Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
January 25, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 cycles
Part
Intercostal
Condition
Corroded
Location
Zn 200 Fus Top
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 FWD PASSENGER CABIN INTERCOSTAL AT LBL 11 BS 294+13.<[01] VERIFIED APPLICABILITY FOR SRM 53-10-51-1A-1.<BR>REMOVED CORROSION ON FWD. PASSENGER CABIN INTERCOSTAL AT LBL 11 BS 294+13 WL 208 L: 2' W: 2' D: .035'. FOUND INTERCOSTAL TO BE OUT LIMITS PER SRM 53-10-51-1A-1. USED TOOL ID ATS2473 S/N: UNKNOWN DUE: 08/2023.;[02] CERTIFIED CORRECTIVE ACTION 1;[03] VERIFIED CORRECTIVE ACTION #1;[04] REMOVED FWD. PASSENGER CABIN INTERCOSTAL AT LBL11; BS294 - BS312 PER SRM 51-40-02-0G-0 PART WILL BE REPLACED REPLACEMENT PART PER SRM 51-10-02 STEP 9.;[05] LOCATED AND DRILLED NEW PASSENGER CABIN INTERCOSTAL P/N 141A5690U1 LOT# 1513679-1 AT LBL11; BS294 - BS312 PER SRM 51-40-05-0G-0 AND DWG 141A5600. OK TO INSTALL;[06] VERIFIED CORRECTIVE ACTION #5;[07] UPDATED STEPS 1; 2 AND 3;[08] INSTALLED NEW PASSENGER CABIN INTERCOSTAL AT BS294 - BS312; LBL11; PER SRM 51-40-02-0G-0 AND DWG 141A5600;[09] CERTIFIED CORRECTIVE ACTION 7 AND 8;[10] VERIFIED CORRECTIVE ACTION ITEM 8.;[11] UPDATED STEPS 1; 2 AND 3;[12] CERTIFIED CORRECTIVE ACTION 11;[13] STEPS 1;2;3 ARE COMPLETED.;[14] UPDATE P/N

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