Pneumatic – High Pressure Valve - Butterfly Clip Failure
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus Canada BD-500-1A10 and BD-500-1A11 aircraft must comply with the directive by not dispatching aircraft under the specified MEL items related to the high pressure valve butterfly clip failure starting from the effective date. Maintenance teams should inspect and correct any butterfly clip failures as soon as possible. Compliance is mandatory as of 22 June 2026, the effective date of the directive.
Summary
The Pneumatic – High Pressure Valve - Butterfly Clip Failure Emergency Airworthiness Directive CF-2026-33 issued by Transport Canada applies to Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft models. This directive addresses the failure of butterfly clips on high pressure valves which may lead to bleed system isolation issues, hot air leaks, and potential structural overheating. It prohibits dispatching affected aircraft under certain Minimum Equipment List (MEL) items until corrective actions are taken.
What changed
This new Airworthiness Directive introduces a prohibition on dispatching aircraft under specific MEL items related to the high pressure valve butterfly clip failure. It identifies affected MEL items and associated crew alerting system messages that must be considered. The directive serves as an interim measure pending further regulatory action.
Why it matters
This directive is critical for aviation professionals as it highlights a latent failure mode that may not be detected during normal operations but can compromise aircraft safety through bleed air system malfunction and structural overheating. Operators and maintenance organizations must ensure compliance to prevent unsafe flight conditions and avoid regulatory penalties. It also impacts dispatch decisions under the MEL, requiring careful monitoring and adherence.
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New ADs and bulletins for Airbus BD-500 (A220 Series), Canada BD-500-1A10 and Canada BD-500-1A11, summarized like this page, every Monday.