Service difficulty report · Support · Boeing 7378H4

Difficulty date
October 10, 2022
Submitted
October 28, 2022
Operation
Air carrier
Aircraft
N8507C
Make and model
Boeing 7378H4
Aircraft serial
41531
Aircraft time
20,008 hours, 9,579 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

FWD CARGO BAY R/H FLOOR TO SIDEWALL SUPPORT PLATE HAS CORROSION AROUND NUT PLATE HOLE BS500F+7 RBL24.5 WL156 / [01] UPDATED MEASUREMENT TABLE FOR PICTURE OF CORROSION ATTACHED;[02] EVALUATED CORROSION AT BS 500F+7' REMOVED 0.015' IN A AREA OF 1'X1' ORIGINAL THICKNESS 0.040' FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING ATS TOOL ID ATS2678 EXP 4/2023;[03] VERIFIED APPLICABILITY OF SRM 53-00-53-1A-2.;[04] VERIFIED CORRECTIVE ACTIONS 1-3<BR><BR>VERIFIED MEASUREMENTS TABLE<BR><BR>VERIFIED PICTURE OF CORROSION IS ATTACHED TO THE FAULT<BR><BR>VALIDATED APPLICABILITY OF SRM 53-00-53-1A-2.;[05] REMOVED R/H FLOOR TO SIDEWALL SUPPORT AT BS 500A TO 500I PER SRM 51-40-02-0G-0;[06] LOCATED AND DRILLED NEW R/H FLOOR TO SIDEWALL SUPPORT BS 500A TO BS 500I RBL 25 WL 156 PER SRM 51-40-05-0G-0; AND DWG 143A7500. OK TO INSTALL FLOOR TO SIDEWALL SUPPORT;[07] VERIFIED CORRECTIVE ACTION 6.<BR>OK TO INSTALL;[08] INSTALLED R/H FLOOR TO SIDEWALL SUPPORT AT BS 500A TO BS 500I RBL 25 WL 156 PER SRM 51-40-02-0G-0; DWG 143A7501 AND DWG 143A7500;[09] VERIFIED CORRECTIVE ACTION 8;[10] VERIFIED MEASUREMENT TABLE

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