Service difficulty report · Sidewall Support · Boeing 7377CT

Difficulty date
October 13, 2022
Submitted
November 17, 2022
Operation
Air carrier
Aircraft
N569WN
Make and model
Boeing 7377CT
Aircraft serial
33656
Aircraft time
66,340 hours, 34,395 cycles
Part
Sidewall 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 500A+18; BS 500B+2; BS 500B+6; BS 500B+10; BS 500B+18; BS 500C+2; BS 500C+6; BS 500C+10. / [01] VERIFIED APPLICABILITY FOR ALLOWABLE DAMAGE LIMITS;IAW SRM 53-00-53-1A-2.;[02] REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT AT BS500A+18;RBL24;MEASURES:L=1.00;W=.6;D=0.020';ORIGINAL MATERIAL IS 0.040';REMAINING TICKNESS:0.020';FOUND TO BEOUT LIMITS;IAW SRM 53-00-53-1A-2;PARAG 4A(2) DETAIL D;FIG 103 AND SRM 53-30-53-0I-2 IDENTIFICATION 2 TABLE 2;TOOL USED ATS:2677;S/N UNKNOWN;DUE:11/2022.;[03] COMPLETED STEPS#1-2-3-4-5-6-7-8.;[04] VERIFIED CORRECTIVE ACTIONS #1 AND #2 PARTIAL UPDATES STEPS 1-7;[05] PARTIAL UPDATE STEP 8;[06] FABRICATED; LOCATED AND DRILLED NEW FLOOR TO SIDEWALL SUPPORT IAW SRM 51-40-05-0G-0 AND DRAWING#143A7501; LOT#1506362-1 BAC1496-444#7075T62.<BR>OK TO TREAT AND PRIME.;[07] VERIFIED ACTION #6; OK TO PRIME GIVEN;[08] TREATED AND PRIMED NEW FLOOR TO SIDEWALL SUPPORT IAW SRM 51-20-01 AND SOPM 20-41-02.ALL MAINTENANCE ACTION ARE COMPLETED REQUIRE FINAL BUYOFF.;[09] VERIFIED CORRECTIVE ACTION ITEM 8. <BR>MEASUREMENT FIELD NOT 'MAJOR' REPAIR; NEED CORRECTION BY AMT.;[10] MEASUREMENT FIELD ITEM#19 UPDATED.;[11] COMPLETED MEASUREMENT FIELD#19 REQUIRE FINAL BUY OFF.;[12] VERIFIED CORRECTIVE ACTION ITEM 10-11; AND MEASUREMENT FIELDS; CARD COMPLETE.

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