# SDR CALA2021082701444

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2021
- Submitted: August 27, 2021
- Operation: Air carrier
- Aircraft: [N87512](https://openairdocs.org/aircraft/N87512), registered now
- Make and model: Boeing 737824
- Aircraft serial: 33458
- Aircraft time: 43,456 hours, 15,187 cycles
- System (JASC): [5512 · Horizontal Stabilizer, Plate/Skin](https://openairdocs.org/jasc/5512)
- Part: Skin
- Condition: Cracked
- Location: Horizontal Stab
- 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/CALA2021082701444

## Discrepancy

SUPPORT TASK. C-SCAN, CRACK INDICATION, RH LWR HORIZONTAL STABIL IZER SKIN, STAB STA 120.3. APPROX. 24" FWD OF REAR STAR. REF TO PEMCO NR 11101.0162. CRACK LOCATED AT RH H-STAB LWR SKIN STA 123.85 APPROX. 4FT FROM LE. ORIG SKIN THICKNESS = .071" CUTOUT DIMENSIONS = 1.0"X 1.3". HFEC PERFORMED IAW 737 NDT PT6 51-00-00 AND 51-10-01. DOUBLER  REPAIR INSTALLED IAW SRM 53-10-01-2R-11. DOUBLER MEASURES 11"X18.5". CAT B REPAIR, REPEAT INSPECTIONS REQUIRED IAW SRM 53-10-01-2R-11 AND 737NDT PT 6 51-00-26 BEGINNING AT 56000 TOTAL FC AND EVERY 9000 FC THEREAFTER. TOMC APPROVED DIP TO ACCOMPLISH DETAILED VISUAL INSPECTION AND EXTERNAL LFEC INSPECTION OF CATEGORY B REPAIR STARTING AT INSPECTION THRESHOLD 56,000 TOTAL FLIGHT CYCLES AND REPEAT INSPECTIONS EVERY 9,000 FLT CYCLES THEREAFTER, REF SRM 55-10-01-2R-11 REPAIR 11 SECTION 5. TABLE 204. T

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