# SDR VNAA202206031111

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2022
- Submitted: June 3, 2022
- Operation: Air carrier
- Aircraft: [N558NN](https://openairdocs.org/aircraft/N558NN), registered now
- Make and model: Cndair CL6002D24
- Aircraft serial: 15342
- Aircraft time: 17,296 hours, 15,616 cycles
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Drain Mast
- Condition: Corroded
- 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/VNAA202206031111

## Discrepancy

DURING OVERNIGHT MAINTENANCE OPERATION IN CINCINNATI/NORTHERN KENTUCKY INTERNATIONAL AIRPORT (CVG) IN HEBRON, KY, THE MAINTENANCE TEAM IDENTIFIED 5 AREAS OF LIGHT CORROSION PITTING IN THE FUSELAGE SKIN (P/N MM690-35146-013) AT THE AFT DRAIN MAST. THE DAMAGE IS LOCATED BETWEEN FS1031.00-FS1051.30 FROM STRINGER 27 TO 26R. THE CORROSION DAMAGED WAS MEASURED TO BE 0.002Ï¿½, 0.0025Ï¿½, 0.003Ï¿½, 0.001Ï¿½, AND 0.0025Ï¿½ DEEP / C/W PERM REPAIR FOR CORROSION UNDER AFT DRAIN MAST IAW EA 22-C9-53-0613 REV.A AND REINSTALLED AFT DRAIN MAST IAW CRJ900 AMM 38-32-12-400-801-A01 CHECKS GOOD.

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