Service difficulty report · Support · Boeing 7377H4

Difficulty date
February 3, 2023
Submitted
March 2, 2023
Operation
Air carrier
Aircraft
N404WN
Make and model
Boeing 7377H4
Aircraft serial
27892
Aircraft time
72,784 hours, 43,149 cycles
Part
Support
Condition
Corroded
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

CORROSION AT FCB ON AFT BULKHEAD TO FLOOR SUPPORT BS500D LBL18 TO RBL14 WL156. MARKED.<[01] REMOVED DAMAGED FCB AFT BULKHEAD TO FLOOR SUPPORT BS500D LBL18 TO RBL 14 WL156; NO DATA FOUND ON SRM FOR DAMAGED HOLES; PART REPLACEMENT IAW SRM 51-10-02-0G-0 PAR.9.;[02] CORRECTED MEASUREMENT TABLE;[03] CORRECTION TO STEP 1; PART WAS NOT REMOVED ON THIS CARD; ALSO THERE ARE SRM LIMITS FOR THIS PART. EVALUATED CORROSION AT ALL LOCATION OF BULKHEAD SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 500D RBL 12 WL 156; FOUND 0.020 REMOVED FROM ORIG 0.071 IN NUMEROUS 1'X1' AREAS; FOUND TO BE OUT OF LIMITS PER SRM 53-30-08-1A-1 USING DIAL DEPTH GAUGE ATS 2473 DUE 08/2023;[04] VERIFIED CORRECTIVE ACTIONS 2; 3; AND MEASUREMENT TABLE.;[05] LOCATED AND DRILLED NEW FORWARD CARGO BAY AFT BULKHEAD TO FLOOR SUPPORT BS 500D LBL 18 TO RBL 14 WL 156 PER SRM 51-40-05-0G-0 AND DWG 143A7902;[06] VERIFIED CORRECTIVE ACTION 5

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