Service difficulty report · Sidewall Support · Boeing 7377H4

Difficulty date
June 21, 2022
Submitted
July 27, 2022
Operation
Air carrier
Aircraft
N486WN
Make and model
Boeing 7377H4
Aircraft serial
33852
Aircraft time
59,624 hours, 35,506 cycles
Part
Sidewall Support
Part number
143A75014
Condition
Corroded
Location
Fwd Cargo Bay
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 500B+2; BS 500B+6; BS 500B+14; BS 500B+18; BS 500C+2; BS 500C+6; BS 500C+10. / [01] REMOVED CORROSION IN FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL24 BS500A TO BS500D;MEASURE:L=.6;W=.6;D=0.027';MATERIAL LOSS:0.027';ORIGINAL MATERIAL:7075-T6 .040' TICKNESS;FOUND PRT TO BE OUT LIMITS;IAW SRM 53-30-53 AND 53-00-53-1A-2 PARAG. 4A(2) DETAIL D;[02] VERIFIED PARTIAL STEPS.;[03] LOCATED; FABRICATED AND DRILLED NEW FLOOR TO SIDEWALL SUPPORT AT RBL24 BS 500A TO BS 500D;WITH MATERIAL BAC1496-444 7075-T6;LOT#1490548-1;IAW SRM 53-30-53;51-40-05;AND DWG#143A7500.OK TO TREAT AND PRIME.;[04] VERIFIED CORRECTIVE ACTION STEP 3. VERIFIED OK TO TREAT AND PRIME.;[05] TREATED AND PRIMED SIDEWALL SUPPORT AT RBL24 BS 500A TO BS 500D IAW SRM 51-20-01 AND SOPM 20-41-02.ALL MAINTENANCE ACTION ARE COMPLETED REQUIRE FINAL BUY OFF.;[06] VERIFIED CORRECTIVE ACTION STEP 5. VERIFIED MEASUREMENT TABLE AND TASK CARD COMPLETE.

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