# SDR ASAA2025032057459

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2025
- Submitted: April 23, 2025
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 37,855 hours, 11,929 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Transition Panel
- Part number: 143A7501192
- 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/ASAA2025032057459

## Discrepancy

FWD PIT R/H TRANSITION PANEL HAS SPOTS OF CORROSION FROM STA.500B TO 500L. GROUNDED - YES. REMOVED CORROSION IAW B737-900 SRM 53-00-53 ORIG. THICKNESS .040 REMOVED .020 REMAINING .020 FOUND TO BE OUT OF LIMITS IAW B737-900 SRM 53-00-53 T8224B 02/DEC/2025 LOCATED, DRILLED AND TREATED REPAIR PARTS IAW B737-900 SRM 53-00-53 ASSEMBLED AND INSTALLED REPAIR PARTS IAW B737-900 SRM 53-00-53 BAC DWG'S 143A7501 REV A, 143A7500 REV- AND 143A7505 REV-.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.