Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
November 28, 2023
Submitted
January 12, 2024
Operation
Air carrier
Aircraft
N8310C
Make and model
Boeing 7378H4
Aircraft serial
38807
Aircraft time
38,174 hours, 17,675 cycles
Part
Floorbeam
Part number
UNKNOWN
Condition
Corroded
Location
Zn 100 Fus Lower
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CORROSION AT AFT CABIN WET AREA FLOOR SUPPORT BEAM FASTENER HOLE STA 986.5 LBL 42 MKD DOT<[01] INSTALLED REPAIR AT FLOOR BEAM STA.986.5 LBL 42 AS PER REF SRM 53-70-51-2R-6 REPAIR 6.;[02] CORRECTION SUMMARY TO READ REMOVED CORROSION AT AFT CABIN WET AREA FLOOR SUPPORT BEAM FASTENER HOLE STA 986.5 LBL 42 AS PER SRM 51-10-02-0G-0.ORIGINAL MATERIAL 0.150' MATERIAL LOST 0.097' MATERIAL REMAINING 0.053' FOUND OUT OF LIMITS AS PER SRM 53-70-51-1A-1 FIGURE 104 DETAIL FABRICATED REPAIR ANGLE; FILLER AND SHIM AS PER B 737 SRM 53-70-51-2R-6; REPAIR 6; SRM-51-40-05-0G-0 AND SRM 53-70-51-2R-6 REPAIR 6 WORK ACCOMPLISHED BY J.R 17210TREATED AND PRIMED REPAIR ANGEL FILLER AND SHIM AS PER INSTALLED REPAIR WITH 100% SQUEEZE OUT AT FLOOR BEAM STA.986.5 LBL 42 AS PER REF SRM 53-70-51-2R-6 REPAIR 6.SEALANT USED BMS 5-95 870 C20 MIX TIME 12/7/2023 6:00 PM APPLICATION TIME 12/7/2023 6:15 PM SQUEEZE OUT TIME BY 12/8/2023 2:00 PM B 737-700 AMM 51-00-58-201 AND AMM 51-21-72-370-802 WORK ACCOMPLISHED BY J.R 17210 APPLIED FILLET SEAL TO REPAIR AT FLOOR BEAM STA.986.5 LBL42 AS PER REF SRM 53-70-51-2R-6 REPAIR 6 AND SRM 51-20-05-0G-0 APPLIED CIC AT STA 986.5 LBL 42 AS PER REF AMM 25-27-21-400-801;[03] ALL STEPS COMPLETED. VERIFIED STEPS#1 AND #2. INSTALLED REPAIR AT FLOOR BEAM STA.986.5 LBL 42.

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