| 21. | NASA also found slight singeing of the O-ring seals of nozzle segments taken from recent back-to-back shuttle flights.
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| 22. | When the stopper is down, the O-ring seals the drain to keep water from seeping past the stopper.
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| 23. | Solid rocket boosters are recovered after each shuttle launch, and the O-ring seals are examined carefully by NASA engineers.
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| 24. | Cylinder seals are a form of impression seal, a category which includes the stamp seal and finger ring seal.
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| 25. | The obstruction turned out to be a piece of debris _ an O-ring seal from an earlier supply ship.
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| 26. | NASA's next space shuttle flight has been delayed indefinitely because of concern over O-ring seals in the rocket boosters.
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| 27. | The cylinder liners are made of centrifugally cast iron, two rubber rings seal the liners off from the crankcase.
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| 28. | Other cartridges may be difficult to eject, and some have been known to puncture the O-ring seal and create leaks.
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| 29. | O-ring seals in the booster nozzle joints of Atlantis and Discovery were singed by hot rocket gas earlier this summer.
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| 30. | Then, hot rocket gas seeped through thermal insulation surrounding O-ring seals in the solid-fuel rocket boosters of Atlantis and Discovery.
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