# SDR UIEA2010052400003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2010
- Submitted: May 25, 2010
- Operation: Air carrier
- Aircraft: [N408MC](https://openairdocs.org/aircraft/N408MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29261
- Aircraft time: 49,344 hours, 7,670 cycles
- Engine: Ge CF680C2B1F
- System (JASC): [5313 · Fuselage Main, Longeron/Stringer](https://openairdocs.org/jasc/5313)
- Part: Stringer
- Condition: Damaged
- Location: Bs 550 S31l
- 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/UIEA2010052400003

## Discrepancy

DAMAGE WAS FOUND TO THE 142U0086-198 STRINGER 31L AT BS 550 AFTER A BURST EQUIPMENT COOLING EXHAUST VALVE TRUCK THE S-31L STRINGER AND SKIN. REFER TO EO 4453A362 FOR THE SKIN REPAIR. THE 142U0086-198 STRINGER IS MADE FROM 0.050 INCH THICK 7075-0 SHEET PER QQ-A-250/12 HEAT TREATED TO T62 AFTER FORMING. IN THE AREA OF THE DAMAGE, STRINGER HAS A MACHINE TAPER 0.050 TO 0.040 INCH OVER 197 INCHES. PART 1 OF THIS EO ACCOMPLISHES THE TIME LIMITED REPAIR OF THE STRINGER. THE REPAIR IAW PART 1 OF THIS EO IS CATEGORY C AND REQUIRES REPETITIVE INSP IAW PART 2 OF THIS EO AT A-CHECK INTERVALS AND REPLACEMENT AT THE NEXT C-CHECK AFTER 24MAY2010 IAW PART 3 OF THIS EO. PART 2 OF THIS EO REPETITIVELY INSPECTS THE PART 1 REPAIR TO ENSURE CONTINUED AIRWORTHINESS. PART 3 OF THIS EO ACCOMPLISHES THE INTERIM REPAIR AT THE NEXT C-CHECK AFTER 24MAY2010 IAW SRM 53-00-03, FIGURE 201, REPAIR 3.

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