Fire Protection — Fire Extinguisher Bottle Available Push Button Annunciators (PBAs) — Do Not Illuminate After Direct Current (DC) Bus Loss
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Airbus Canada BD-500-1A10 and BD-500-1A11 aircraft must upgrade the ICCP RDC software following ACLP Service Bulletin BD500-311001 within 24 months from the effective date of May 18, 2023. Maintenance and continuing airworthiness teams should coordinate to schedule and complete the software upgrade promptly. Any alternative means of compliance must be approved by Transport Canada.
Summary
Canadian Airworthiness Directive CF-2023-28 addresses a fire protection issue in Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft. The directive focuses on the fire extinguisher bottle available push button annunciators (PBAs) that fail to illuminate after a direct current (DC) bus loss, potentially misleading flight crews during engine fire events. This AD mandates a software upgrade to restore proper PBA functionality.
What changed
CF-2023-28 introduces a mandatory upgrade of the integrated cockpit control panel (ICCP) remote data concentrator (RDC) software to correct the failure of the AVAIL legend on BTL 1 and BTL 2 PBAs to illuminate green after a DC bus loss. This upgrade resolves the misleading indication that could affect crew response during engine fire emergencies. The directive also references a related Service Bulletin and Flight Operation Note issued by Airbus Canada.
Why it matters
This directive is critical for aviation professionals because the incorrect PBA indication can cause hesitation or improper actions by flight crews when responding to engine fires, potentially compromising safety. Operators and maintenance teams must ensure compliance to maintain the reliability of fire extinguishing controls and avoid operational risks. The software upgrade restores intended system behavior, supporting effective emergency response and regulatory compliance.
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