Airborne Auxiliary Power — Auxiliary Power Unit Scroll Housing Assembly — Replacement
- Published
- Effective
- Deadline
- Replaces
- 2023-0056
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Airbus A330 and A340 aeroplanes must replace the affected APU scroll housing assemblies within 36 months after 30 March 2023, following the Airbus Aircraft Maintenance Manual or Honeywell Service Bulletin instructions. Installation of affected APUs is prohibited after modification or from the directive's effective date for unaffected aircraft. Re-identification of certain parts per the service bulletin is an acceptable compliance method.
Summary
EASA Airworthiness Directive 2023-0158 is an official regulatory document addressing the replacement of Auxiliary Power Unit (APU) scroll housing assemblies on Airbus A330 and A340 aeroplanes equipped with Honeywell GTCP331-350[C] APUs. The directive applies to specific part numbers of the APU scroll housing assemblies and mandates corrective actions to prevent potential damage caused by cracks in the affected parts.
What changed
This directive supersedes EASA AD 2023-0056 and updates the definition of affected APUs by clarifying that letters in the APU serial number only identify the manufacturing facility and do not affect compliance requirements. It retains the original replacement requirements but provides refined instructions regarding affected parts and compliance methods.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk involving cracks in the APU scroll housing assembly that could lead to hot air leakage, damage to the APU compartment, and loss of APU doors. Operators and maintenance organizations must ensure compliance to avoid operational disruptions and maintain aircraft airworthiness.
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