Airworthiness DirectiveEASA AD CF-2023-17

Pneumatic — Non-Conforming Bleed Air Leak Detection System Sensing Elements

Published: Mar 9, 2023
Effective: Mar 22, 2023
Replaces: CF-2022-38R1
Replaces: CF-2022-38

Bombardier BD-700 1A10 1A11

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What to do

Operators must prohibit installation of affected sensing elements unless tested and marked as serviceable. Maintenance records must be reviewed within 60 days to identify installed affected parts. Affected sensing elements must be tested and replaced within 2000 flight hours or 120 months from the AD effective date. Operational restrictions under the MMEL apply until corrective actions are completed. Compliance deadlines vary by aircraft group and part installation history.

Summary

Canadian Airworthiness Directive CF-2023-17 addresses a safety issue with non-conforming bleed air leak detection system sensing elements on Bombardier BD-700-1A10 and BD-700-1A11 aircraft, serial numbers 9002 through 9879, 9998, and 60001 and subsequent. The directive mandates testing and replacement of sensing elements that may have insufficient salt fill, which could impair detection of hot bleed air leaks. This AD supersedes previous directives CF-2022-38 and CF-2022-38R1 and incorporates Bombardier service bulletins for corrective actions.

What changed

CF-2023-17 supersedes AD CF-2022-38R1 and introduces mandatory incorporation of Bombardier service bulletins that provide testing procedures for affected sensing elements and require replacement of discrepant parts. It also reclassifies certain aircraft serial numbers into a new Group D due to affected parts installed during production. The AD corrects previous typographical errors and expands compliance requirements based on updated findings.

Why it matters

This directive is critical for operators and maintenance organizations to ensure the bleed air leak detection system functions correctly, preventing undetected hot bleed air leaks that could cause structural damage and compromise safe flight and landing. Compliance helps maintain aircraft airworthiness and avoids dispatch with unsafe equipment. It also clarifies maintenance and operational restrictions to mitigate risk until corrective actions are completed.

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