# SDR UIEA2026040800153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2026
- Submitted: May 27, 2026
- Operation: Air carrier
- Aircraft: [N477MC](https://openairdocs.org/aircraft/N477MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29255
- Aircraft time: 108,821 hours, 19,065 cycles
- System (JASC): [5710 · Wing Main, Frame Structure](https://openairdocs.org/jasc/5710)
- Part: Structure
- Condition: Corroded
- Location: Zone 500
- 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/UIEA2026040800153

## Discrepancy

L/H WLG W/W STA 1241 AREA CENTER TANK L/H JETTISON TRANSFER VLV (V1) CUTOUT FOUND CORROSION.(<P>CORROSION AREA REMOVED AS PER SRM 51-10-01 AND REPROTECTED AS PER SRM 51-20-01, REWORK AREA MEASURED ORIGINAL: 0.496" L : 4" X W : 4" X D: 0.012", WITHIN SRM 57-10-10-1A-2 ALLOWABLE DAMAGE 2 FIG 101 LIMITS. NO FURTHER DEFECTS NOTED</P>)

---
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.