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Labyrinth Seal


BDizzle
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They follow all of the main bearings, except for the zero bearing. The numbered bearings are located both in front and behind the compressor, and again in front of and behind the turbine. The #4 is the only one that is easy to reach, as you only have to tear apart the rear bearing support assy. The #3 requires removal of the turbine assy. The #1 and #2 lab seals, as far as I know, requires you to basically tear the engine down to the compressor assembly.

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We had a plane loose a few gallons of oil in flight, the maintenance folks said the lab seal was suspect. Sounds like the turbine ones can be done on base and the compressor ones require engine change, so I guess it just depends on what they find. I wanted to gain some knowledge on the subject.

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