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 G-4 HARDPOINT INTERCOSTAL AT VBS 997 RBL 7 WL 208.<[01] SRM 53-70-51-1A-1 IS APPLICABLE ALLOWABLE DAMAGE; UPDATED TABLE;[02] REMOVED G-4 FWD I/B FITTING COMMON TO INTERCOSTAL STA 996; RBL 8 ; WL 208 FOR ACCESS PER SOPM 20-50-01.;[03] REMOVED CORROSION ON G-4 HARDPOINT INTERCOSTAL AT STA 997; RBL 7; WL 208 PER SRM 51-10-02-0G-0. AREA BLENDED IS 2.5' BY .750'.;[04] VERIFIED CORRECTIVE ACTIONS 1 AND 3.;[05] MAX MATERIAL REMOVED WAS .012' FROM .080'. OUT OF LIMITS PER SRM 53-70-51-1A-1-.;[06] VERIFIED CORRECTIVE ACTION 5.;[07] REMOVED DAMAGE INTERCOSTAL AT BS986-BS1006 WL208-202 RBL7 I.A.W SRM 51-40-02-0G-0;[08] LOCATED AND DRILLED NEW INTERCOSTAL AT BS986-BS1006 WL208-202 RBL7 I.A.W SRM 51-40-05-0G-0 AND BOEING DWG 147A5733 OK TO INSTALL.;[09] VERIFIED CORRECTIVE ACTION 8. OK TO INSTALL.;[10] INSTALLED NEW INTERCOSTAL AT BS986-BS1006 WL208-202 RBL7 I.A.W SRM 51-40-02-0G-0 AND BOEING DWG 147A5730;[11] INSTALLED G-4 FWD I/B FITTING COMMON TO INTERCOSTAL STA 996; RBL 8; WL 208 AND BOEING DWG 147A5730;[12] VERIFIED CORRECTIVE ACTION 11;[13] VERIFIED CORRECTIVE ACTION 10;[14] COMPLETED R&R TASK I.A.W SRM 51-40-02-0G-0 AND BOEING DWG 147A5730;[15] UPDATED PARTS TABLE;[16] VERIFIED MEASUREMENTS.

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