# SDR CALA2026090919315

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 26, 2026
- Submitted: September 9, 2026
- Operation: Air carrier
- Aircraft: [N78540](https://openairdocs.org/aircraft/N78540), registered now
- Make and model: Boeing 737824
- Aircraft serial: 63646
- Aircraft time: 27,628 hours, 10,398 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Part number: 654A000358
- 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/CALA2026090919315

## Discrepancy

FWD CARGO, LOWER MAIN SILL WEB HAD TWO POINTS OF POSSIBLE CORROSION.   REMOVED THE FWD CARGO LOWER MAIN SILL WEB, LOCATED, DRILLED, COUNTERSANK, APPLIED ALODINE, PRIMER, INSTALLED NUTPLATES AND INSTALLED NEW WEB IAW SRM 53-30-15-1A-1, SRM 51-10-02-0G-0, SRM 51-40-02-0G-0, SRM 51-40-05-0G-0, SRM 51-40-08-0G-0, SRM 51-20-01-0G-0, AMM 51-21-72-370-804, & DWG 143A8122, REV. D.

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