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 LBL 24 BS 500B+2; BS 500B+10; BS 500B+18; BS 500C+2; BS 500C+10; BS 500C+14.<[01] SRM 53-00-53-1A-2 IS FOUND TO BE APPLICABLE. EVALUATED 6 SPOTS OF CORROSION FROM BS500B+2 - BS500C+14 THE DEEPEST SPOT IS .8L X .6W Y.016. ORIGINAL THICKNESS IS 0.040; REMINING THICKNESS IS 0.024. PART IS OUT OF LIMITS. IAW SRM 53-00-53-1A-2<BR>CAL TOOL ID: ATS2595 SER#F03295 EXP: 02/2023;[02] VERIFIED CORRECTIVE ACTION #1;[03] FABRICATED; LOCATED AND DRILLED NEW FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AND SPLICE AT LBL 24 FROM BS 396 TO BS 500D; FROM BAC1496-444#7075T62; LOT#1515896-1; IAW SRM 51-40-05-0G-0; SRM 53-00-53-1A-2; REPAIR 6 FIGURE 202; DWG 143A7501; ID:0112; REV: A; APPLIED CHEMICAL CONVERSION IAW AMM 51-21-41-370-802; REQUEST OK TO APPLY PRIMER;[04] FIXED MEASUREMENT CHART;[05] VERIFIED CORRECTIVE ACTION 3 AND 4. OK GIVEN TO PRIME.;[06] APPLIED PRIMER ON NEW FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT IAW AMM 51-21-72-370-804; OK TO INSTALL SPLICE;[07] VERIFIED CORRECTIVE ACTION 6.OK TO VINSTALL GIVEN;[08] INSTALLED REPAIR SPLICE ON NEW FLOOR TO SIDEWALL SUPPORT LOCATED BTW BS 480 TO 500 LBL 24 WL 156 IAW SRM 51-40-02 AND SRM 53-00-53-2R-6 REPAIR 6;[09] VERIFIED STEP 8;[10] VERIFIED ALL STEPS COMPLETE;[11] VERIFIED MEASUREMENT TABLE;[12] CERTIFIED STEP

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