# SDR UPS07450581

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2007
- Submitted: September 4, 2007
- Operation: Air carrier
- Aircraft: N521UP
- Make and model: Boeing 747-200
- Registry model: [Boeing 747-200](https://openairdocs.org/model/boeing-747-200) (OpenAirDocs)
- Aircraft serial: 21944
- Aircraft time: 79,715 hours, 18,925 cycles
- System (JASC): [5411 · Nacelle/Pylon, Frame/Spar/Rib](https://openairdocs.org/jasc/5411)
- Part: Rib
- Condition: Cracked
- Location: Nr 3 Pylon
- 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/UPS07450581

## Discrepancy

INSPECTION TYPE:C NR 3 PYLON REAR ENG MOUNT BULKHEAD ATTACHMENT ENG MOUNT BULKHEAD ATTACHMENT UPPER LINK BEAM O/B & I/B SIDE RIB ANGLE FOUND CRACKED (NAC STA 227.4) FWD SIDE (CRACK LENGTH .375 INCH & 1 INCH).  NR 3 PYLON REAR ENG MOUNT BULKHEAD ATTACHMENT ENG MOUNT BULKHEAD UPPER LINK BEAM O/B SIDE RIB ANGLE REPAIRED AS PER SRM 54-14-03 FIG 13 AND O/B SIDE RIB ANGLE REPAIRED AS PER HX RS R54-51-35857 REPEAT INSP IS REQUIRED PER HX RS R54-51-35857 AND UPS EO B747-5410-27513.

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