Service difficulty report · Sidewall Support · Boeing 73776Q

Difficulty date
April 14, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 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 FLOOR TO SIDEWALL SUPPORT AT ACB RBL21 BS727B+4; BS727C+14 - BS767 WL156.<[01] VERIFY APPLICABILITY PER SRM 53-60-53-0I-2 AND SRM 53-00-53-1A-2.<BR>REMOVED CORROSION ON DISCREPANCY AREA L=0.800';W=0.700';D=0.010'. FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 AND SRM 51-10-02.<BR>TOOL USED: ID:ATS1672; DUE:MAR-31-2024;[02] VERIFIED CORECTIVE ACTION 1 AND THE MEASUREMENT TABLE.;[03] FABRICATED NEW FLOOR TO SIDEWALL SUPPORT AT ACB RBL 21 BS 727 TO BS 767 ITEM BAC1496-377#7075T62 LOT#1521599-1 IAW SRM 51-40-05 AND DWG 146A7502.<BR>OK TREAT AND PRIMER;[04] VERIFIED CORRECTIVE ACTION 3. OK TO TREAT AND PRIME.;[05] VERIFIED THE MEASUREMENT TABLE.;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW SRM 51-20-01 AND SOPM 20-41-02;[07] VERIFIED CORRECTIVE ACTION 6;[08] CORRECTED STEP 19 OF MESUREMENTS;[09] VERIFIED STEP 19 CORRECTION. CARD COMPLETE

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