Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
August 2, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N491WN
Make and model
Boeing 7377H4
Aircraft serial
33867
Aircraft time
53,758 hours, 31,898 cycles
Part
Intercostal
Condition
Corroded
Location
Bs 868
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 AFT CARGO BAY BS868 LBL11 WL161. ; / [01] EVALUATED CORROSION; FOUND TO BE OUT OF LIMITS DUE TO NO LIMITS IN THE SRM AND REQUIRES REPLACEMENT PER SRM 51-10-02-0G-0; [02] VERIFIED CORRECTIVE ACTION ENTRY 1.; [03] REMOVED INTERCOSTAL BS 867-887; LBL 11; WL 161 PER SRM 51-40-02-0G-0.; [04] RECEIVED INTERCOSTAL FROM HEAT TREAT/FORM PO#832533; [05] VERIFIED CORRECTIVE ACTIN 4. <BR><BR>RECEIVED INTERCOSTAL ON PO#832533-SWA.<BR><BR>PART FORMED AND HEAT TREATED TO T62 CONDITION; [06] LOCATED; DRILLED AND APPLIED CHEMICAL CONVERSION COATING TO INTERCOSTAL AT ACB BS867 - BS887; LBL11; WL161 PER SRM 51-40-05-0G-0; DWG 146A7943 AND AMM 51-21-41-370-802; [07] VERIFIED CORRECTIVE ACTION 6.<BR><BR>LOCATED; DRILLED; AND APPLIED CONVERSION COATING.<BR><BR>OK TO PRIME PARTS.; [08] APPLIED PRIMER TO INTERCOSTAL PER AMM 51-21-72-370-804. OK TO INSTALL; [09] VERIFIED CORRECTIVE ACTION ITEM 8; OK TO INSTALL; [10] INSTALLED NEW INTERCOSTAL AT ACB BS867 - BS887; LBL11; WL161 PER SRM 51-40-02-0G-0 AND DWG 146A7943; [11] VERIFIED CORRECTIVE ACTION ITEM 10; [12] VERIFIED ALL STEPS COMPLETE; [13] RII STEPS COMPLETE; [14] WORKSCOPE COMPLETE

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