Service difficulty report · Support · Boeing 7378H4

Difficulty date
June 20, 2023
Submitted
July 19, 2023
Operation
Air carrier
Aircraft
N8543Z
Make and model
Boeing 7378H4
Aircraft serial
63587
Aircraft time
19,500 hours, 9,726 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 R/H FLOOR TO SIDEWALL SUPPORT PLATE MULTIPLE AREAS AROUND NUT PLATE HOLES BS500A TO BS500I RBL22 WL156<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 500D+10' REMOVED 0.015' 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] UPDATED MEASUREMENT TABLE.;[03] VERIFIED CORRECTIVE ACTION 1.;[04] REMOVED DAMAGED FCB R/H FLOOR TO SIDEWALL SUPPORT PLATE BS500A TO BS500I; RBL22;WL156 PER SRM 53-00-53-2R-5 STEP 4. B. THRU C.;[05] ADDED PER EA M-22-153-01550 TO STEP 4.;[06] FABRICATED FCB R/H FLOOR TO SIDEWALL SUPPORT PLATE; SPLICE; QTY (2) FILLERS AND ALL REPAIR PARTS FROM BAC1496-444#7075T62 EXT. CLAD LOT #1524635-1 (SPLICE LOCATED AT BS500B+11; RBL22; WL156) PER SRM 53-00-53-2R-5 STEP 4. D. THRU G.; EA M-22-153-01550 AND DWG 143A7500.;[11] INSTALLED FCB R/H FLOOR TO SIDEWALL SUPPORT PLATES AND ALL REPAIR PARTS PER SRM 53-00-53-2R-5 STEP 4. L. THRU N.; DWG 143A7500 AND EA M-22-153-01550.;[12] 'THE DAMAGE WAS REPAIRED PER SRM 53-00-53-2R-5 (REPAIR 5) AND EA M-22-153-01550'.;[13] VERIFIED CORRECTIVE ACTION #11; 12<BR>VERIFIED MEASUREMENTS

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