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10 Feb 2026, 17:58 [ UTC - 5; DST ]


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 Post subject: Continental SB25-04: GTSIO520, IO-550, TSIO550, TSIOF550
PostPosted: 06 Feb 2026, 02:19 
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Joined: 01/30/09
Posts: 3959
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Location: $ilicon Vall€y
Aircraft: Columbia 400
Contental CSB25-04 calls for inspecting the cylinder head between the exhaust port rocker arm are for cracks at 50hr intervals.

https://continental.aero/wp-content/upl ... B25-04.pdf


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 Post subject: Re: Continental SB25-04: GTSIO520, IO-550, TSIO550, TSIOF550
PostPosted: 06 Feb 2026, 12:55 
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Joined: 04/18/10
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Location: OFallon, MO (KSUS)
Aircraft: 1968 Bonanza V35A
Glad I have Superior Millennium Cylinders on my OH RAM IO-550B-RA and didn’t buy the Factory new IO-550!!!

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 Post subject: Re: Continental SB25-04: GTSIO520, IO-550, TSIO550, TSIOF550
PostPosted: 06 Feb 2026, 13:34 
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Joined: 05/04/11
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Location: Covington, GA
Aircraft: 421C, 58
This affects tuned-induction engines. Standard bonanza and baron engines are not affected.


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 Post subject: Re: Continental SB25-04: GTSIO520, IO-550, TSIO550, TSIOF550
PostPosted: 06 Feb 2026, 13:43 
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Company: Skyhaven Airport Inc
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Odd there is no range of serial numbers. Is it just all cylinders of that design?

After this many years and thousands of hours they are just becoming a problem?

I would think they would have an hour figure or other data.


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 Post subject: Re: Continental SB25-04: GTSIO520, IO-550, TSIO550, TSIOF550
PostPosted: 06 Feb 2026, 17:09 
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Joined: 01/30/09
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Location: $ilicon Vall€y
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All cylinders, no serial number ranges. Affects cross-flow cylinders.

It only covers the specific models in the SB (too many characters for the thread title).


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