# SDR 2026FA0000281

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2026
- Submitted: April 21, 2026
- Operation: General aviation
- Aircraft: [N633SR](https://openairdocs.org/aircraft/N633SR), registered now
- Make and model: Cirrus SR22
- Registry model: [Cirrus SR22](https://openairdocs.org/model/cirrus-design-sr22) (OpenAirDocs)
- Aircraft serial: 2014
- Aircraft time: 4,626 hours
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Brake Disc
- Part number: RA16402504
- Part serial: LOT1462220122
- Condition: Cracked
- Location: Zone 700
- Part time: 167 hours
- Stage of operation: TX
- How discovered: D
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000281

## Discrepancy

CRACKED AT ATTACHMENT FLANGE - AFTER DISCOVERY OF SHEARED LH BRAKE ROTOR FLANGE, RH BRAKE ROTOR REMOVED AND INSPECTED. 10X MAGNIFICATION REVEALED SEVERAL SPOTS OF PITTING CORROSION IN THE VALLEYS OF CIRCUMFERENTIAL MACHINING STRIATIONS AND POSSIBLE CRACK INDICATIONS. SUBSEQUENT FLUORESCENT PENETRANT INSPECTION REVEALED NUMEROUS SPOTS OF PITTING CORROSION IN CIRCUMFERENTIAL MACHINING STRIATIONS CLUSTERED NEAR THE THREE BOLT HOLES AT THE 90 DEGREE BEND FROM THE BODY TO THE ATTACHMENT FLANGE. FAINT CRACK INDICATIONS WERE ALSO OBSERVED IN ASSOCIATION WITH THE CORROSION AND FOLLOWED THE CIRCUMFERENTIAL MACHINING STRIATIONS. DISC WAS INSTALLED 11/05/2024 AND WAS IN SERVICE 1 YEAR AND 5 MONTHS.

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