# SDR CALA2026071417747

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2026
- Submitted: July 14, 2026
- Operation: Air carrier
- Aircraft: [N78501](https://openairdocs.org/aircraft/N78501), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31602
- Aircraft time: 60,418 hours, 23,095 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Condition: Damaged
- 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/CALA2026071417747

## Discrepancy

LIGHTNING STRIKE DAMAGE LOCATED AT STATION 214 AND 7" BELOW FLOOR LINE STRINGER 17R. DAMAGE IS AWAY FROM FASTENER.BLENDED AREA REMOVED .017" OF MATERIAL ORIGINAL THICKNESS IS .040". BLEND IS OUT OF LIMITS. A REPAIR IS NEEDED FOR THIS AREA. REQUESTING A THICKNESS CHECK OF REMAINING MATERIAL. PERFORMED ULTRASOUND THICNESS TEST REF B737 NDT PT 4 51-00-00 PROC 2. ORIGINAL DAMAGE DIA WAS .037" PIN POINT REF PUTTING THIS OUT OF LIMITS IS 51-00-01 HFEC FOUND DAMAGE TO GO ALL THE WAY THROUGH THE SKIN.  BLEND AREA MEASURES 1.25" X 1.25".    BLENED AREA FAILED HFEC INSPECTION. CRACK INDICATION SHOWN. REF 737 NTM PT.6. 51-00-00 PROCEDURE 23. AND SRM 53-00-01-2R-38. TEST ACCOMPLISHED STEP 1 OF AVO ESC0501-09JUL2026-01 REQUESTING INSPECTION FOR GRID THICKNESS CHECK PER STEP 2 OF AVO. VERIFIED ESC HAS ALL REQUESTED  THICKNESS DATA AT THIS TIME. ACCOMPLISHED STEP 3 OF AVO 17835 REV A

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