# SDR UIEA200400017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 2004
- Submitted: March 12, 2004
- Operation: Air carrier
- Aircraft: [N517MC](https://openairdocs.org/aircraft/N517MC), registered now
- Make and model: Boeing 747243B
- Aircraft serial: 23300
- System (JASC): [5410 · Nacelle/Pylon, Main Frame](https://openairdocs.org/jasc/5410)
- Part: Strut
- Condition: Cracked
- Location: Nr 1 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/UIEA200400017

## Discrepancy

DURING D-CHECK AT SIN, DURING ZONAL INSPECTION IT WAS DISCOVERED THAT NR 1 ENGINE PYLON STRUT PRECOOLER EXHAUST VENT HAD CRACKS ON THE RIGHT SIDE OF THE STRUT.  THE REPAIRS WERE MADE ON THE RIGHT SIDE OF THE STRUT STRUCTURE ASSEMBLY.  THE NR 3 STIFFENER WAS REINFORCED WITH A NEW LOWER REPAIR ANGLE FROM NAC STATION 235 TO STATION 254.  THE RIB INSTALLATION AT NAC STATION 248 WAS MODIFIED TO ACCOMMODATE THE NEW STEEL REPAIR ANGLES INSTALLATION ON THE NR 3 STIFFENER. (M)

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