# SDR CALA2026041315311

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2026
- Submitted: April 13, 2026
- Operation: Air carrier
- Aircraft: [N77559](https://openairdocs.org/aircraft/N77559), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67183
- Aircraft time: 9,852 hours, 3,332 cycles
- System (JASC): [5730 · Wing, Plate/Skin](https://openairdocs.org/jasc/5730)
- Part: Skin
- Part number: 112A4102713
- Condition: Deformed
- Location: Zone 500
- 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/CALA2026041315311

## Discrepancy

LEFT WING SKIN INWARD AND OUTWARD DEFLECTION BETWEEN WSTA 711 - WSTA 512 AROUND WING ACCESS PANELS AND FUEL VENT PANELS.IN ACCORDANCE WITH EC/RA 5725-01174 LOWER WING SKIN WAS VISUALLY INSPECTED FOR OIL CANNING, NICKS, GOUGES AND OTHER DAMAGE EXTER NALLY. NO DEFECTS WERE NOTED AND NO DEFORMATION OF WING ACCESS PANELS WAS NOTICED. WING SKIN INTERNALLY WAS VISUALLY INSPECTED FOR DAMAGE, NO DAMAGE WAS FOUND, ALSO THE INTERNAL SKIN WAS INSPECTED TO VERIFY NO DAMAGE EXTENDED UNDER RIB CHORDS/SHEAR TIES, STR-6 TO STR-8 LOWER FLANGE. NO DAMAGE WAS FOUND. AN HFEC WAS AC COMPLISHED ON ALL OF THE DEFORMATIONS INTERNALLY AND EXTERNALLY AND WITHIN 6 INCHES BEYOND THE DENTED / WRINKLED AREA. NO DEFECT ES WERE NOTED BY QUALITY CONTROL. A VISIUAL INSPECTION WAS ACCOM PLISHED ON RIBS 17-25 BETWEEN STR-6 AND STR-8 INCLUDING END FITT INGS. NO DAMAGE WAS NOTED. NO LOOSE FASTENERS WERE FOUND, NO SEAL CRACKS, ELONGATED FASTENEER HOLES OR DAMAGED OR LOOSE FA STENERS WERE FOUND. REFERENCE BAM NON ROUTINE 3253981 FOR ALL WORK ACCOMPLISHED.  PERMANENT REPAIR LT WING SKIN R & R C/W BY REPAIR TEAM. VERIFIED ALL WORK ACCOMPLISHED PER BOEING FRR1, FRR-2, FRR-3 AND FRR-4. APPROVED PER UAL EC/RA 5700-03990 AND 5700-03991.

---
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.