# SDR AALA202105144738

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 25, 2021
- Submitted: May 14, 2021
- Operation: Air carrier
- Aircraft: [N521UW](https://openairdocs.org/aircraft/N521UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3944
- Aircraft time: 39,389 hours, 14,301 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Threshold
- Part number: D5347560020400
- 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/AALA202105144738

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: CORRODED AREA AT CORROSION THRESHOLD SHEET AFT CARGO COMPARTMENT LOCATED AT FR 53, STR 38R. L = 0.695 INCHES, W = 0.519 INCHES, D = 0.022 INCHES. REPLACED THRESHOLD SHEET FRAME 55 FRAME 52A AFT CARGO COMPARTMENT PER SRM 51-72-11-911-001.

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