Service difficulty report · Threshold · Boeing 73776N

Difficulty date
June 6, 2023
Submitted
June 29, 2023
Operation
Air carrier
Aircraft
N7811F
Make and model
Boeing 73776N
Aircraft serial
28654
Aircraft time
58,393 hours, 34,757 cycles
Part
Threshold
Condition
Cracked
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

AFT CARGO BAY AFT CORNER THRESHOLD IS CRACKED<[01] WELDED CRACKED RADIUS OF AFT CARGO DOOR AFT CORNER SCUFF PLATE USING ER4043 FILLER ROD LOT NUMBER 1131216 PER SRM 53-60-15-2R-1 REPAIR 1 PARA 4.B. (2) AND (4)<BR>EQUIPMENT USED: WELDING MACHINE E10583; CALIBRATION DUE DATE 01/2024;[02] VERIFIED CORRECTIVE ACTIONS 1; APPLICABILITY OF SRM 53-60-15-2R-1; AND MEASUREMENT TABLE;[03] PT INSPECTED AREA IAW SOPM 20-20-02. <BR>NO CRACKS NOTED. <BR>EQUIP USED: <BR>-RADIOMETER ID: ATS2561-1; 2; 3 CAL DUE: 08/23;[04] SANDED REPAIR WELD AREA PER SRM 53-60-15-2R-1 REPAIR 1 PARAGRAPH 4.B.(5);[05] VERIFIED CORRECTIVE ACTION 4;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW SRM 53-60-15-2R-1 STEP (6) (7);[07] VERIFIED CORRECTIVE ACTIONS STEP 6.

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