# SDR USAA991271

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 8, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N517AU
- Make and model: Boeing 737-3B7
- Registry model: [Boeing 737-3B7](https://openairdocs.org/model/boeing-737-3b7) (OpenAirDocs)
- Aircraft serial: 23703
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Stiffener
- Part number: BAC1498168
- Condition: Cracked
- Location: Bs 727e
- Part time: 40,758 hours
- 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/USAA991271

## Discrepancy

PIT - DURING OTHER REPAIR FOUND 3 CRACKS TOTALING 12.5 INCH W/2.5 INCH BY .5 INCH BROKENOUT AREA ON RADIUS.  CORROSION ON CONTACT SURFACE MOST OF LENGTH, LEVEL 1.  FOUND AT NR 3 COMM ANTENNA ATTACH POINT STIFFENER APPROX STATION 727E.  REMOVED CRACKED AND CORRODED STIFFENER CHANNEL.  MADE AND INSTALLED NEW STIFFENER EXTRUSION OF BAC 1498-168 7075-T6 MATERIAL PER 65-65 DWG AND SRM 53-00-01.  (M)

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