Service difficulty report · Intercostal · Boeing 737*

Difficulty date
March 9, 2022
Submitted
March 21, 2022
Operation
Air carrier
Aircraft
N212WN
Make and model
Boeing 737*
Aircraft serial
32485
Aircraft time
56,760 hours, 33,874 cycles
Part
Intercostal
Condition
Corroded
Location
Fwd 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

CORROSION ON FLOOR SUPPORT AT STA 270+14; LBL 12; WL 208.1 / [01] NO SRM FOUND FOR ALLOWABLE DAMAGE ; REPACEMENT OF THE PART IAW SRM 51-10-02-0G-0 STEP 9;[02] CERTIFY;[03] VERIFIED CORRECTIVE ACTION 1;[04] COMPLETED STEPS 1; 5; AND 8;[05] COMPLETED STEP 2;[06] ALL REMOVALS DONE PER SRM 51-40-02-0G-0;[07] LOCATING AND DRILLING ACCOMPLISHED IN STEP 2 DONE PER SRM 51-40-05;[08] VERIFIED COMPLETION OF STEPS 1; 2; 5; AND 8 AND CORRECTIVE ACTIONS 4-7.;[09] COMPLETED STEP 3;[10] COMPLETED STEP 3; OK TO INSTALL;[11] COMPLETED STEP 6.;[12] COMPLETED STEP 6. OK TO INSTALL;[13] COMPLETED STEP 9 OK TO INSTALL;[14] COMPLETED STEP 9;[15] VERIFY APPLICABILITY FOR SRM 51-40-02-0G-0.;[16] CORRECTION TO STEP 15. <BR>NO APPLICABILITY STATEMENT NEEDED.;[17] UPON FURTHER INVESTIGATION BEFORE COMPLETING INSTALLATION OF INTERCOSTAL AT BL 0 BS270 TO 294.5 WAS FOUND CRACKED AND NEEDS TO BE REPLACED.<BR>LOCATED AND DRILLED NEW INTERCOSTAL AT BS 270 TO 294 BL 0 PER SRM 51-40-02 AND DWG 141A5400.<BR>REQUEST OK TO INSTALL.;[18] VERIFIED CORRECTIVE ACTION #17.<BR>VERIFIED OK TO INSTALL.;[19] UPDATED STEPS 4;7 AND 10.;[20] CERTIFIED;[21] COMPLETED CORRECTIVE ITEM 18 COVERED<BR>BY STEP 10 INSTALLED INTERCOSTAL BS 277-294 BL 0 WL 204-208 PER SRM 51-40-02 AND DWG 141A5400. PER;[22] COMPLETED STEP 4 AND 7;[23] VERIFIED COMPLETE;[24] CHECKED PARTS REQUIREMENT;[25] CORRECTED P/N IN MEASUREMENT TABLE FROM A U3 TO A -3;[26] CERTIFY