EASA AD 2023-0073R2: Electrical Power — DC Starter Generator — Inspection

What to do

Operators must inspect affected DC starter generators before exceeding 150 flight hours since installation or brush replacement, and then at intervals specified in the SAAB Service Bulletin 340-24-056. If brushes are found unserviceable, the affected part must be replaced with a serviceable or improved part before the next flight. Installation of improved parts eliminates the need for further inspections. Inspection results must be reported to SAAB AB within 30 days.

Summary

EASA Airworthiness Directive 2023-0073R2 is an updated regulation addressing inspection requirements for DC starter generators installed on SAAB SF340A and SAAB 340B aeroplanes. It targets affected DC starter generators with Part Number 23080-031 Mod M and brushes Part Number 23080-2017 manufactured between 2021 and November 2023. The directive mandates inspections to detect excessive brush wear that could lead to starter generator failure and loss of electrical power.

What changed

This revision confirms that improved DC starter generators manufactured before 2021 or after November 2023 are no longer subject to the unsafe condition. It updates inspection intervals and clarifies that installation of improved parts terminates the need for repetitive inspections. The directive also incorporates the improved tamping process implemented by Safran Power USA for brush manufacturing.

Why it matters

This directive is critical for operators and maintenance organizations to prevent potential starter generator failures that could compromise aircraft electrical power systems. Compliance ensures continued airworthiness and operational safety of SAAB 340 series aircraft. It also affects parts procurement and maintenance scheduling by distinguishing between affected, serviceable, and improved parts.

What to do

Summary

What changed

Why it matters

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