Service difficulty report · Intercostal · Boeing 73776Q

Difficulty date
April 22, 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
Intercostal
Condition
Cracked
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

AFT CARGO BAY INTERCOSTAL AT BS 927-947 RBL 20 IS CRACKED<[01] REMOVED INTERCOSTAL AT AFT CARGO BAY BETWEEN BS 927 - BS 947 RBL 20 IAW SRM 51-40-02.<BR>MEASURED CRACK ON WEB: L=.6' FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 PARAGRAFH 4.C;[02] RECEIVED INTERCOSTAL P/N 147A7500-22; LOT:1492095-10.<BR>LOCATED AND DRILLED INTERCOSTAL AT AFT CARGO BAY AT BS 927-947 RBL 20 IAW SRM 51-40-05 DWG# 147A7500.<BR>OK TO INSTALL.;[03] VERIFIED CORRECTIVE ACTION STEPS 1 AND 2. TASK CARD COMPLETE.;[04] INSTALLED INTERCOSTAL AT AFT CARGO BAY INTERCOSTAL AT BS 927-947 RBL 20 IAW SRM 51-40-02 & DWG# 147A7500.;[05] VERIFIED CORRECTIVE ACTION STEP 4.;[06] VERIFIED MEASUREMENT TABLE AND TASK CARD COMPLETE.

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