Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
June 9, 2021
Submitted
July 19, 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
Bs 949
Stage of operation
IN
How discovered
V
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 SKIN DOUBLER AROUND BELLY DRAIN AT AREA AFT OF ACB BS949 BL0 WL174. ; / [01] REMOVED BELLY DRAIN SKIN DOUBLER AT BS949 BL0 WL174 IAW SRM 51-40-02-0G-0; [02] CORROSION DAMAGE ON SKIN DOUBLER AROUND BELLY DRAIN AT AREA AFT OF ACB BS949 BL0 WL174 WAS FOUND TO BE REPAIRABLE BY REPLACEMENT PER SRM 51-10-02-0G-0 PARA 9C; [03] LOCATED; DRILLED; TRIMMED; DEBURRED; APPLIED CHEMICAL CONVERSION COATING AND PRIMERED NEW BELLY DRAIN DOUBLER BS949 BL0 WL174; USING 2024T3 .050' LOT #1453158-1 IAW SRM 51-40-05 AND DWG #147A0040.; [04] VERIFIED LOCATE; DRILL; TRIM; AND DEBURR; VERIFIED APPLICATION OF CHEMICAL CONVERSION COATING AND PRIMER ON NEW BELLY DRAIN DOUBLER BS949 BL0 WL174; IAW SRM 51-40-05 AND DWG #147A0040.; [05] OK TO INSTALL; [06] OK TO INSTALL NEW BELLY DRAIN DOUBLER BS949 BL0 WL174; [07] INSTALLED NEW BELLY DRAIN SKIN DOUBLER AT BS 949 BLO WL174 IAW SRM 51-40-02 AND DWG 147A0040; [08] VERIFIED THE INSTALLATION OF THE NEW BELLY DRAIN SKIN DOUBLER AT BS 949 BLO WL174; [09] REMOVAL AND INSTALLATION OF BELLY DRAIN VALVE WAS ACCOMPLISHED ON CARD TTG8Q003B1F2; [10] REMOVAL AND INSTALLATION OF BELLY DRAIN VALVE WAS ACCOMPLISHED ON CARD TTG8Q003B1F2

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