# SDR NWAA072026739

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2007
- Submitted: May 30, 2007
- Operation: Air carrier
- Aircraft: N639US
- Make and model: Boeing 747251F
- Aircraft serial: 23887
- Aircraft time: 73,897 hours, 16,043 cycles
- System (JASC): [5322 · Fuselage Internal Mounting Structure](https://openairdocs.org/jasc/5322)
- Part: Tension Tie
- Condition: Cracked
- Location: Bs 820
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NWAA072026739

## Discrepancy

DURING "M" CHECK, FOUND CRACKS IN BS 820 TENSION TIE FRAME WEB FASTENER HOLES RH NR 4, NR 10 AND LT NR 4, NR 9,NR 10, NR 11 AND NR 13.  ALSO, FOUND ONE FASTENER HOLE CRACKED ON FAILSAFE CHORD ON S10A.  REPAIRED PER EA 209243 SECT I AND SECT II SECTION III AND IV REQUIRE INSPECTIONS AT 3000 CYCLE INTERVALS.

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