Cabin Pressure Control System - Safety Valve — Overtorque
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the torque of the swivel nuts on the V-band clamps for the safety valves by August 31, 2020, following the applicable Bombardier Service Bulletin instructions. If torque is below or above 80 lb-in, specific inspection and replacement procedures must be followed before the next flight. Replacement of affected safety valves must be completed by August 31, 2021, if required.
Summary
The Canadian Airworthiness Directive CF-2020-16 titled "Cabin Pressure Control System - Safety Valve — Overtorque" addresses Bombardier BD-700-1A10 and BD-700-1A11 aircraft with specific serial numbers. It mandates inspection and corrective actions for the safety valves (part number GG435-3006-3) in the cabin pressure regulation system due to potential overtorque issues during installation. This directive ensures the integrity of the cabin pressure system by preventing possible leaks or depressurization.
What changed
CF-2020-16 introduces mandatory inspections of the torque applied to the swivel nut of V-band clamps securing safety valves in the cabin pressure regulation circuits. It requires visual and detailed inspections of the valves and mounting flanges, with replacement or repair if damage or fatigue is detected. The directive also specifies compliance with Bombardier Service Bulletins 700-21-6009 and 700-21-5009 for the respective aircraft models.
Why it matters
This directive is critical for operators and maintenance organizations to prevent cabin depressurization risks caused by improperly torqued safety valve clamps. Ensuring correct installation and condition of these components maintains aircraft safety and airworthiness. Compliance helps avoid in-flight pressure loss incidents and potential costly repairs or operational disruptions.
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