Why would I risk my livelihood and the lives of a hundred plus passengers and crew just to save a few minutes and a few bucks. If at all possible I change all o-rings, static or dynamic. The oil filler cap is the only exception off the top of my head, its changed by task card on a time basis. If I have no alternative but to reuse a o-ring I can defer its replacement for 1 day per my companies approved maintenance program.
"Note: If applied to an ETOPS aircraft, contact SEAMC to “TOP” defer the aircraft along with the1 day deferral. Refer to ETOPS Manual E05-00-12 for “TOP” procedures.
During maintenance, if the instructions require the replacement of an O-ring or seal and the part is not available:
(1) If the existing O-ring or seal is reused:
(a) Verify the existing O-ring or seal is not deformed, worn, torn or degraded.
(b) Create a 1 day deferral to have the discrepant O-ring or seal replaced.
(c) Perform a “leak check” as required."
