Air Conditioning — Integrated Air System Control (IASC) — Cabin Pressure Sensors Drifting
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of ACLP BD-500-1A10 and BD-500-1A11 aircraft must remove and replace affected IASCs within 3000 flight hours from May 13, 2025. Until replacement, aircraft dispatch under specified MEL items requires additional checks of cabin differential pressure before flight. Installation of affected IASCs as replacement parts is prohibited unless modified per Liebherr-Aerospace Toulouse SAS service bulletin.
Summary
Airworthiness Directive CF-2025-25 is issued by Transport Canada and applies to Airbus Canada Limited Partnership (ACLP) model BD-500-1A10 and BD-500-1A11 aeroplanes. The directive addresses an issue with drifting cabin pressure sensors in the Integrated Air System Control (IASC) units, which can cause cabin altitude overshoots and potentially compromise aircraft structural integrity. It mandates replacement of affected IASCs and operational restrictions until corrective actions are completed.
What changed
This new Airworthiness Directive introduces mandatory removal and replacement of specific IASCs with drifting cabin pressure sensors on affected ACLP BD-500-1A10 and BD-500-1A11 aircraft. It also imposes additional operational dispatch restrictions under certain Minimum Equipment List (MEL) items until the affected parts are replaced. Installation of affected IASCs as replacement parts is prohibited unless they have been properly modified and labeled.
Why it matters
This directive is critical for aviation professionals to prevent undetected high cabin differential pressure that could affect aircraft structural safety. Operators and maintenance organizations must ensure compliance to avoid flight safety risks and regulatory penalties. The MEL restrictions and replacement requirements impact dispatch decisions and maintenance planning for affected aircraft.
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