Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
June 9, 2021
Submitted
July 22, 2021
Operation
Air carrier
Aircraft
N418WN
Make and model
Boeing 7377H4
Aircraft serial
29823
Aircraft time
65,911 hours, 38,694 cycles
Part
Floorbeam
Condition
Corroded
Location
Bs 986
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 BS 986.5 FLOOR BEAM UPPER SURFACE RBL 43; WL 208.1 ; / [01] OUT OF LIMITS DUE TO 100% MATERIAL LOSS; [04] REMOVED DAMAGE ON FLOOR BEAM AT BS 986.5 FROM RBL 30 TO RBL 52 WL208.1 IAW SRM 53-70-51-2R-4 REPAIR 4.; [05] CUT AND REMOVED DAMAGE FLANGES OF THE UPPER CHORD ON FLOOR BEAM AT BS 986.5 FROM RBL 30 TO RBL 52 WL208.1 IAW SRM 53-70-51-2R-4 REPAIR 4; [18] LOCATED AND DRILLED FLOOR BEAM REPAIR PARTS AT BS 986.5 FROM RBL 52 TO RBL 43; WL 208.1: (1) T-CHORD BAC1505-101474 #7075-T6511 LOT# 1382493-1; (2) 2EA BAC 1490-2811#7075-T6 LOT# 1440345-1 ; (3) 2EA BAC1490-2887#7075-T6 LOT# 1425362-1 AND (4) 2EA STRAPS FROM 7075-T6 CLAD SHEET 0.080'; IAW SRM 53-70-51-2R-4 REAIR 4. OK TO APPLY CHEMICAL CONVERSION COATING AND PRIMER.; [19] VERIFIED LOCATED AND DRILLED FLOOR BEAM REPAIR PARTS AT BS 986.5 FROM RBL 52 TO RBL 43; WL 208.1: (1) T-CHORD BAC1505-101474 #7075-T6511 LOT# 1382493-1; (2) 2EA BAC 1490-2811#7075-T6 LOT# 1440345-1 ; (3) 2EA BAC1490-2887#7075-T6 LOT# 1425362-1 AND (4) 2EA STRAPS FROM 7075-T6 CLAD SHEET 0.080'; IAW SRM 53-70-51-2R-4 REAIR 4.<BR>VERIFIED OK TO APPLY CHEMICAL CONVERSION COATING AND PRIMER.;

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