# SDR UALA2013070104552

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 28, 2013
- Submitted: July 25, 2013
- Operation: Air carrier
- Aircraft: [N121UA](https://openairdocs.org/aircraft/N121UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29167
- Aircraft time: 58,897 hours, 6,853 cycles
- Engine: Pwa PW4056
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Condition: Corroded
- Location: Bs 1480
- 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/UALA2013070104552

## Discrepancy

SKIN INTERNAL SURFACE CORRODED AT BS 1480, S4L-4R, 4L-12L, 4R-12R, 12L-18L.   CUT OUT DAMAGED SKIN. MFG & INSTALLED FILLERS, DOUBLERS, & TRIPLERS IAW ECRA 5330-04576, 5330-04577, 5330-04578.  MAJOR REPAIR.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.