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 Post subject: Storing a Jet Engine
PostPosted: 20 Jun 2018, 23:03 
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One can "pickle" a piston engine, store it, and expect a good engine when you re-install the engine. Can one do this with a jet? Are jet engines economically storable, or do the components time out on a calendar basis?


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 Post subject: Re: Storing a Jet Engine
PostPosted: 20 Jun 2018, 23:16 
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Username Protected wrote:
Can one do this with a jet?

Yes, the maintenance manuals generally have storage procedures.

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Are jet engines economically storable, or do the components time out on a calendar basis?

Generally, the engine parts are cycle and hour limited, not calendar time.

There may be certain things, notably some sort of corrosion inspection, which requires calendar time.

Jet and turboprop engines sit much better than piston engines. The oil contains no combustion by products (which contains water and acids) unlike a piston engine. The air path in the engine has few if any steel parts.

Mike C.

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 Post subject: Re: Storing a Jet Engine
PostPosted: 20 Jun 2018, 23:54 
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Username Protected wrote:
Can one do this with a jet?

Yes, the maintenance manuals generally have storage procedures.

Quote:
Are jet engines economically storable, or do the components time out on a calendar basis?

Generally, the engine parts are cycle and hour limited, not calendar time.

There may be certain things, notably some sort of corrosion inspection, which requires calendar time.

Jet and turboprop engines sit much better than piston engines. The oil contains no combustion by products (which contains water and acids) unlike a piston engine. The air path in the engine has few if any steel parts.

Mike C.


Well, I think most turbines have run time minima or max time sitting idle. RR engines on the G-streams I think need to be run every 30 days, or they face costly inspection (from what I heard). Like, really, really, really costly. TPE's are kind of the same - can't remember the times right now, but it's less than one would think. To the point where we've all broken the recommended rules many times over. I can guarantee you went over when you spent time in the UK. And I've certainly done it multiple times having my plane sitting forever at a mechanic's. Did we break any laws? Most likely not part 91, but if we'd been a part 135 operation we probably did.
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 Post subject: Re: Storing a Jet Engine
PostPosted: 21 Jun 2018, 00:39 
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Well, I think most turbines have run time minima or max time sitting idle. RR engines on the G-streams I think need to be run every 30 days, or they face costly inspection (from what I heard). Like, really, really, really costly. TPE's are kind of the same - can't remember the times right now, but it's less than one would think.

The "run every X days" requirement is if you DON'T preserve the engine.

The TPE331 maintenance manual gives instructions on how to preserve the engine. Consists mostly of draining fluids, putting in preservation fluids, covers for openings, and a color indicating desiccant. The desiccant is to be checked every month while in storage and replenished if color changes. The manual suggests the engine can be kept this way indefinitely.

Mike C.

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 Post subject: Re: Storing a Jet Engine
PostPosted: 21 Jun 2018, 14:47 
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Storage on-wing or storage in a container?


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 Post subject: Re: Storing a Jet Engine
PostPosted: 21 Jun 2018, 14:56 
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Storage on-wing or storage in a container?


This. In a past life, I transported pickled military turbine engines. They were drained of fluids and placed in round metal containers that kind of resemble an iron lung. The containers were filled with inert gas and could be stored that way essentially forever. I recall on several occasions shipping to active service areas engines in containers that had labels showing they were packed in the 1970s.

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 Post subject: Re: Storing a Jet Engine
PostPosted: 22 Jun 2018, 12:07 
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In a past life, I transported pickled military turbine engines. They were drained of fluids and placed in round metal containers that kind of resemble an iron lung.
They still got 'em. I saw rows of them last week in the Boneyard at Davis Monthan. But they also had rows of engines just shrink-wrapped so maybe they're switching to that.


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