# SDR CALA2021032600370

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 24, 2021
- Submitted: March 26, 2021
- Operation: Air carrier
- Aircraft: [N73299](https://openairdocs.org/aircraft/N73299), registered now
- Make and model: Boeing 737824
- Aircraft serial: 34005
- Aircraft time: 46,407 hours, 16,566 cycles
- System (JASC): [5512 · Horizontal Stabilizer, Plate/Skin](https://openairdocs.org/jasc/5512)
- Part: Skin
- Part number: 182A4001
- Condition: Cracked
- Location: Horizontal Stab
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021032600370

## Discrepancy

2 CRACKS FOUND IN LT. HORIZONTAL STAB LOWER SKIN AT RIB STA 147. 90 AND 25"AND 32.5" FROM FWD SPAR(BOTH ITEMS CIRCLED AND CRACK M ARKED,VERIFIED WITH HFEC 737NDT PART 6 51-00-00-23) REPAIRED LT. LOWER HORIZONTAL SKIN STA 147.90 REF SRM 55-10-01 R EPAIR 11.SEE F/C L/P 9767418 FOR WORK ACCOMPLISHED.ISSUED DIP FO R INSP REQ-INSP THRESHOLD 56K CYCLES-DVI AND LFEC AT 9K INTERVAL REF 737 NDT PART 6 51-00-26 FIG 1.REF SRM 55-10-01 REPAIR 11 PA RA 5 TABLE 204 AND FIG 206. PLACED ON DIP. INSP REQ-INSP THRESHOLD 56K CYCLES-DVI AND LFEC AT 9K INTERVAL MORE REF 737 NDT PART 6 51-00-26 FIG 1.REF SRM 55-10-01 REPAIR 11 PA RA 5 TABLE 204 AND FIG 206. TOMC-APPROVAL FROM SC1ELBYC COMMENT VERIFIED REPAIRED PER SRM 55-10-01. RECORDS UPDATE Q/C REVIEWED. Q/C REVIEWED. INIT: 56K FC INIT(-2733) WILL ITO TO RIR RIR: 9K FC .....................DB/U359554

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