Service difficulty report · Support · Boeing 7378H4

Difficulty date
September 24, 2022
Submitted
October 11, 2022
Operation
Air carrier
Aircraft
N8504G
Make and model
Boeing 7378H4
Aircraft serial
38812
Aircraft time
20,122 hours, 9,566 cycles
Part
Support
Condition
Corroded
Location
Fuselage
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

AFT CARGO BAY L/H FLOOR TO SIDEWALL HAS MULTIPLE AREAS OF CORROSION BS727E TO BS787+6 LBL22 WL156 / [01] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 727G+10 LBL 22 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 2678 DUE 04/2023;04] FABRICATED; LOCATED; DRILLED; APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON NEW FLOOR TO SIDEWALL SUPPORT SECTION BS727D+14' TO BS787+7' LBL22 WL 156; EXTRUSION MATERIAL USED: BAC1496-377#7075T62; LOT: 1503751-1; IAW SRM 53-00-53-2R-5 REPAIR 5; SRM 51-40-05-0G-0; SRM 51-20-01; SOPM 20-41-02 AND DWG 146A7500<BR>OK TO INSTALL;[05] VERIFIED LOCATION OF DAMAGED REMOVED BTW BS 727D+14' TO BS787+7' LBL22 WL156 ON CORRECTIVE ACTION IS DOCUMENTED AS BS BS787+17'. FABRICATED; LOCATED; DRILLED; APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON NEW FLOOR TO SIDEWALL SUPPORT SECTION BS727D+14' TO BS787+7' LBL22 WL 156; EXTRUSION MATERIAL USED: BAC1496-377#7075T62; LOT: 1503751-1; IAW SRM 53-00-53-2R-5 REPAIR 5; SRM 51-40-05-0G-0; SRM 51-20-01; SOPM 20-41-02 AND DWG 146A7500OK TO INSTALL;[06] VERIFIED CORRECTIVE ACTION 4 AND 5. OK TO INSTALL;[07] INSTALLED NEW FLOOR TO SIDEWALL SUPPORT SECTION BS727D+14' TO BS787+7' AND SPLICE 3EA LOCATED AT BS BS727D+14' AND 727H +11'; BS787+7' ; LBL22 WL 156; IAW SRM 53-00-53-2R-5 REPAIR 5; EA M-22-153-01550 AND DWG 146A7500;

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