Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
May 2, 2023
Submitted
June 1, 2023
Operation
Air carrier
Aircraft
N285WN
Make and model
Boeing 7377H4
Aircraft serial
32536
Aircraft time
51,630 hours, 31,054 cycles
Part
Intercostal
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 LAV A FLOOR MOUNT INTERCOSTAL BS 301 LBL 11 WL 208.<[01] SRM 53-10-51-1A-1 IS APPLICABLE ALLOWABLE DAMAGE; UPDATED TABLE;[02] REMOVED CORROSION ON LAV A FLOOR MOUNT INTERCOSTAL STA 301; LBL 11; WL 208 PER SRM 51-10-02-0G-0. AREA BLENDED IS 2' BY 2' WITH 100% MATERIAL LOSS. OUT OF LIMITS PER SRM 53-=10-51-1A-1.;[03] VERIFIED CORRECTIVE ACTIONS 1 AND 2.;[04] CHANGED POTENTIAL CORROSION LEVEL TO LEVEL 1 ON STEP 21 OF THE TABLE;[05] CERTIFIED;[06] VERIFIED MEASUREMENTS TABLE;[07] REMOVED FASTENERS (8) AT BS 294.5 FOR ACCESS. FASTENERS REMOVED IAW SRM 51-40-02-0G-0.;[08] REMOVED L ANGLE AT BS 294.5; LBL 5 FOR ACCESS AND REMOVAL OF INTERCOSTAL. FASTENERS REMOVED IAW SRM 51-40-02-0G-0.[17] REMOVED INTERCOSTAL BS 294.5 - BS 312; LBL 11 PREVIOUSLY DISPLACED IN CORRECTIVE ACTION 10.;[18] LOCATED AND DRILLED REPLACEMENT INTERCOSTAL AT BS 298.5-312; LBL 11; IAW SRM 51_40-05-0G-0; AND DWG 141A5600; OK TO INSTALL;[19] VERIFIED CORRECTIVE ACTION 18. OK TO INSTALL.;[20] INSTALLED INTERCOSTAL AT BS 298.5-312; LBL 11; IAW SRM 51_40-02-0G-0; AND DWG 141A5600;

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