Service difficulty report · Sidewall Support · Boeing 7378H4

Difficulty date
March 27, 2023
Submitted
April 26, 2023
Operation
Air carrier
Aircraft
N8529Z
Make and model
Boeing 7378H4
Aircraft serial
36974
Aircraft time
19,992 hours, 9,666 cycles
Part
Sidewall 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 FWD CARGO BAY R/H FLOOR TO SIDEWALL SUPPORT PLATE MULTIPLE AREAS AROUND NUT PLATE HOLES BS500A TO BSBS500I RBL24.5 WL156<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 500E+12' REMOVED 0.015' IN A 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 1 AND MEASUREMENT TABLE;[03] REMOVED DAMAGED CARGO BAY R/H FLOOR TO SIDEWALL SUPPORT BS500A TO BS500I RBL24.5 WL156. IAW EA NO: M-22-153-01550 REV. A; AND SRM 53-00-53-2R-5;[04] FABRICATED FCB R/H FLOOR TO SIDEWALL SUPPORT; SPLICE; REPAIR PARTS AND QTY (2) REPAIR FILLERS FROM BAC1496-444#7075T62 EXT. CLAD LOT#1520195-1 BS500A TO BS500I; RBL24.5; WL156 PER SRM 53-00-53-2R-5 STEP 4. C. THRU I.; DWG 143A7500 AND EA M-22-153-01550. SPLICE LOCATED AT BS500D+10; RBL24.5; WL156. APPLIED PRIMER TO FCB R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A TO BS500I; RBL24.5; WL156 PER SRM 53-00-53-2R-5 STEP 4. J.; AND EA M-22-153-01550BEGAN INSTALLING FCB R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A T0 BS500I; RBL24.5; WL156 PER SRM 53-00-53-2R-5; DWG 1437500 AND EA M-22-153-01550.;[09] INSTALLED FCB R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A TO BS500I; RBL24.5; WL156 PER SRM 53-00-53-2R-5 STEP 4. K. THRU O.; DWG 1437500 AND EA M-22-153-01550.;[10] 'THE DAMAGE WAS REPAIRED PER SRM 53-00-53-2R-5 (REPAIR 5) AND EA M-22-153-01550'

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