Service difficulty report · Support · Boeing 7377H4

Difficulty date
January 24, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 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

CORROSION ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 24 BS 400+2; BS 400+6; BS 400+14; BS 400+18.<[01] UPDATED MEASUREMENTS.;[02] SRM 53-00-53-1A-2 IS FOUND TO BE APPLICABLE. EVALUATED 4 SPOTS OF CORROSION FROM BS400+2 - BS400+18 THE DEEPEST SPOT IS .6L X .5W Y.010. ORIGINAL THICKNESS IS 0.040; REMINING THICKNESS IS 0.030. PART IS OUT OF LIMITS. IAW SRM 53-00-53-1A-2<BR>CAL TOOL ID: ATS2595 SER#F03295 EXP: 02/2023;[03] UPDATED MEASUREMENTS.;[04] UPDATEED MEASUREMENTS;[05] VERIFIED CORRECTIVE ACTION #2;[06] FABRICATED; LOCATED AND DRILLED NEW FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 24 FROM BS 396 TO BS 420; FROM BAC1496-444#7075T62; LOT#1515896-1; IAW SRM 51-40-05-0G-0; S; DWG 143A7501; ID:0114; REV: -; APPLIED CHEMICAL CONVERSION IAW AMM 51-21-41-370-802; REQUEST OK TO APPLY PRIMER;[07] REMOVE AND REPLACE OF PRIMARY STRUCTURE IS A MINOR REPAIR BUT THE CORROSION LVL IS 2. MEASURMENT TABLE NEEDS TO BE CORRECTED.;[08] VERIFIED CORRECTIVE ACTION 6 AND OK TO PRIME.;[09] UPDATED MEASUREMENT TABLE;[10] VERIFIED MEASUREMENT TABLE COMPLETED.;[11] APPLIED PRIMER AND NUT PLATES IAW SRM 51-20-01; SRM 51-40-10. ALL STEPS COMPLETE.;[12] VERIFIED STEP 11;[13] ALL STEPS COMPETE

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