Service difficulty report · Stiffener · 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
Stiffener
Condition
Corroded
Location
Bs 1017
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 BULKHEAD STIFFENER AT AREA AFT OF ACB BS1017 RBL .5' WL191. MARKED ; / 02] REMOVED CORROSION ON BULKHEAD STIFFENER AT BS 1017 RBL WL191 IN AN AREA L=1.5' W=1' X=.008 WITH .032' ORIGIONAL THICKNESS AND .024 REMAINING. OUT OF LIMITS IAW SRM 53-80-08-1A-1; 04] REMOVED DAMAGED SECTION OF STIFFENER BS 1017 RBL .5' WL191 IAW SRM 51-10-02 AND SRM 51-40-02; [05] VERIFIED STIFFENER DAMAGE WAS CUTOUT AT BS 1017 RBL 0.5 WL191. INSPECTED AREA AND NO ADDITIONAL DAMAGE WAS FOUND PER SRM 51-10-02-0G-0.;[08] STEP 6; ONLY TOOL ID ATS1465; N600 USED FOR INSPECTION; [09] RECEIVED REPAIR SECTION STIFFENER FROM O.S.S PER CUSTOMER RO# 832901-SWA; JOB#541863.<BR><BR>RECEIVED REPAIR U-CHANNEL FROM O.S.S PER CUSTOMER RO# 832902-SWA; JOB# 541864.[12] VERIFIED LOCATED AND DRILLED REPAIR PARTS PER EA# 21-153-02234. APPLIED CHEMICAL CONVERSION COATING PER SRM 51-20-01. OK TO PRIME; [13] OKAY TO INSTALL REPAIR PARTS AT STIFFENER BS 1017 RBL 0.5 WL 191.; [14] REPAIRED PER EA 21-153-02234; [15] VERIFIED REPAIRED PER EA 21-153-02234.; [16] VERIFIED ALL ITEMS COMPLETE. REPAIRED PER EA 21-153-02234.

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