Service difficulty report · Support · Boeing 7378H4

Difficulty date
May 18, 2023
Submitted
June 16, 2023
Operation
Air carrier
Aircraft
N8535S
Make and model
Boeing 7378H4
Aircraft serial
63596
Aircraft time
19,603 hours, 9,695 cycles
Part
Support
Part number
UNKNOWN
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 FWD CARGO BAY L/H FLOOR TO SIDEWALL SUPPORT PLATE MULTIPLE AREAS AROUND NUT PLATE HOLES BS480+6' TO BS500C+11' LBL22 WL156<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 500A+6' REMOVED 0.010' IN AN AREA OF 1'X1' ORIGINAL THICKNESS 0.040' FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING ATS TOOL ID ATS 2473 DUE 08/2023;[02] VERIFIED CORRECTIVE ACTION STEP 1.;[03] REMOVED DAMAGED SECTION OF FCB L/H FLOOR TO SIDEWALL SUPPORT BS460+9 TO BS500D+9; LBL22; WL156. PER SRM 53-00-53-2R-5 STEP 4.B. & C. AND EA M-22-153-01550.;[04] BEGAN FABRICATION OF FCB L/H FLOOR TO SIDEWALL SUPPORT; SPLICES; AND ALL REPAIR PARTS FROM BAC1496-444#7075T62 EXT. CLAD LOT#1520195-1 PER SRM 53-00-53-2R-5 STEP 4. D. THRU F. AND EA M-22-153-01550.;[05] FABRICATED FCB L/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS460+9 TO BS500D+9; LBL22; WL156; FROM BAC1496-444#7075T62 EXT. CLAD LOT#1520195-1 PER SRM 53-00-53-2R-5 STEP 4. G. THRU I.; DWG 143A7500 AND EA M-22-153-01550. QTY (2) SPLICES LOCATED AT BS460+9; LBL22; WL156 AND BS500D+9; LBL22; WL156. OK TO APPLY PRIMER.

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