# SDR SWAA2023042721042

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2023
- Submitted: April 27, 2023
- Operation: Air carrier
- Aircraft: [N8529Z](https://openairdocs.org/aircraft/N8529Z), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 36974
- Aircraft time: 19,992 hours, 9,666 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- 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/SWAA2023042721042

## Discrepancy

CORROSION ON BS 986 FLOOR BEAM; LBL 44; WL 208; AROUND NUTPLATE HOLE.<REMOVED CORROSION ON BS986 LBL44 WL 208 AROUND THE NUTPLATE HOLE ORIGINAL MATERIAL THICKNESS IS 0.150' REMAINING MATERIAL THICKNESS IS 0.120' DAMAGE TO BE FOUND OUT LIMITS I.A.W SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1 PAR 4.D(2)(A) FIG104/ALLOWABLE DAMAGE 1 DETAIL E <BR>TOOL USED <BR>ATS1671<BR>S/N 65093024<BR>DUE 07/2023<BR>ATS2472<BR>DUE 12/31/2023;[04] OUT LIMIT DAMAGE ON BS 986 FLOOR BEAM; LBL 44; WL 208; AROUND NUTPLATE HOLE TO BE REPAIRED PER SRM 53-70-51-2R-6 REPAIR 6 ALTERNATIVE 3 FABRICATED; LOCATED; DRILLED; APLLIED FLAP PEENING; CHEMICAL CONVERSION COATING AND PRIMER ON REPAIR PARTS AND REPAIR AREA DOUBLER 1EA MATERIAL USED 7075 T6 CLAD 0.100' LOT# 1489800-1 FILLER 1EA MATERIAL USED 7075 T6 CLAD 0.032' LOT#1430478-4 IAW SRM 53-70-51-2R-6 REPAIR 6 ALTERNATIVE 3 TOOL USED E8288 DUE DATE 10/2023. INSTALLED REPAIR PARTS; SEALING AROUND REPAIR AND APPLIED CIC ON REPAIR AREA IAW SRM 53-70-51-2R-6 REPAIR 6 ALTERNATIVE 3.

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