Auxiliary Power Unit — Tailcone Upper Firewall Cracking
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Bombardier BD-100-1A10 aircraft with serial numbers 20003 to 20916 must perform a detailed visual inspection of the upper tailcone firewall within 48 months from May 3, 2022. Any detected cracks or defects must be repaired before further flight, and the rigid grounding braid must be replaced with the flexible exhaust connection cable as specified in the applicable Bombardier service bulletins.
Summary
The Canadian Airworthiness Directive CF-2022-19 addresses cracking in the upper firewall of the tailcone related to the Auxiliary Power Unit (APU) on Bombardier BD-100-1A10 aircraft with serial numbers 20003 to 20916. This directive mandates inspections and corrective actions to ensure structural integrity and electrical grounding safety. It specifically targets the replacement of the rigid grounding braid with a flexible exhaust connection cable to prevent firewall cracks.
What changed
CF-2022-19 introduces mandatory detailed visual inspections of the upper tailcone firewall for cracks and defects, requires repairs if any are found, and mandates replacing the rigid APU grounding braid with a flexible exhaust connection cable. This is a new regulation responding to reports of cracking caused by the rigid grounding braid attachment.
Why it matters
This directive is critical for operators and maintenance organizations to prevent potential breaches in the firewall that could compromise lightning protection and increase radio interference. Compliance ensures continued airworthiness and safety of the affected Bombardier BD-100-1A10 aircraft. It also helps maintain regulatory compliance with Canadian aviation safety standards.
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