# SDR 2025FA0000421

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 12, 2024
- Submitted: June 24, 2025
- Operation: General aviation
- Aircraft: [N891DM](https://openairdocs.org/aircraft/N891DM), registered now
- Make and model: Cirrus SR22T
- Registry model: [Cirrus SR22T](https://openairdocs.org/model/cirrus-design-sr22t) (OpenAirDocs)
- Aircraft serial: 0353
- Aircraft time: 2,519 hours
- Engine: Cont TSIO550K
- Engine time: 537 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part serial: AC21IB171
- Condition: Cracked
- Part time: 537 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2025FA0000421

## Discrepancy

WHILE APPROACHING INTENDED DESTINATION OF SSI, LEVEL AT 5,000 FEET, THE PLANE STARTED VIBRATING/SHAKING WITH A LOSS OF PERCENT POWER AND MANIFOLD PRESSURE, AMONG OTHER INDICATIONS.  CYLINDER #6 EGT WENT OFFLINE, INDICATING A PROBLEM WITH THAT CYLINDER.  TURNED AROUND TO CLOSEST AIRPORT FHB AND MADE AN EMERGENCY LANDING.  UPON LANDING, DISCOVERED CYLINDER #6 HAD CRACKED AT THE HEAD BETWEEN THE ROCKER BOX COVERS.  CYLINDER SERIAL NUMBER IS AC21IB171 BUT UNSURE OF THE PART NUMBER.  THIS IS A FACTORY REMANUFACTURED ENGINE SERIAL NUMBER 1042372 FOR WHICH AD2020-16-11 DOES NOT APPEAR APPLICABLE; HOWEVER, AFTER THIS INCIDENT, IT WAS COMPLIED WITH ANYWAY, FOLLOWED IN JUNE 2025 BY ANOTHER CYLINDER (#5) CRACKING IN THE SAME FASHION.

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