Service difficulty report · Threshold · Boeing 7377H4

Difficulty date
February 27, 2024
Submitted
March 20, 2024
Operation
Air carrier
Aircraft
N427WN
Make and model
Boeing 7377H4
Aircraft serial
29831
Aircraft time
72,191 hours, 42,823 cycles
Part
Threshold
Part number
UNKNOWN
Condition
Cracked
Location
Aft Cargo
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 FORWARD CORNER THRESHOLD IS CRACKED<[01] VERIFIED STEPS 3;4 COMPLETE.;[02] VERIFIED STEP 6 COMPLETE.;[03] REMOVED ALL THE COATINGS FROM THE CORNER SCUFF PLATE BEFORE WELDING APPROXIMATELY 1 INCH FROM WELD AREA PER SOPM 20-30-02 WELDED CRACK ON CORNER SCUFF PLATE USING ER4043 FILLER ROD LOT NUMBER 1131216 PER BAC5975.<BR>EQUIPMENT USED; WELDING MACHINE E10583; CAL DUE DATE 01/2025 APPLIED A CHEMICAL CONVERSION COATING TO THE BARE ALUMINUM SURFACES PER SOPM 20-43-03; TYPE 2; CLASS A OR C. APPLIED TWO LAYERS OF BMS 10-11; TYPE 1 PRIMER TO THE INNER SURFACES OF CORNER SCUFF PLATE PER SOPM 20-41-02;[04] VERIFIED CORRECTIVE ACTION 3.<BR>JOB COMPLETE.

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