Airworthiness DirectiveEASA AD CF-2020-03

Fuel System - Primary Ejector Fuel Feed Flexible Hoses Inner Tube Cracking

Published: Mar 9, 2020
Effective: Mar 19, 2020

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must replace the affected flexible hoses according to the schedule defined in CF-2020-03, which varies by aircraft model, serial number, and flight hours since incorporation of the previous service bulletin. Replacement must follow Bombardier Service Bulletin 670BA-28-040 or its approved revisions. Compliance deadlines range from before reaching 40,000 flight hours to within 8,800 flight hours after the directive's effective date of March 19, 2020.

Summary

The Canadian Airworthiness Directive CF-2020-03 addresses cracking in the inner tube of primary ejector fuel feed flexible hoses on Bombardier aircraft models CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25 within specified serial number ranges. This directive mandates replacement of affected flexible hoses that may have a thinner-than-required Teflon lining, which can lead to fuel leaks and potential engine flameouts. The directive aims to ensure continued safe operation by mitigating fuel system failures related to these components.

What changed

CF-2020-03 introduces mandatory replacement requirements for primary ejector fuel feed flexible hoses with serial numbers 001 to 2470 that were installed per Bombardier Service Bulletin 670BA-28-008C. It requires compliance with Bombardier Service Bulletin 670BA-28-040 dated September 30, 2019, to remove hoses susceptible to inner tube cracking. The directive establishes specific compliance timelines based on aircraft model, serial number, and accumulated flight hours.

Why it matters

This directive is critical for operators and maintenance organizations to prevent fuel leaks inside the central fuel tank that can cause lateral fuel imbalance and increase the risk of in-flight engine shutdowns. Compliance reduces the likelihood of emergency descents or technical interruptions during flight, thereby enhancing flight safety and operational reliability. It also ensures adherence to Canadian aviation regulations and maintains aircraft airworthiness.

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