# SDR ASAA2025020756443

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2025
- Submitted: March 11, 2025
- Operation: Air carrier
- Aircraft: [N520AS](https://openairdocs.org/aircraft/N520AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36481
- Aircraft time: 49,914 hours, 17,596 cycles
- System (JASC): [5511 · Horizontal Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5511)
- Part: Rib
- Condition: Cracked
- 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/ASAA2025020756443

## Discrepancy

REQ'S ACCESS @ STA 111.10 FOR 4(EA) CRACKS IN RIB, REPAIR 11 REQUIRED. GROUNDED - YES. REMOVED EXISTING REPAIR CUTOUT HORIZONTAL SKIN FOR ACCESS, ACCOMPLISHED HFEC OF CUTOUT, CLEANED EXISTING REPAIR HOLES, ACCOMPLISHED OPEN HOLE HFEC, FABRICATED AND INSTALLED REPAIR PARTS IAW B737-800 SRM 55-10-01-2R-11, B737 NDTM PART 6 51-00-00 PROCESS 23 & 16 BOEING SOPM 20-30-03. THIS IS A CATEGORY B REPAIR, INSPECTION THRESHOLD IS 56.000 TOTAL FLIGHT CYCLES, METHOD IS EXTERNAL LOW FREQUENCY EDDY CURRENT INSPECTION, INTERVAL IS 9,000 FLIGHT CYCLES REFERENCE B737 NDT PART 6 51-00-26, FIG 1.

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