# SDR IPXA2026042205165

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2026
- Submitted: April 23, 2026
- Operation: Air carrier
- Aircraft: [N421UP](https://openairdocs.org/aircraft/N421UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25281
- Aircraft time: 35,922 hours, 23,455 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Ball Mat
- Part number: 8054518
- Condition: Corroded
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026042205165

## Discrepancy

MAIN DECK BALL MAT 231BM3 UNDER SIDE SKIN HAS CORROSION AT ALL BALL CUTOUTS.  OUT OF SEQUENCE STEP 6 INSPECTED FABRICATIN OF NEW SKIN FOR BALLMAT 231BM3 IAW B757 GMM09-08-01-04 SREO 11648-RQ002.

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