Service difficulty report · Plate · 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
Plate
Condition
Corroded
Location
Aft Cargo
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 R/H FLOOR TO SIDEWALL SUPPORT PLATE HAS MULTIPLE AREAS OF CORROSION BS727H TO BS767 RBL22 WL156 / [01] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 747+10 RBL 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;[02] VERIFIED MEASUREMENT FIELDS; VERIFIED ACTION #1;[03] REMOVED SECTION OF DAMAGED ACB R\H FLOOR TO SIDEWALL SUPPORT BS=727F+11' TO BS=767' RBL22 WL156 PER SRM 51-40-02-0G-0;[04] FABRICATED; LOCATED; DRILLED AND DEBURRED; APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON NEW R\H FLOOR TO SIDEWALL SUPPORT SECTION FROM BS727F+11' TO BS767' RBL22 WL156 AND SPLICE AT BS727F+11'; EXTRUSION MATERIAL USED BAC1496-377#7075T62 CLAD; LOT# 1500263-1 PER SRM 51-40-05-0G-0; SRM 53-00-53-2R-5 REP 5; SRM 51-20-01; SOPM 20-41-02 AND DWG 146A7500. OK TO INSTALL;[05] VERIFIED CORRECTIVE ACTION 4- OK TO INSTALL FLOOR TO SIDEWALL SUPPORT.;[06] INSTALLED R/H FLOOR TO SIDEWALL SUPPORT SECTION BS727F+11' TO BS767' RBL22 WL156 AND SPLICE AT BS727F+11' PER SRM 51-40-02-0G-0; SRM 53-00-53-2R-5 REP 5 AND DWG 146A7500.;[07] INSTALLED NEW FLOOR TO SIDEWALL SUPPORT SECTION BS727F+11' TO BS767' RBL22 WL156 AND SPLICE AT BS727F+11' PER SRM 51-40-02-0G-0; SRM 53-00-53-2R-5 REP 5;EA M-22-153-01550 AND DWG 146A7500.;[08] THE DAMAGE WAS REPAIRED PER SRM 53-000-53-2R-5 (REPAIR 5) AND EA-22-153-01550.

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