EASA SIB AIR-21-01: Textron Aviation (McCauley Propeller Systems) - Alternative Method of Compliance to FAA AD 2020-19-06

What to do

Operators and maintenance personnel should use the approved alternative compliance criteria when determining the eligibility of McCauley governors after serial number 180501 for installation. They must continue to comply with all other provisions of FAA AD 2020-19-06. Before using this AMOC, notify the appropriate principal inspector or local Flight Standards District Office/Certificate Holding District Office as required.

Summary

Textron Aviation (McCauley Propeller Systems) - Alternative Method of Compliance to FAA AD 2020-19-06 is an FAA-approved alternative method of compliance for Airworthiness Directive 2020-19-06. It specifically addresses the eligibility criteria for installation of McCauley governors with serial numbers after 180501, including new governors and those maintained according to specific McCauley Alert Service Bulletins. This document applies to McCauley propeller governors used on affected aircraft.

What changed

This document approves an alternative method of compliance to paragraph (f) of FAA AD 2020-19-06, allowing the use of additional documentation and criteria to determine governor eligibility for installation. It permits using completion records from McCauley Alert Service Bulletins ASB237, ASB237A, ASB273B, or ASB273C as evidence of compliance. It also clarifies that new governors after serial number 180501 that have not been disassembled or are new spare parts are eligible for installation under this AMOC.

Why it matters

This approval provides operators and maintenance organizations with more flexibility in demonstrating compliance with FAA AD 2020-19-06, potentially reducing inspection burdens and downtime. It ensures that only properly maintained or new McCauley governors are installed, maintaining safety while streamlining maintenance processes. Compliance teams can rely on recognized service bulletin documentation to verify eligibility, simplifying record-keeping and audit readiness.