Service difficulty report · Sidewall Support · Boeing 7377H4

Difficulty date
April 30, 2022
Submitted
June 9, 2022
Operation
Air carrier
Aircraft
N477WN
Make and model
Boeing 7377H4
Aircraft serial
33988
Aircraft time
60,414 hours, 35,826 cycles
Part
Sidewall Support
Condition
Corroded
Location
Fwd 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 FCB FLOOR TO SIDEWALL SUPPORT AT FASTENER HOLES COMMON TO FLOOR AND SIDEWALL PANEL INSTALLATION. BS500A TO BS500D; RBL21; WL156 / [01] VERIFIED APPLICABILITY FOR ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 AND IDENTIFICATION IAW SRM 53-30-53-0I-2 IDENTIFICATION 2;[02] UPDATE STEP 1-4;[03] CERTIFIED CORRECTIVE ACTION 1-2.;[04] VERIFIED STEPS 1-4.;[05] VERIFIED CORRECTIVE ACTION 1.;[06] FABRICATED LOCATED AND DRILLED FCB NEW TO SIDEWALL SUPPORT BS 500A TO BS 500D ;RBL 21;WL 156; MATERIAL USED BAC1496-444#7075T62 LOT#1487676-1 IAW SRM 51-40-05 AND DWG 143A7501 REV:A;APPLY CHEMICAL CONVERSION COATING AND PRIMER.;[07] CERTIFIED CORRECTIVE ACTION 6.;[08] VERIFIED CORRECTIVE ACTION 6.;[09] APPLIED CHEMICAL CONVERSION COATING AND PRIMER FCB FLOOR TO SIDEWALL SUPPORT BS 500A TO BS 500D RBL 21; WL 156 IAW SRM 51-20-01 AND AMM 51-21-72-370-804.;[10] CERTIFIED CORRECTIVE ACTION 9.;[11] VERIFIED CORRECTIVE ACTION #9;[12] TASK COMPLETE

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