Service difficulty report · Channel · Boeing 7377H4

Difficulty date
March 17, 2022
Submitted
April 20, 2022
Operation
Air carrier
Aircraft
N472WN
Make and model
Boeing 7377H4
Aircraft serial
33831
Aircraft time
58,559 hours, 34,804 cycles
System (JASC)
5200 · Doors
Part
Channel
Condition
Corroded
Location
Fwd Fuselage
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 FORWARD ENTRY DOOR MOP SILL AT B.S. 328 - B.S. 360; L.B.L. 60; W.L. 208.1. / [01] REMOVED CORROSION FROM FWD ENTRY DOOR MOP SILL IN AREA OF 2' X 2' ORIGINAL MATERIAL THICKNESS 0.090' REMAINING MATERIAL THICKNESS 0.020' FOUND TO BE OUT OF LIMIT IAW SRM 53-10-15-1A-1 DET. 4C (2A) FIG 108-D<BR>TOOLS USED CALIPER ID#ATS2318; S/N B19006095;[02] INSPECTED & VERIFIED CORRECTIVE ACTION ITEM 1.;[03] REMOVED FWD ENTRY DOOR MOP SILL FROM BS 270 TO BS 360 LBL 60 WL 208.1 IAW SRM 51-40-02-0G-0;[04] LOCATED AND DRILLED NEW FED MOPSILL PN#141A8112-1; PO#861974 IAW SRM 51-40-05 AND IAW DWG#141A8110. OK TO INSTALL;[05] VERIFIED CORRECTIVE ACTION 3-4. OK TO INSTALL REPLACEMENT MOPSILL;[06] INSTALLED FWD ENTRY DOOR MOP SILL IAW SRM 51-40-02-0G-0 AND DRAWING#143A8110;[07] UPDATED DRAWING USED #141A8110;[08] VERIFIED FASTENER INSTALLATION;[09] ALL STEPS COMPLETED;[10] VERIFIED ALL STEPS COMPLETE.

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