# SDR CALA2025060305229

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2025
- Submitted: June 3, 2025
- Operation: Air carrier
- Aircraft: [N78501](https://openairdocs.org/aircraft/N78501), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31602
- Aircraft time: 57,233 hours, 21,580 cycles
- System (JASC): [5512 · Horizontal Stabilizer, Plate/Skin](https://openairdocs.org/jasc/5512)
- Part: Skin
- Part number: 182A4001
- Condition: Cracked
- Location: Zone 300
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025060305229

## Discrepancy

ONE CRACK SIGNAL NOTED L=0.600INCH APROX. AT STAB RH SIDE STA147.90 AND 8.500 INCH FROM FWD SPAR.   PERFORMED REPAIR AT STAB RH SIDE STA 147.90 ABD 8.500 INCH FROM FWD SPAR IAW SRM 51-40-02-0G-0,SRM-55-10-01-2R-11,SRM 51-10-02-0 G-0, NDT PART 6, 51-00-00 PROCEDURE 23 AND SOPM 20-30-03 THIS RE PAIR IS A CATEGORY "B" REPAIR AND REUIRE REPTETITIVE INSPECTIONS ADD EMP:V947261 , INSPECTION THRESHOLD 56,000 TOTAL FLIGHT CYCLES, REPEAT INSECT IONS INTERVAL 9,000 FLIGHT CYCLES IAW SRM 55-10-01-2R-11 STEP (5 ) INSPECTION REQUIREMENTS TABLE 204. INSPECTION APPROVED REPAIR IAW SRM 55-10-01-2R-11 IS A CATEGORY B REPAIR WITH AN INS PECTION THRESHOLD OF 56,000 TOTAL FLIGHT CYCLES. CURRENT FC'S = 21,579. INSPECTION METHOD: DETAILED VISUAL INSPECTION TO THE EXT ERNAL DOUBLER AND EXTERNAL LOW FREQUENCY EDDY CURRENT REF. 737 N DT PART 6, 51-00-26, FIGURE 1. LFEC INSPECT THE SKIN UNDER THE E XTERNAL DOUBLER AND INSPECT THE SPAR CHORD UNDER THE EXTERNAL DOUBLER. REPEAT INSPECTIONS REQUIRED EVERY 9,000 FLIGHT CYCLES. REPAIR PERFORMED ON RH STABILIZER AT STA 147.90 AND 8.5 INCHES FROM FWD SPAR IAW SRM 55-10-01-2R-11. IAW SRM 55-10-01-2R-11 PART 5 TABLE 204

---
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.