# SDR ASAA2025091561730

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 15, 2025
- Submitted: October 21, 2025
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 66,572 hours, 19,991 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Part number: 146A8123U25
- 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/ASAA2025091561730

## Discrepancy

AFT CARGO DOOR THRESHOLD HAS MULTIPLE AREAS OF CORROSION. GROUNDED - YES. REMOVED CORROSION ON AFT CARGO DOOR THRESHOLD LOWER SILL WEB FOUND TO BE OUT OF LIMITS IAW B737NG SRM 53-60-15-1A-1 FIG 103. REMOVED AND REPLACED THRESHOLD IAW B737NG SRM 51-40-02 + BAC DWG 146A8340 REV C ORIGINAL THICKNESS 0.050" MAT REMOVED 0.022" MAT REMAINING 0.028".

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