# SDR SWAA2023031301717

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2023
- Submitted: March 13, 2023
- Operation: Air carrier
- Aircraft: [N277WN](https://openairdocs.org/aircraft/N277WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32531
- Aircraft time: 51,901 hours, 31,206 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Condition: Corroded
- Location: Zn 200 Fus Top
- 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/SWAA2023031301717

## Discrepancy

MAIN CABIN AFT WET AREA FLOOR WEB CORROSION AT LBL 7' STA 1060+11' MAIN CABIN AFT WET AREA FLOOR WEB CORROSION AT LBL 7' STA 1006+11'<[01] FOUND EXFOLIATING CORROSION TO BE OUT OF LIMITS REF SRM 51-70-15-1A-1. PART NEEDS REPLACEMENT.;[02] REMOVED FLOOR WEB AT MAIN CABIN AFT WET AREA AT STA 1060+11' AND LBL 7' REF SRM 51-40-02-0G-0;[03] LOCATED; DRILLED AND COUNTERZUNK HOLES AT AFT WET AREA NEW FLOOR WEB REF 51-40-05-0G-0;[04] VERIFIED STEPS 1;2;3;[05] OK TO INSTALL WEB.;[06] PARTIALLY INSTALLED NEW FLOOR WEB AT MAIN CABIN AFT WET AREA AT STA 1060+11' AND LBL 7' REF SRM 51-40-02-0G-0 AND DWG 147A5600.<BR><BR>SEALANT INFORMATION: MIXED TIME 17:00PM 02-17-2023; APPLIED SEALANT TIME 18:30PM 02-17-2023 AND SQUEZZE TIME 01:00AM 02-21-2023;[07] INSTALLED NEW FLOOR WEB AT MAIN CABIN AFT WET AREA AT STA 1006+11' REF SRM 51-40-02-0G-0 AND DWG 147A5600.;[08] CORRECTION STEP 2: REMOVED FLOOR WEB AT MAIN CABIN AFT WET AREA AT STA 1006+11' AND LBL 7' REF SRM 51-40-02-0G-0;[09] CORRECTION STEP 6: PARTIALLY INSTALLED NEW FLOOR WEB AT MAIN CABIN AFT WET AREA AT STA 1006+11' AND LBL 7' REF SRM 51-40-02-0G-0 AND DWG 147A5600.<BR><BR>SEALANT INFORMATION: MIXED TIME 17:00PM 02-17-2023; APPLIED SEALANT TIME 18:30PM 02-17-2023 AND SQUEZZE TIME 01:00AM 02-21-2023;[10] VERIFIED STEPS 7 AND 8. CORRECTION TO STEPS 2 AND 6.;[11] VERIFIED STEPS 6 AND 7. INSTALLATION OF THE NEW FLOOR WEB.

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