That o-ring on the #2 hydraulic pump let go at 4am in Tulsa

I was doing a routine A-check on a 737 last Tuesday around 4am in Tulsa when I found hydraulic fluid pooling under the #2 engine pump, and the o-ring had basically turned to mush. We ended up swapping the pump and bleeding the whole system, which pushed the plane two hours late and the crew was not happy. Has anyone else run into those o-rings failing way before the book says they should, or did I just get a bad batch?

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margaret30419d ago

I always figured those o-ring failures were just a myth or something guys made up to explain bad luck on the line, but after watching one turn to jelly at 4am I don't buy that anymore. The book intervals clearly don't match what these things actually see in service, especially on the #2 pump where the heat cycles are brutal. Sounds like you got a bad batch or the shelf life on those rings was already shot before they ever hit the plane.

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