Propellers - Pitch Control Lever and Assembly - Inspection / Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the PPC lever within 100 hours time-in-service after February 26, 2021, and every 100 hours thereafter until the PPC assembly is replaced and the safety wire installed. The PPC assembly must be replaced or reworked within 600 hours time-in-service or 12 months after the effective date, whichever occurs first. After replacement, the secondary retention feature must be installed before further flight to terminate repetitive inspections.
Summary
FAA Airworthiness Directive 2021-01-02 is a final rule addressing M7 Aerospace LLC Models SA26-AT and SA26-T airplanes equipped with TPE331 engines. It mandates inspections and replacement procedures for the propeller pitch control (PPC) lever and assembly to prevent detachment of the power lever linkage from the PPC shaft. This directive aims to enhance flight safety by ensuring proper torque and retention of the PPC assembly.
What changed
This new airworthiness directive introduces repetitive inspections of the PPC lever for proper torque and security, requiring corrective actions if detachment is detected. It also mandates replacement or rework of the PPC assembly and installation of a secondary retention feature (safety wire) within specified compliance times. The directive terminates repetitive inspections once the replacement and retention feature installation are completed.
Why it matters
This AD is critical for aviation professionals because detachment of the power lever linkage from the PPC shaft can cause uncommanded engine power changes, leading to potential loss of control. Operators and maintenance personnel must ensure compliance to maintain aircraft safety and airworthiness. The directive provides clear procedures and deadlines to prevent unsafe conditions related to propeller pitch control failures.
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