Service difficulty report · Plate · Boeing 7378H4

Difficulty date
September 1, 2022
Submitted
September 15, 2022
Operation
Air carrier
Aircraft
N8502Z
Make and model
Boeing 7378H4
Aircraft serial
36666
Aircraft time
19,989 hours, 9,530 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

CORROSION AFT CARGO BAY R/H FLOOR TO SIDEWALL SUPPORT PLATE MULTIPLE AREAS CORROSION BS727F TO BS767 RBL21 WL156 / [01] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 727G+10 RBL 21 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 CORRECTIVE ACTION #1 AND MEASUREMENT FIELD;[03] VALIDATED APPLICABILITY OF SRM 53-00-53-2R-5;[04] REMOVED SECTION OF DAMAGED ACB R/H FLOOR TO SIDEWALL BS727F+11' TO BS767' RBL21 WL156 PER SRM 51-40-02-0G-0;[05] 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' RBL21 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;[06] VERIFIED CORRECTIVE ACTION ITEMS 3-5;[07] OK TO INSTALL NEW R/H FLOOR TO SIDEWALL;[08] VERIFIED CORRECTIVE ACTION 7; OK TO INSTALL GIVEN.;[09] INSTALLED NEW R\H FLOOR TO SIDEWALL SUPPORT SECTION FROM BS727F+11' TO BS767' RBL21 WL156 PER SRM 51-40-02-0G-0 AND DWG 146A7500;[10] VERIFIED CORRECTIVE ACTION 9 AND MEASUREMENT TABLE.

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