Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
July 31, 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 932
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 BS932 RBL13 WL170. ; / [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 1 PER SRM 51-10-02-0G-0; [03] REMOVED INTERCOSTAL; BS 927-947; RBL 13; WL 170 PER SRM 51-40-02-0G-0.; [04] RECEIVED INTERCOSTAL FROM HEAT TREAT/FORM PO#832537; [05] VERIFIED RECEIVED INTERCOSTAL FROM HEAT TREAT/FORM PO#832537; [06] LOCATED; DRILLED AND APPLIED CHEMICAL CONVERSION COATING TO INTERCOSTAL AT ACB BS947 - BS927; RBL13; WL170 PER SRM 51-40-05-0G-0; DWG 147A7500 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 PART.; [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 BS947 - BS927; RBL13; WL170 PER SRM 51-40-02-0G-0 AND DWG 147A7500; [11] VERIFIED CORRECTIVE ACTION 10; [12] VERIFIED JOB COMPLETED

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