Service difficulty report · Threshold · Boeing 7378H4

Difficulty date
May 17, 2023
Submitted
June 16, 2023
Operation
Air carrier
Aircraft
N8535S
Make and model
Boeing 7378H4
Aircraft serial
63596
Aircraft time
19,603 hours, 9,695 cycles
Part
Threshold
Part number
UNKNOWN
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

FORWARD CARGO BAY AFT CORNER THRESHOLD IS CRACKED<[01] WELDED CRACKED RADIUS ON FWD CARGO BAY AFT CORNER SCUFF PLATE USING ER4043 FILLER ROD LOT NUMBER 1131216 PER SRM 53-30-15-2R-1 REPAIR 1 PARAGRAPH 4.B.(2) AND (4)<BR>EQUIPMENT USED: WELDING MACHINE E10583; CALIBRATION DUE DATE 01/2024;[02] VERIFIED CORRECTION ACTION ITEM 1;[03] DYE PENETRANT INSPECTED WELDED AREA PER SOPM 20-20-02. NO DEFECTS NOTED. EQUIP USED. DLM-1000 RADIOMETER; ID# ATS2561; CAL DUE: 08/31/2023;[04] SANDED REPAIR AREA PER SRM 53-30-15-2R-1 REPAIR 1 PARAGRAPH 4.B.(5);[05] VERIFIED CORRECTION ACTION ITEM 4;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER TO REPAIRED AREA PER SRM 53-30-15-2R-1 STEP 4B (6) AND (7);[07] VERIFIED CORRECTIVE ACTIONS STEP 6.;[08] VERIFIED MEASUREMENTS TABLE.

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