Service difficulty report · Intercostal · Boeing 737790

Difficulty date
August 19, 2022
Submitted
August 26, 2022
Operation
Air carrier
Aircraft
N560WN
Make and model
Boeing 737790
Aircraft serial
30542
Aircraft time
70,697 hours, 34,642 cycles
Part
Intercostal
Condition
Cracked
Location
Fuselage
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

CRACK ON ACB INTERCOSTAL BS440 LBL24 / [01] UPDATED FAULT ENTRY : CRACK ON FCB INTERCOSTAL BS440 LBL 24;[02] EVALUATED FCB INTERCOSTAL BS440 LBL24 IAW SRM 53-00-53-1A-2 PARAGRAPH 4C. AND FOUND TO BE OUT OF LIMITS L=0.8'' TOOL USED DIGITAL CALIPER ID:ATS2738 S/N:A22004095 DUE:04/20/23. PART REPAIRABLE BY REPLACEMENT IAW SRM 51-10-02-0G-0 PART 9C.;[03] VERIFIED CORRECTIVE ACTION 1 AND 2;[04] FABRICATED ON FWD CARGO INTERCOCTAL BS.440 RBL 24 FROM ITEM 7075T6 - 0.020' SH LOTE 1489798-1 PER DWG 143A7510 OK TO PRIMR;[05] CORRECTION: TO ACTION ITEM 4 REMOVED INTERCOSTAL BS 440 LBL 24 IAW SRM 51-40-02;[06] FORMED INTERCOSTAL; AT FWD CARGO BAY BS440 LBL24 WITH MATERIAL( 7075T6 #0.020') LOTE 1489798-1 PER DWG 143A7510 OK TO LOCATE AND DRILL;[07] LOCATED AND DRILLED NEW INTERCOSTAL FWD CARGO BAY BS440-460 LBL24 IAW SRM 51-40-05-0G-0 AND DRAWING 143A7510.<BR>APPLIED CHEMICAL CONVERSION COATING IAW AMM 51-21-41-370-802.<BR>OK TO PRIME;[08] VERIFIED CORRECTIVE ACTIONS #4; #5; #6; #7.<BR>VERIFIED OK TO PRIME.;[09] APPLIED PRIMER TO NEW INTERCOSTAL IAW SOPM 20-41-02 OK TO INSTALL;[10] VERIFIED CORRECTIVE ACTION #9.<BR>VERIFIED OK TO INSTALL INTERCOSTAL.;[11] INSTALLED INTERCOSTAL AT FCB BS 440-BS 460; LBL 24 IAW SRM 51-40-02-0G-0 AND DWG#143A7505 REV-A;[12] UPDATED MEASUREMENTS;[13] VERIFIED CORRECTIVE ACTION #11.<BR>VERIFIED MEASUREMENT TABLE.