# SDR IPXA2026013056128

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2026
- Submitted: February 2, 2026
- Operation: Air carrier
- Aircraft: [N411UP](https://openairdocs.org/aircraft/N411UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23851
- Aircraft time: 39,473 hours, 26,446 cycles
- System (JASC): [4910 · APU Cowling/Containment](https://openairdocs.org/jasc/4910)
- Part: Longeron
- Part number: 148N82018
- 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/IPXA2026013056128

## Discrepancy

APU BAY, INTERNAL STRUCTURE RT LONGERON, BS 1885.2 CORRODED.  REMOVED CORROSION ON THE RT APU LONGERON, ORIGINAL THICKNESS 0.050", MATERIAL REMOVED 0.008".  INSTALLED NEW LONGERON,  SERVICABLE SEAL RETAINER, SERVICABLE SUPPORT PLATES, SERVICABLE HINGE ASSY,  SERVICABLE FRAME, SERVICABLE STIFFENERS, SERVICABLE GUSSET ASSEMBLIES, AND  SERVICABLE CHANNEL ASSEMBLIES IAW SRM 51-40-02-OG.

---
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.