# SDR SWAA2023071761688

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 20, 2023
- Submitted: July 17, 2023
- Operation: Air carrier
- Aircraft: N417WN
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29822
- Aircraft time: 71,145 hours, 42,399 cycles
- System (JASC): [5510 · Horizontal Stabilizer Structure](https://openairdocs.org/jasc/5510)
- Part: Stiffener
- Part number: UNKNOWN
- Condition: Cracked
- Location: Zn 300 Stabilize
- 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/SWAA2023071761688

## Discrepancy

LEFT HORIZONTAL STABILIZER RIB 2ND STIFFENER IS CRACKED AT STAB STA 129.50<[01] REMOVED THE DAMAGED PART AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-4;[02] HFEC REQUEST ON THE CUT OUT EDGES; WEB AND EXISTING FASTENERS HOLES WITHIN THE REPAIR AREA TO ENSURE NO CRACKS EXIST.;[03] VERIFIED CORRECTION ACTION ITEM 1.;[04] HFEC INSPECTED CUTOUT AREA IAW 737 NDTM PART 6; 51-00-00 PROCEDURE 23.<BR>CRACK NOTED; MARKED LOCATION.<BR><BR>HFEC INSPECTED OPEN HOLES IAW 737 NDTM PART 6; 51-00-00 PROCEDURE 16.<BR>CRACKS NOTED; MARKED LOCATIONS.<BR><BR>EQUIP USED:<BR>-NORTEC 600 ID: ATS1465 CAL DUE: 09/23;[05] TRIMMED OUT THE DAMAGED PART OF THE LOWER FLANGE AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-5;[06] HFEC REQUEST ON THE CUT OUT EDGES OF THE LOWER FLANGE AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER TO ENSURE NO CRACKS EXIST.10] FABRICATED REPAIR PARTS (1) T-SECTION FROM 60-5872 7075 T76511 LOT# 1463618-1 (2) ANGLE FROM BAC 1490-2793 7075 T62 CLAD LOT# 1442205-1 (3) FILLER FROM 7075 T6 0.050' CLAD LOT# 1300812-1 (4) SHIM FROM 7075 T6 0.020' CLAD LOT# 1381332-1; APPLIED CHEMICAL CONVERSION COATING IAW SRM 55-10-09-2R-5 OK TO PRIME.;

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