Service difficulty report · Support · Boeing 7377H4

Difficulty date
August 18, 2022
Submitted
September 27, 2022
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
57,460 hours, 34,246 cycles
Part
Support
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 ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 21 BS 727E; BS 727E+10; BS 727E+18; BS 747+2; BS 747+6; BS 747+14. / [01] ENTERED MEASUREMENTS.;[02] SRM 53-00-53-1A-2 IS EFFECTIVE FOR THIS EVALUATION.<BR>REMOVED CORROSION IAW SRM 51-10-02-0G-0.<BR>AREAS MEASURE:<BR><BR>727E; 1.00'L X 1.00'W X 0.007'D<BR><BR>727E+10; 1.20'L X 1.00'W X 0.008'D<BR><BR>727E+18 2.40'L X 1.10'W X 0.009'D<BR><BR>747+2 2.50'L X 1.40'W X 0.009'D<BR><BR>747+6 1.90'L X 1.20'W X 0.008'D<BR><BR>747+14 2.30'L X 1.00'W X 0.011'D<BR><BR>ORIGINAL MATERIAL THICKNESS - 0.040'<BR>REMAINING MATERIAL - 0.029'<BR>DIAL DEPTH GAGE: ATS401; S/N UNKNOWN; CAL DUE 10/2022;[03] CCORROSION FOUND TO BE OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2; 4A(2)(A) FIGURE 103; DETAIL E.<BR>REPAIR BY REPLACEMENT IAW SRM 51-10-02-0G-0; STEP 9.;[04] VERIFIED ACTION #1-3;[05] REMOVED ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT FROM BS 727+4 TO BS 767 ; RBL 21 IAW SRM 51-40-02-0G-0;[06] FABRICATED; LOCATED AND DRILLED NEW FLOOR TO SIDEWALL SUPPORT AND SPLICE FROM BAC1496-377 7075-T62 ; LOT# 1500263-1 ; BS 727+4 TO BS 767 ; RBL 21 IAW SRM 51-40-05-0G-0; DWG 146A7502; ID:0026. REV:-; APPLIED CHEMICAL CONVERSION IAW AMM 51-21-41-370-802; OK TO APPLY PRIMER;[17] UPGRADED REPAIR TYPE TO MAJOR DUE TO REPAIR. SPLICE INSTALLED.;[18] VERIFIED TABLE MEASUREMENT REPAIR TYPE UPGRADE;[19] VERIFIED CORRECTIVE ACTION 17 AND 18;[20] VERIFIED MEASUREMENT TABLE

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