# SDR SWAA2021071687321

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 24, 2021
- Submitted: July 16, 2021
- Operation: Air carrier
- Aircraft: [N291WN](https://openairdocs.org/aircraft/N291WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32539
- Aircraft time: 46,653 hours, 27,739 cycles
- System (JASC): [5510 · Horizontal Stabilizer Structure](https://openairdocs.org/jasc/5510)
- Part: Stiffener
- Condition: Cracked
- Location: R/H Horiz. 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/SWAA2021071687321

## Discrepancy

R/H HOR. STAB AT INSPAR RIB ASSY NO. 4 AT STAB STA 120.30 STIFFENER NO. 2 WITH A CRACK ; / [01] CUT OUT DAMAGED AREA AT STIFFENER #2 PER SRM 55-10-09-2R-4; [02] PERFORMED ROTO INSP ON 8EA FASTENER HOLES AT STIFFENER#2 IAW B737 NDT P6 51-00-00 PROC.16; NO CRACKS <BR>TOOL USED NORTEC 600 BC:166316; [03] PERFORMED HFEC INSP ON CUT OUT AREA IAW B737 NDT P6 51-00-00 PROC.23; NO CRACKS <BR>TOOL USED NORTEC 600 BC:166316; [04] VERIFIED STEP 1; [05] ACCOMPLISHED GVI REF SRM 55-10-09-2R-4 STEP 4E. NO OTHERS DISCREPANCIES NOTED; [06] CHECKED ROUGHNESS FOR THE CUT EDGES; INITIAL AND REPAIRS PARTS. THEY ARE SMOOTHER OF 63 MICROINCHES RA; [07] ROUGHNESS KIT B/C 171854; [08] DRILLED ANGLE AND T DOUBLER AND FILLER ON RIB #4 STIFFENER #2 AT THE RIGHT HAND HORZ STAB. STA. 120.30 AS PER SRM 55-10-09 -2R-4;IFFENER NO. 2 IN REF SRM 55-10-09-2R-4 REPAIR 4 AND SRM 51-40-02.; [19] VERIFIED STEP 18

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