Service difficulty report · Support · Boeing 7378H4

Difficulty date
March 10, 2023
Submitted
April 13, 2023
Operation
Air carrier
Aircraft
N8527Q
Make and model
Boeing 7378H4
Aircraft serial
36946
Aircraft time
20,252 hours, 9,861 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 ON FORWARD CARGO BAY R/H FLOOR TO SIDEWALL SUPPORT BS 500A+10 TO 500I RBL 24 WL 156<[01] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 500D+10 RBL 24 WL 156; FOUND 0.015 REMOVED FROM ORIG 0.040 IN NUMEROUS 1'X1' AREAS; FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING DIAL DEPTH GAUGE NCX000697 DUE 09/2023;[02] VERIFIED CORRECTIVE ACTION #1;[03] VERIFIED MEASUREMENTS;[04] REMOVED DAMAGED FCB R/H FLOOR TO SIDEWALL SUPPORT BS500A TO BS500I; RBL24; WL156 PER SRM 53-00-53-2R-5 STEP 4. B. AND EA M-22-153-01550.;[05] FABRICATED FCB R/H FLOOR TO SIDEWALL SUPPORT; ALL REPAIR PARTS; AND QTY (2) TAPERED FILLERS FROM BAC1496-444#7075T62 EXT. CLAD LOT#1515896-1; REPAIR SPLICE LOCATED AT BS500B+10.5; RBL24; WL156. PER SRM 53-00-53-2R-5 STEP 4. C THRU G. AND EA M-22-153-01550.;[09] APPLIED PRIMER TO FABRICATED R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A TO BS500I; RBL24; WL156 PER SRM 53-00-53-2R-5 STEP 4. J. AND EA M-22-153-01550.;[10] OK TO INSTALL FCB FABRICATED R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A TO BS500I; RBL24; WL156.[13] INSTALLED FCB FABRICATED R/H FLOOR TO SIDEWALL SUPPORT AND ALL REPAIR PARTS BS500A TO BS500I; RBL24; WL156 PER SRM 53-00-53-2R-5 STEP 4. L.; DWG 143A7500 AND EA M-22-153-01550.;

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