 and applies to all Mitsubishi Heavy Industries, Ltd. Models MU-2B series airplanes. It addresses the propeller pitch control (PPC) lever linkage, requiring modifications and repetitive inspections to prevent disconnection at the engine. This directive aims to ensure continued safe control of propeller pitch and engine power settings.
What changed
This AD replaces the previous AD 75-16-20 by introducing a mandatory modification to install a secondary retention feature on the PPC lever linkage, along with repetitive inspections. It also requires reporting inspection results to the FAA. The new rule expands applicability to additional MU-2B models and updates compliance procedures based on recent service bulletins.
Why it matters
This directive is critical for aviation professionals because it addresses a known unsafe condition where the PPC lever linkage can disconnect, potentially causing loss of propeller pitch control and engine power management. Operators and maintenance organizations must comply to maintain aircraft airworthiness and prevent in-flight control issues. Compliance ensures regulatory adherence and enhances flight safety for affected Mitsubishi MU-2B aircraft.
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New ADs and bulletins for Mitsubishi Heavy Industries MU-2B (USA production) and MU-2B, summarized like this page, every Monday.