Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
July 15, 2021
Submitted
August 18, 2021
Operation
Air carrier
Aircraft
N444WN
Make and model
Boeing 7377H4
Aircraft serial
29839
Aircraft time
61,121 hours, 35,983 cycles
Part
Floorbeam
Condition
Corroded
Location
Bs 986 Rbl31-45
Stage of operation
IN
How discovered
V
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 ON FLOOR BEAM EXISTING REPAIR BS 986 RB L31-45 WL 208 ; / [01] BLENDED CORROSION ON FLOOR BEAM UPPER CHORD BS 986 RBL 31-RBL 45 WL 208 PER SRM 51-10-02. MAXIMUM MATERIAL REMOVED WAS 14'X1'X.045'. FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1.[11] INSTALLED T-CHORD ITEM 1(1EA) REPAIR ANGLE ITEM 2(2EA) REPAIR ANGLE ITEM 3(2EA) STRAP ITEM 4(2EA)R/H SHEAR TIE (1EA) ALL I.A.W SRM 53-70-51-2R-4; [12] LOCATED AND DRILLED NEW T-CHORD ITEM 1 P/N53100011-003 FABRICATED FROM SOUTHWEST KIT 7350799 ALL I.A.W SRM 53-70-51-2R-4 OK TO INSTALL REPAIR PARTS REPAIR ANGLE ITEM 2(2EA) REPAIR ANGLE ITEM 3(2EA) STRAP ITEM 4(2EA)R/H SHEAR TIE (1EA) ALL FABRICATED ON SOUTHWEST AIRLINES NRC 753-380-00-02/004; [13] UPDATED SHEAR TIE QTY.; [14] RII INSPECTED ACTION 12-13; [15] RII INSPECTED STEP 11; [16] REMOVED AND REPLACED DAMAGE SECTION OF EXISTING FLOOR BEAM REPAIR T-CHORD BS986 RBL20-RBL50 WL208 ALL I.A.W SRM SRM 53-70-51-2R-4.; [17] RII INSPECTED FINAL; [18] INSPECTION COMPLETE; [19] CORRECTING MEASUREMENT TABLE. ADDING FULL PART NUMBER TO MEASUREMENT #14.; [20] CERTIFIED CORRECTING MEASUREMENT TABLE. ADDING FULL PART NUMBER TO MEASUREMENT #14.

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