# SDR SWAA2022032170837

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 9, 2022
- Submitted: March 22, 2022
- Operation: Air carrier
- Aircraft: [N460WN](https://openairdocs.org/aircraft/N460WN), registered now
- Make and model: Boeing 737*
- Aircraft serial: 32464
- Aircraft time: 58,773 hours, 34,967 cycles
- System (JASC): [5511 · Horizontal Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5511)
- Part: Stiffener
- Condition: Cracked
- Location: L/H Horiz. Stab.
- Stage of operation: UK
- 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/SWAA2022032170837

## Discrepancy

L/H HOR. STAB INSPAR RIB NO. 4 AT (STAB STA 120.30) STIFFENER NO. 4 CRACKED / [01] CUT OUT DAMAGED SECTION ON RIB #4; VERTICAL STIFFENER #4; PER REF. B737 SRM 55-10-09-2R-4 REPAIR 4; FIG. 202; DETAIL 'A';[[12] LOCATED AND DRILLED NEW REPAIR PARTS KIT; PER REF. B737 SRM 51-40-05-0G-0 AND 55-10-09-2R-4; REPAIR 4;[13] VERIFIED STEP 12. OK TO TREAT AND PRIME REPAIR PARTS AND WEB.;[14] APPLIED ALODINE AND PRIMED ON RE WORKED AREAS; PER REF. B737 AMM 51-21-41-370-802 AND 51-21-72-370-804;[15] VERIFIED STEP 14. OK TO INSTALL REPAIR PARTS.;[16] INSTALLED HORIZONTAL STAB. MACHINE IN SPAR RIB STIFFENER REPAIR AT RIB # 4 STIFFENER # 4 ; PER REF 737 SRM 55-10-09-2R-4; AND APPLIED FILLET TO THE REPAIR PARTS PER REF 51-20-05-0G-0;[17] CORRECTION INSTALLED HORIZONTAL STAB. MACHINE IN SPAR RIB STIFFENER REPAIR AT RIB # 4 STIFFENER # 4 ; PER REF 737 SRM 55-10-09-2R-4; AND APPLIED FILLET SEALANT TO THE REPAIR PARTS PER REF 51-20-05-0G-0;[18] VERIFIED STEP 17.;[19] INSTALLED HORIZONTAL STAB. MACHINE IN SPAR RIB STIFFENER REPAIR AT RIB # 4 STIFFENER # 4 ; PER REF 737 SRM 55-10-09-2R-4; AND APPLIED FILLET SEALANT TO THE REPAIR PARTS PER REF 51-20-05-0G-0;[20] VERIFIED STEP 19.

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