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Does anyone know why there is no tolerance on the hydrostatic check of the O2 cylinder? It’s an outlier from the other scheduled maintenance that happens around the 60mo period.

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yes a 5 year item based on the bottle age from manufacture its Providence not how long its been installed in the airplane

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As i understand the oxygen tank life is independent of airplane install date and based on its birth ( manufacture) date

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As i understand the oxygen tank life is independent of airplane install date and based on its birth ( manufacture) date

This is correct.