Service difficulty report · Intercostal · Boeing 737

Difficulty date
August 19, 2022
Submitted
September 27, 2022
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 737
Aircraft serial
33855
Aircraft time
57,460 hours, 34,246 cycles
Part
Intercostal
Condition
Corroded
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

CORROSION ON INTERCOSTAL AT STA 294 TO STA 312; WL 208; LBL 10 TO LBL 12. / [01] VERIFIED APPLICABILITY FOR SRM 53-10-51-1A-1<BR>NO DAMAGE IS PERMITTED AT FLOOR BEAM UPPER CHORD UNDER INTERCOSTAL FOR GALLEY HARD MOUNT/ATTACHMENT IAW SRM 53-10-51-1A-1 PARAGRAPH 1.B.(4);[02] REMOVED INTERCOSTAL FROM BS 294 TO BS312; WL 208 PER SRM 51-40-02-0G-0;[03] UPDATED STEPS 1 TO 4.;[04] LOCATED AND DRILLED NEW INTERCOSTAL FROM BS294 TO BS 312; LBL 10; PER SRM 51-40-05-0G-0 AND DWG 141A5600. REQUEST OK TO INSTALL.;[05] CERTIFIED CORRECTIVE ACTION 3 AND 4;[06] VERIFIED CORRECTIVE ACTION #4 OK TO INSTALL;[07] VERIFIED MEASUREMENT FIELD;[08] INSTALLED NEW INTERCOSTAL FROM BS294 TO BS312; LBL 10; PER SRM 51-40-02-0G-0 AND DWG 141A5600.;[09] CERTIFIED CORRECTIVE ACTION 8;[10] STEPS 1-4 COMPLETE;[11] VERIFIED INSTALLATION OF INTERCOSTAL;[12] VERIFIED ALL STEPS COMPLETE