# SDR SWAA2021071984791

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 15, 2021
- Submitted: July 19, 2021
- Operation: Air carrier
- Aircraft: [N489WN](https://openairdocs.org/aircraft/N489WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33855
- Aircraft time: 54,253 hours, 32,244 cycles
- System (JASC): [5510 · Horizontal Stabilizer Structure](https://openairdocs.org/jasc/5510)
- Part: Stiffener
- 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/SWAA2021071984791

## Discrepancy

LT HORIZ. STAB RIB #5 (STAB STA 129.3) #4 VERT STIFFENER IS CRACKED. ; / [01] REMOVED DAMAGE (CRACK) ON STAB RIB (STAB STA 129.3) #4 VERT STIFFENER; L=2.30' X W=0.60' IAW SRM 55-10-09-2R-5. REQUIES NDT TO VERIFIY CRACK FREE.; [02] VERIFIED REMOVED DAMAGE (CRACK) ON STAB RIB (STAB STA 129.3) #4 VERT STIFFENER; L=2.30' X W=0.60' IAW SRM 55-10-09-2R-5. REQUIES NDT TO VERIFIY CRACK FREE.; [03] ET INSPECTED CUT OUT AND HOLES IN REPAIR IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23 AND PROCEDURE 16; NO CRACKS NOTED.<BR><BR>CAL ID IS000450 N500D; [04] -PERFORMED A GENERAL VISUAL INSPECTION OF ALL AREAS WITHIN THE REPAIR AREA IAW SRM 55-10-09-2R-5 STEP 4 F. NO DISCREPANCIES FOUND.[09] REPAIRED LT HORIZONTAL STAB; #5 RIB (STAB STA 129.3); #4 STIFFENER IAW SRM 55-10-09-2R-5; [10] VERIFIED REPAIR INSTALLATION ON STAB RIB;

---
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.