EASA SIB NM-12-20
[Correction] Carleton Technologies Inc. - Oxygen System Cylinder- and Valve Assemblies
Summary
The document titled '[Correction] Carleton Technologies Inc. - Oxygen System Cylinder- and Valve Assemblies' is a Special Airworthiness Information Bulletin (SAIB: NM-12-20) issued by the FAA. It addresses the correct operation of Carleton Technologies Inc. oxygen system cylinder and valve assemblies with part numbers B42365-1 and B43570-1, which are installed on various transport category airplanes. The bulletin provides guidance to ensure proper handling of the variable torque shutoff valve to maintain oxygen system effectiveness during emergencies.
What Changed
This SAIB clarifies the correct operation of the shutoff valve on Carleton Technologies Inc. oxygen cylinders, highlighting that the valve may appear open when only partially open due to its variable torque design. It introduces recommendations based on Carleton Technologies' Service Information Letter SIL-04577-35-006 dated May 21, 2010, but does not mandate any changes to existing maintenance procedures or issue an airworthiness directive.
Why It Matters
Understanding the variable torque design of the oxygen cylinder shutoff valve is critical for operators and maintenance personnel to prevent misinterpretation of valve position, which could compromise oxygen system effectiveness during emergencies. Proper training and adherence to the guidance help ensure flightcrew oxygen systems function reliably, enhancing safety and compliance for operators and maintenance organizations.
What To Do
Operators and maintenance crews should follow the guidelines in Carleton Technologies Inc. Service Information Letter SIL-04577-35-006 for opening and closing the affected oxygen cylinder and valve assemblies. Maintenance personnel must be properly trained before servicing these assemblies. Additionally, flight deck oxygen systems should be tested using the 'push-to-test' method each time a flight deck oxygen cylinder is replaced, following approved maintenance procedures. No specific compliance deadlines are stated.