# SDR DALA1010936301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2010
- Submitted: May 24, 2010
- Operation: Air carrier
- Aircraft: [N661US](https://openairdocs.org/aircraft/N661US), registered now
- Make and model: Boeing 747451
- Aircraft serial: 23719
- Aircraft time: 87,252 hours, 23,719 cycles
- Engine: Pwa PW4056
- System (JASC): [5714 · Wing, Center Box](https://openairdocs.org/jasc/5714)
- Part: Skin
- Condition: Corroded
- Location: Center Wing Tank
- 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/DALA1010936301

## Discrepancy

DURING L-CHECK FOUND CORROSION ON THE CTR WING TANK UPPER SKIN AT STA 1241, LBL 106. REPAIRED IAW ERA 480488-14AD SECTION I.  FOLLOW UP ACTION REQUIRED IAW SECTION II PRIOR TO ACCUMULATION OF 20,000 TOTAL CYCLES OR 100,000 TOTAL FLIGHT HOURS WHICHEVER OCCURS FIRST.

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