# SDR CALA2026100520085

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 2026
- Submitted: October 5, 2026
- Operation: Air carrier
- Aircraft: [N77578](https://openairdocs.org/aircraft/N77578), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67613
- Aircraft time: 10,020 hours, 3,263 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Intercostal
- Part number: 147A758035
- Part serial: NSN
- Condition: Corroded
- Location: Zone 100
- 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/CALA2026100520085

## Discrepancy

FOUND CORROSION AFT OF AFT CARGO COMPARTMENT BILGE SUPPORT INTERCOSTAL BETWEEN BS 927 & 947.75, S27L  REMOVED & REPLACED INTERCOSTAL AT BS 927 AND 947, S27L IAW SRM 51-40-02-0G-0, AND DRAWING 147A7500.

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