Service difficulty report · Support · Boeing 7377Q8

Difficulty date
June 3, 2022
Submitted
June 30, 2022
Operation
Air carrier
Aircraft
N7850B
Make and model
Boeing 7377Q8
Aircraft serial
28238
Aircraft time
59,194 hours, 39,098 cycles
Part
Support
Condition
Corroded
Location
Fwd 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 ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 24 BS 500A+10; BS 500A+14; BS 500B+6; BS 500B+10; BS 500B+18; BS 500C+10. / [01] SRM 53-00-53-1A-2 IS FOUND TO BE APPLICABLE FOR THIS REPAIR;[02] REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT RBL 24 BS 500A+10 L=1.6'XW=.7'XD=.002'; BS500A+14 L=1.7'XD=.9'XD=.001'; BS500B+6 L=1'XW=.7'XD=.003'; BS500B+10 L=1'XW=.9'XD=.002'; BS500B+18 L=.9'XW=.7'XD=.001'; BS500C L=1.1XW=.6'XD=.004'. FOUND TO BE IN LIMITS WITH REMAINING THICKNESS OF .036' OF ORIGINAL THICKNESS .040'. IAW SRM 53-30-53-0I-2 AND 53-00-53-1A-1.<BR><BR>DIAL DEPTH GAGE ID:ATS2473 S/N:UNKNOWN DUE: 07/2022;[03] VERIFIED;[04] REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT RBL 24 BS 500A+10 L=1.6'XW=.7'XD=.002'; BS500A+14 L=1.7'XD=.9'XD=.001'; BS500B+6 L=1'XW=.7'XD=.003'; BS500B+10 L=1'XW=.9'XD=.002'; BS500B+18 L=.9'XW=.7'XD=.001'; BS500C L=1.1XW=.6'XD=.006'. FOUND TO BE OUT OF LIMITS WITH REMAINING THICKNESS OF .034' OF ORIGINAL THICKNESS .040'. IAW SRM 53-30-53-0I-2 AND 53-00-53-1A-1.<BR><BR>DIAL DEPTH GAGE ID:ATS2473 S/N:UNKNOWN DUE: 07/2022;[07] FABRICATED REPLACMENT FCB R/H FLOOR TO SIDEWALL SUPPORT BS 500A-500D PER SRM 51-40-05-0G-0; SRM 51-40-08-0G-0; AND DWG 143A7501 OUT OF BAC1496-444#7075T62 LOT:1485395-1;[08] FABRICATED REPLACMENT FCB R/H FLOOR TO SIDEWALL SUPPORT BS 500A-500D PER SRM 51-40-05-0G-0; SRM 51-40-08-0G-0; AND DWG 143A7501 OUT OF BAC1496-444#7075T62 LOT:1485395-1

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