Service difficulty report · Angle · Boeing 7377H4

Difficulty date
April 4, 2023
Submitted
April 28, 2023
Operation
Air carrier
Aircraft
N412WN
Make and model
Boeing 7377H4
Aircraft serial
29818
Aircraft time
71,376 hours, 42,351 cycles
Part
Angle
Condition
Corroded
Location
Zn 200 Fus Top
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

CORROSION ON ANGLE AT MID CABIN BS663+29 RBL66 WL203.<[01] NO ALLOWABLE LIMITS FOUND DAMAGE TO BE REMOVED I.A.W SRM 51-10-02-0G-0 AND SUBMITTED ENGINEERING FOR FURTHER INSTRUCTION.;[02] REMOVED CORROSION ON ANGLE SURFACE AT MID CABIN BS692 RBL64-RBL65 WL203 1'X0.500' AREA I.A.W SRM 51-10-02-0G-0;[03] REQUEST HFEC TO VERIFY CRACK FREE CONDITION AND UT TO VERIFY REMAINING MATERIAL THICKNESS;[04] UPDATED P/N;[05] VERIFIED CORRECTIVE ACTION 1 AND 2;[06] ACCOMPLISHED HFEC SURFACE SCAN IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>ACCOMPLISHED UT THICKNESS MEASUREMENT IAW 737 NDTM PART 4 CHAPTER 51-00-00 PROCEDURE 2.<BR><BR>MINIMUM REMAINING MATERIAL THICKNESS FOUND 0.070' ADJACENT TO 0.071'<BR><BR>EQUIPMENT USED:<BR>-NORTEC 600 ID: ATS1465 CAL DUE: 09/2023<BR>-EPOCH 650 ID: ATS2342 CAL DUE: 07/2023;[07] AS PER EA 23-153-01206; THE REWORK IS ACCEPTABLE AS A CONTINUE-IN-SERVICE CONDITION WITHOUT REPETITIVE INSPECTIONS AND NO TERMINATING ACTION REQUIREMENTS.;[08] VERIFIED CORRECTIVE ACTION 7.

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