# SDR CALA2025122312367

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2025
- Submitted: December 23, 2025
- Operation: Air carrier
- Aircraft: [N13720](https://openairdocs.org/aircraft/N13720), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28939
- Aircraft time: 81,363 hours, 28,714 cycles
- System (JASC): [5711 · Wing Spar](https://openairdocs.org/jasc/5711)
- Part: Spar
- Part number: 112A21013
- Condition: Corroded
- Location: Zone 500
- 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/CALA2025122312367

## Discrepancy

FOUND CORROSION AT LT WING FRONT SPAR AT IFSS 120, BOOST PUMP LOCATION.   REPAIRED THE LT WING FRONT SPAR AT IFSS 120 BOOST PUMP LOCATION, IAW ECRA 5720-03588.

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