Service difficulty report · Threshold · Boeing 7377H4

Difficulty date
December 5, 2023
Submitted
January 16, 2024
Operation
Air carrier
Aircraft
N455WN
Make and model
Boeing 7377H4
Aircraft serial
32462
Aircraft time
64,648 hours, 38,599 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 FORWARD CORNER THRESHOLD IS CRACKED<[01] VERIFIED MEASUREMENTS.;[02] UPDATED CORRECTIVE ACTION STEP 1. CRACK ON SCUFF PLATE WAS FOUND TO BE OUT OF LIMITS AS PER SRM 53-30-15-1A-1.;[03] CORRECTION TO STEP 2 SHOULD STATE ' CRACK ON SCUFF PLATE WAS FOUND TO BE OUT OF LIMITS AS PER SRM 53-30-15-1A-1. ';[04] UPDATED MEASUREMENT TABLE.;[05] WELDED CORNER SCUFF PLATE USING ER4043 FILLER ROD LOT NUMBER 1131216 PER SRM 53-30-15-2R-1 PARAGRAPH 4.B (4) AND BAC5975<BR>EQUIPMENT USED: WELDING MACHINE E10583; CALIBRATION DUE DATE 01/2024 APPLIED A CHEMICAL CONVERSION COATING TO THE BARE ALUMINUM SURFACES PER SOPM 20-43-03; TYPE 2 CLASS A OR C AND SRM 53-30-15-2R-1 PARAGRAPH 4.B. (6) APPLIED TWO LAYERS OF BMS 10-11; TYPE 1 PRIMER TO THE INNER SURFACES OF THE CORNER SCUFF PLATE PER SRM 53-30-15-2R-1 PARAGRAPH 4.B. (7); REFER TO SOPM 20-41-02;[06] VERIFIED CORRECTIVE ACTION #5

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