# SDR IPXA2026011955833

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2026
- Submitted: February 4, 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: Skin Panel
- Part number: 148N371087
- 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/IPXA2026011955833

## Discrepancy

APU BAY, INTERNAL STRUCTURE RT SIDE, BTWN BS 1885.2 & 1918.9, ALUMINUM HONEYCOMB SKIN HAD CORROSION.  TRIMMED OUT LOWER FWD SECTION OF HONEYCOMB ONLY ON SKIN BOND ASSY. PANEL TO REMOVE EXFOLIATED CORROSION, ACCOMPLISHED AND INSPECTION OF THE STRINGER AND SURROUNDING STRUCTURE IAW EA 757-5380-27-A4273, REV-, STEP 1.  TRIMMED DAMAGED OUTER SKIN ON BOND ASSY PANEL TO REMOVE REMAINING EXFOLIATION PER E.A# 757-5380-27-A4273 STEP 1. ENLARGE CUTOUT BY 0.040".   PERFORMED HFEC INSPECTION OF ALL 40 ACCESSED FASTENER HOLES, LOCATION COMMON TO THE DAMAGE AREA ON THE SKIN LAYER AND TITANIUM LAYER ONLY IAW EA 757-5380-27-A4273, STEP 5, PRELIMINARY 1. NO CRACK INDICATION NOTED AT THIS TIME.

---
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.