# SDR SWAA2022071921707 - Type: Service difficulty report (as reported; unverified) - Difficulty date: June 22, 2022 - Submitted: July 19, 2022 - Operation: Air carrier - Aircraft: [N258WN](https://openairdocs.org/aircraft/N258WN), registered now - Make and model: Boeing 737-7H4 - Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs) - Aircraft serial: 32516 - Aircraft time: 52,954 hours, 31,553 cycles - System (JASC): [5511 ยท Horizontal Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5511) - Part: Rib - Condition: Cracked - Location: L/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/SWAA2022071921707 ## Discrepancy L/H HORIZONTAL STABILIZER MOVEABLE L/E FAIRING RIB 4 CRACKED @ EDGE MKD DOT / [01] PERFORMED HFEC INSP ON L/H HORIZ STAB MOVEABLE L/E FAIRING RIB#4 IAW B737 NDT P6 51-00-00 PROC.23; CRACK NOTED (CRACK LENGTH 0.250')
TOOL USED : NORTEC 600 B/C 172389 CALDUE: 03/23;[02] REMOVED RIB 4 AT L/H HORIZONTAL STABILIZER PER.REF. B-737-7 SRM 51-40-02-0G;[03] PERFORMED HFEC HOLE PROBE INSPECTION ON ALL REMOVED FASTENER LOCATIONS IAW NDTM PART 6; 51-00-00; PROCEDURE 16. NO CRACKS. [NORTEC 600 ; B/C 166316 ; CALIB.DUE- 10/22];[04] PERFORMED HFEC COUNTERSINK INSPECTION ON ALL REMOVED FASTENER LOCATIONS IAW NDTM PART 6; 53-30-00; PROCEDURE 3. NO CRACKS. [NORTEC 600 ; B/C 166316 ; CALIB.DUE- 10/22];[05] VERIFIED AND INSPECTED STEP#2.;[06] OK TO INSTALL RIB 4.;[07] REPLACED RIB #4 PN 186A1304-1 AT L/H HORIZ. STAB. L/E FAIRING PER B737-700 SRM 51-40-02-0G-0;[08] VERIFIED AND INSPECTED STEP#7;[09] MEASUREMENTS INPUT AND PARTS TRANSACTION ONLY;[10] VERIFIED STEP#9;[11] VERIFIED AND INSPECTED. --- 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.