# SDR ASAA2020122833874

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 28, 2020
- Submitted: January 16, 2021
- Operation: Air carrier
- Aircraft: [N474AS](https://openairdocs.org/aircraft/N474AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40715
- Aircraft time: 21,105 hours, 6,713 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Transition Panel
- Part number: 146A750237
- Condition: Corroded
- Location: Aft Cargo
- 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/ASAA2020122833874

## Discrepancy

AFT CARGO COMPARTMENT FLOOR SUPPORT TRANSITION PANEL CORRODED FROM BS 727 BS 787 LBL 21.  GROUNDED-YES.  REMOVED DAMAGE ON AFT CARGO LT TRANSITION PANEL ORIGINAL THICKNESS 0.040, MATERIAL REMAINING 0.028.  REMOVED 0.012 AND FOUND TO BE OUT OF LIMITS, PER B737-900ER SRM 53-00-53-1A-2.  REPAIRED SECTION OF TRANSITION PANEL FROM BS 727B+8-BS787+14, PER B737-900ER SRM 53-00-53-2R-5.

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