Air Conditioning — Ram Air System — Emergency Ram Air Valve
- Published
- Effective
- Deadline
- Replaces
- 2021-38
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform an initial operational check of the ERAV within specified hours or months depending on aircraft usage, then repeat checks at intervals defined in the Maintenance Requirements Manual. Detailed inspections of the pack discharge and ram air supply ducts must also be conducted within specified timeframes and repeated regularly. If the valve is found inoperable, it must be replaced before further flight unless deferred under MMEL procedures. Damaged ducts must be replaced before further flight following inspection.
Summary
Airworthiness Directive CF-2021-38R1 is issued by Transport Canada concerning the air conditioning ram air system emergency ram air valve (ERAV) on MHI RJ Aviation ULC model CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25 aircraft. This directive addresses issues with the ERAV part number GG670-95019-1, which has been reported stuck in closed or partially open positions due to corrosion. The directive mandates operational checks and detailed inspections of the valve and related ducts to ensure continued air supply and cabin safety.
What changed
This revision CF-2021-38R1 clarifies the required actions when the valve itself is found inoperable rather than the entire system. It also provides updated maintenance instructions for replacing damaged pack discharge and ram air supply ducts. Additionally, it clarifies the use of Master Minimum Equipment List (MMEL) procedures for deferring valve replacement under specific conditions.
Why it matters
This directive is critical for operators and maintenance organizations to prevent loss of outside air supply, which can lead to increased cockpit and cabin temperatures and potential exposure to contaminated air. Compliance ensures aircraft safety and regulatory adherence, reducing the risk of in-flight environmental control system failures. It also impacts maintenance scheduling and parts replacement planning.
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