# SDR CALA2026041715454

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 10, 2026
- Submitted: April 17, 2026
- Operation: Air carrier
- Aircraft: [N78511](https://openairdocs.org/aircraft/N78511), registered now
- Make and model: Boeing 737824
- Aircraft serial: 33459
- Aircraft time: 57,601 hours, 20,809 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Part number: 141A372134
- 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/CALA2026041715454

## Discrepancy

POSSIBLE LIGHTNING STRIKE DAMAGE AT STATION 221 APROX 16 INCHES ABOVE THE LAP SEAM ON FO SIDEBEGAN LAYING OUT FASTENERS IN RELATION TO DAMAGE. DOES NOT QUALIFY FOR DRILL OUT REPAIR AS IT DOES NOT MEET REQUIREMENT 1 D 1 F OF SRM 53-00-01-2R-38,  NOT MORE THAN 4D FROM A PRODUCTION FASTENER. WILL NEED ACCESS TO INSIDE TO FURTHER EVALUATE. THIS WILL REQUIRE REMOVAL OF ELECTRONIC COMPONANTS.SEE NEXT UPDATE FOR PICTURES. PIC ADDED DUCTING WILL NEED REMOVED IN THE FWD EQUIPMENT BAY R/H SIDE FOR ACCESS REMOVED COCKPIT COOLING AIR DUCT ON RIGHT SIDE FOR ACCESS TO DAMAGE. IAW AMM 21-00. DMGE WAS PREVIOUSLY BLENDED DOWN TO 0.038", DAMAGE REQUIRES THICKNESS CHECK PERFD THICKNESS  CHECK AS REQUESTED FOR LOCATION AT STATION 221 , APPROX 16 INCHES ABOVE LAP SEAM ON FO SIDE AS PER ENGINEERING REQS , SUBMITTED MEASUREMENTS TO ENGINEERING ALL IAW 737 NDT PART 4 51-00-00 PRO 2. LAID OUT A LARGER GRID (2 INCH) PER ENGINEERING REQUEST FOR REMAINING SKIN THICKNESS VERIFICATION REF SRM  53-00-01-2R-38. AVO ISSUED FOR THIS AREA, AVO 17113 COMPLIED WITH STEP 9 OF AVO 17113. REMOVED PAINT AROUND BLENDOUT TO ACCOMODATE A LARGER GRID PER ENGINEERING REQUEST TWO OUT OF THREE REQUIRED AREAS. REMOVED PAINT TO AQUIRE A LARGER GRID AREA PER ENGINEERING ON FINAL NEEDED AREA COMPLIED WITH STEP TA

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