Service difficulty report · Support · Boeing 7378H4

Difficulty date
February 1, 2023
Submitted
March 10, 2023
Operation
Air carrier
Aircraft
N8524Z
Make and model
Boeing 7378H4
Aircraft serial
36970
Aircraft time
20,203 hours, 9,817 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 FLOOR TO SIDEWALL SUPPORT BS 500A+2' TO BS 500F+6' RBL 23 WL 156<[01] ATTACHED PHOTO;[02] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 500D+10 RBL 23 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 ATS 2473 DUE 08/2023;[03] VERIFIED STEPS 1; 2 AND MEASUREMENT FIELD.;[04] REMOVED DAMAGED FLOOR TO SIDEWALL SUPPORT BS500A TO BS500I; RBL23; WL156 PER SRM 53-00-53-2R-5 STEP 4. B. AND EA M-22-153-01550.;[05] FABRICATED FCB FLOOR TO SIDEWALL SUPPORT PLATE BS500A TO BS500I; RBL23; WL156 (SPLICE AT BS500B +10.5; RBL23; WL156) QTY 2 TAPERED FILLERS AND ALL REPAIR PARTS FROM BAC1496-444#7075T62 CLAD LOT#1506362-1 PER SRM 53-00-53-2R-5 STEP 4. C. THRU G.; DWG143A7500 AND EA M-22-15301550.;[06] FABRICATED FCB FLOOR TO SIDEWALL SUPPORT PLATE BS500A TO BS500I; RBL23; WL156 (SPLICE AT BS500B +10.5; RBL23; WL156) QTY 2 TAPERED FILLERS PER SRM 53-00-53-2R-5 STEP 4. H. AND I.; DWG 143A7500 AND EA M-22-153-01550. OK TO PRIME;;[14] 'THE DAMAGE WAS REPAIRED PER SRM 53-00-53-2R-5 (REPAIR 5) AND EA M-22-153-01550'.;[15] VERIFIED CORRECTIVE ACTIONS 12-14;[16] VERIFIED COMPLETE

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