Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
June 9, 2021
Submitted
July 15, 2021
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
54,253 hours, 32,244 cycles
Part
Doubler
Condition
Corroded
Location
Fuselage
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 FRAME DOUBLER AT AREA AFT OF ACB BS952 S-19R WL193. ; / [01] REMOVED DAMAGE FROM FRAME DOUBLER BS 952; MATERIAL LOSS MORE THAN 10% FOUND TO BE OUT OF LIMIT PER SRM 53-70-15-1A-1 FIG 103; E. <BR><BR>REMOVED FRAME DOUBLER BS 952; RBL 42 PER SRM 51-40-02.; [02] VERIFIED REMOVED DAMAGE FROM FRAME DOUBLER BS 952; MATERIAL LOSS MORE THAN 10% FOUND TO BE OUT OF LIMIT PER SRM 53-70-15-1A-1 FIG 103; E.; [03] LOCATED; DRILLED; TRIMMED; DEBURRED; APPLIED CHEMICAL CONVERSION COATING AND PRIMERED NEW FRAME DOUBLER BS 952 RBL42; USING 7075T6 .071' LOT #1459410 IAW SRM 51-40-05 AND DWG #147A8122.; [04] VERIFIED LOCATE; DRILL; TRIM; AND DEBUR; VERIFIED APPLICATION OF CHEMICAL CONVERSION COATING AND PRIMER ON NEW FRAME DOUBLER BS 952 RBL42; IAW SRM 51-40-05 AND DWG #147A8122.; [05] OK TO INSTALL FRAME DOUBLER BS 952; STR 19R; WL 193; [06] GAVE OK TO INSTALL FRAME DOUBLER BS 952; STR 19R; WL 193; [07] INSTALLED FRAME DOUBLER BS 952; STR 19R; WL 193 IAW SRM 51-40-02-0G-0; DWG# 147A8122; DWG# 147A8110.; [08] RII FUNCTION VERIFIED INSTALLED FRAME DOUBLER BS 952; STR 19R; WL 193 IAW SRM 51-40-02-0G-0; DWG# 147A8122; DWG# 147A8110.; [09] VERIFIED INSTALLED FRAME DOUBLER BS 952; STR 19R; WL 193 IAW SRM 51-40-02-0G-0; DWG# 147A8122; DWG# 147A8110.

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