# SDR UPS00434011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 24, 2000
- Submitted: October 13, 2000
- Operation: Air carrier
- Aircraft: [N691UP](https://openairdocs.org/aircraft/N691UP), registered now
- Make and model: Boeing 747121
- Aircraft serial: 19641
- Aircraft time: 95,273 hours, 22,812 cycles
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Doubler
- Condition: Cracked
- Location: Nlg Ww
- 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/UPS00434011

## Discrepancy

INSPECTION TYPE:C, NLG CRACK FOUND ON THE FWD LOWER CORNER STRUCTURE OF THE WHEEL WELL LT SIDE.  CRACK EXTENDS UNDER THE LOWER CHORD OF THE BULKHEAD.  CRACKS ARE PERMITTED IAW SB 747-53-2112 R3 IN UNDER SKIN DOUBLER.  PREVIOUS MODIFICATION ACCOMPLISHED IAW UPS EO B747-5330-0367 SECTION 6.

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