# SDR CALA2026052516518

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2026
- Submitted: May 25, 2026
- Operation: Air carrier
- Aircraft: [N76515](https://openairdocs.org/aircraft/N76515), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31623
- Aircraft time: 55,660 hours, 20,311 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Part number: 141A381610
- Condition: Damaged
- Location: Sta 255
- 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/CALA2026052516518

## Discrepancy

REF LOG PAGE 8761591 LIGHTNING STRIKE ON CROWN APPROX STA 235 BETWEEN STR 1R AND STR 2R EXCESSIVE MATERIAL WAS REMOVED FROM BLENDING REQUIRES REPAIRLAID OUT GRID LAID OUT GRID ULTRASOUND MEASUREMENTS ACCOMPLISHED UT INSPECTION OF BLENDED AREA AND PROVIDED MESSUREMENTS FOR GRID ADDED PHOTO AVO 17431 REMOVED FASTENERS IN DAMAGE AREA. BLENDED OUT DAMAGE 20:1 RATIO. CLEANED FASTENER HOLES. LAYED OUT 1/4 INCH GRID. READY FOR NDT REF AVO17431 ACCOMPLISHED NDT MEASUREMENTS AND MAP OUT REF AVO17431.. MEASUREMENTS FOR ULTRASONIC INSPECTION AND SENT READING TO ENGINEER FOR FURTHER STEPS. STARTED REMOVING FASTENERS FOR DOUBLER REF AVO17433  REV A STEP 7. CONTINUED REMOVING FASTENERS FOR DOUBLER REF AVO17431  REV A. REMOVED REMAINING LOCK FASTENERS IN REPAIR AREA. CLEANED OPEN HOLES. READY FOR NDT REF AVO17431 REV A. ACCOMPLISHED OPEN  HOLES HFEC INSPECTION OF INITIAL HOLES AND COUNTER SINKS PER AVO 17431 REV.  A, STEPS 8 AND 9- NO DEFECTS FOUND. TRANSFERED ALL FASTENER HOLES TO REPAIR DOUBLER  REF. AVO 17431 REV.A. MADE MAP FOR NON-PRODUCTION FASTEERS ON DOUBLER AND DRILLED NON-PRODUCTION FASTENERS INTO DOUBLER AND AIRCRAFT. BEGAN TO COUNTERSINK FASTENER HOLES ON DOUBLER REF AVO017431 COMPLETED COUNTERSINKING AND CHAMFERING DOUBLER REF AVO 17431 REV A.  FABRICATED REPAIR DOUBLER, INSTALLED COUNTERSINK REPAIR WASHERS, REF. AVO 017431 REV.A, CLEARANCE TO INSTVERIFIED ALL WORK ACCOMPLISHED PER ECRA 5310-08915.

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