# SDR UIEA01083

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2001
- Submitted: August 24, 2001
- Operation: Air carrier
- Aircraft: [N506MC](https://openairdocs.org/aircraft/N506MC), registered now
- Make and model: Boeing 747-2D3B
- Registry model: [Boeing 747-2D3B](https://openairdocs.org/model/boeing-747-2d3b) (OpenAirDocs)
- Aircraft serial: 21252
- System (JASC): [5400 · Nacelle/Pylon Structure](https://openairdocs.org/jasc/5400)
- Part: Angle
- Part number: 322U00004
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA01083

## Discrepancy

DURING INSPECTION FOUND NR 4 PYLON REAR ENGINE MOUNT OUTBOARD UPPER BULKHEAD ANGLE CRACKED AT FIRST FASTENER COMMON TO THE CENTER LINE OF PYLON.  PYLON HAS KIN CAP IN PLACE (PCW). TRIMMED AWAY CRACKS.  FABRICATED STRAP AND ANGLE.  OVERSIZED EXISTING HOLES IN REPAIR AREA AND INSTALLED PARTS PER STANDARD PRACTICES REPLACING EXISTING COLLARS WITH STEEL COLLARS RELATED TO STEEL PARTS AND ALUMINUM COLLARS RELATED TO ALUMINUM OR TITANIUM PARTS.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.