# SDR IPXA2025050948569

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2025
- Submitted: May 14, 2025
- Operation: Air carrier
- Aircraft: [N447UP](https://openairdocs.org/aircraft/N447UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 27736
- Aircraft time: 35,880 hours, 20,372 cycles
- System (JASC): [5512 · Horizontal Stabilizer, Plate/Skin](https://openairdocs.org/jasc/5512)
- Part: Skin
- Part number: 185N30031
- Condition: Dented
- Location: Zone 300
- 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/IPXA2025050948569

## Discrepancy

*** MAJOR REPAIR *** 3EA DENTS ON LH HORIZONTAL STAB UPPER SKIN AT APROXIMATELY FS STA 90. DOT 21-18. REPAIR IAW: 757-200PF SRM REV 122 CHAPTER 51-70-10-2R-2, 250 DEG. F CURE PER SRM DETAIL III PER SRM 55-10-01-1A-1. UPPER SKIN OF LH HORIZONTAL STABILIZER UPPER SKIN PANEL BONDED ASSY HAS 3 EACH DENT DAMAGES. DENT #1 DIMENSION: DIAMETER = 0.90 INCH. DENT #2 DIMENSION: DIAMETER = 0.35 INCH. DENT #3 DIMENSION: DIAMETER = 0.50 INCH. DENT #1 WAS NOTED WITH DELAMINATION DAMAGE. UPPER SKIN PANEL P/N: 185N3003-1. ORIGINAL MAT.: 0.100 INCH THICK, 7075-T6 CLAD SH. UPPER SKIN PANEL BONDED ASSY. P/N: 185N3001-51. THIS IS A CATEGORY A REPAIR PER SRM 51-00-06.

---
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.