# SDR CALA2021110402035

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 2021
- Submitted: November 5, 2021
- Operation: Air carrier
- Aircraft: [N72405](https://openairdocs.org/aircraft/N72405), registered now
- Make and model: Boeing 737900
- Aircraft serial: 30122
- Aircraft time: 56,894 hours, 23,294 cycles
- System (JASC): [5500 · Empennage Structure](https://openairdocs.org/jasc/5500)
- Part: Skin
- Part number: 182A4001
- Condition: Cracked
- Location: Sta 138.7
- 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/CALA2021110402035

## Discrepancy

RH HORIZ STAB LOWER INSPAR SKIN CRACKED AT STA 138.7 DIRECTLY AC ROSS FROM DRAIN HOLE.CRACK IS APPROX .500 IN LENGTH(ENDS OF CRAC K VERIFIED WITH EDDY CURRENT AND MARKED) REPEAT INSPECTIONS-DVI 9000 FLIGHT CYCLES AND EXTERNAL LFEC 9000 FLIGHT CYCLES REF 737NDT PART 6,51-00-26 FIG 1. REPAIRED STAB INSPAR SKIN STA 138.7 REF SRM 55-10-01-2R-11.SEE F /C L/P 9786939 FOR WORK PERFORMED.ISSUED DIP FOR INSP REQUIREMEN TS AS FOLLOWS(INSPECTION THRESHOLD 56000 TOTAL FLIGHT CYCLES. VERIFIED REPAIRED STAB INSPAR SKIN STA 138.7 REF SRM 55-10-01-2R-11.SEE F /C L/P 9786939 FOR WORK PERFORMED.ISSUED DIP FOR INSP REQUIREMEN TS AS FOLLOWS(INSPECTION THRESHOLD 56000 TOTAL FLIGHT CYCLES.

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