# SDR ASAA2025042157669

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 21, 2025
- Submitted: May 2, 2025
- Operation: Air carrier
- Aircraft: [N487AS](https://openairdocs.org/aircraft/N487AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44108
- Aircraft time: 32,319 hours, 9,921 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Part number: 146A8123
- 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/ASAA2025042157669

## Discrepancy

AFT PIT ENTRY HAS CORROSION ON SILL THRESHOLD THROUGH OUT. GROUNDED - YES. REMOVED CORROSION ON AFT PIT THRESHOLD WEB, ORIGINAL MATERIAL THICKNESS .050, REMOVED .027, REMAINING .023, FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-60-15-1A-1. REMOVED DAMAGED WEB,LOCATED AND DRILLED NEW WEB; PN: 146A8123-25 PO-11202658 AND INSTALLED WEB IAW B737-900ER SRM 51-40-02, SRM 51-40-05, AND BAC DWG 146A8340 REV: G.

---
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.