Service difficulty report · Doubler · Boeing 737790

Difficulty date
September 30, 2021
Submitted
November 4, 2021
Operation
Air carrier
Aircraft
N557WN
Make and model
Boeing 737790
Aircraft serial
30166
Aircraft time
66,485 hours, 32,340 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 DOUBLER BS 1016-1040 LBL 6- LBL 9 W/L 306.5 ; / [01] REMOVED CORROSION AT DOUBLER BS.1016+20 TO BS.1040 LBL.5 TO LBL.9 REWORK DIMENSION L:7' X W:3' IAW SRM 51-10--02; [02] REMOVER 5EA RIVETS AT DUOBLER IAW SRM 51-40-02; [03] REMOVED CORROSION AT DOUBLER BS.1016+20 TO BS.1016+23 LBL.5 TO LBL.9 REWORK DIMENSION L:4' X W:33' IAW SRM 51-10--02; [04] CERTIFIED; [05] REMOVED CORROSION AT DOUBLER BS.1016+20 TO BS.1016+23 LBL.5 TO LBL.9 REWORK DIMENSION L:4' X W:3' IAW SRM 51-10--02; [06] CERTIFIED; [07] VERIFIED CORRECTIVE ACTION STEP 5; [08] REQUIRED NDT INSPECTION AT AREA FOR FREE CRACK CONDITION; OPEN HOLE AND UT REMNANT THICKNESS; [09] HFEC INSPECTED DOUBLER BLENDOUT AREA; IAW B737 NDTM P6; 51-00-00 PROC 23. NO CRACKS NOTED. TOOL ID ATS1465; N600; [10] HFEC INSPECTED OPEN HOLES IAW B737 NDTM P6; 51-00-00 PROC 16. NO CRACKS NOTED. TOOL ID ATS1465; N600; TOOL ID ATS1411; MINIMITE; [11] HFEC INSPECTED COUNTERSINKS IAW B737 NDTM P6; 53-30-00 PROC 3. NO CRACKS NOTED. TOOL ID ATS1465; N600; TOOL ID ATS1411; MINIMITE; [12] UT INSPECTED DOUBLER BLENDOUT AREA IAW B737 NDTM P4; 51-00-00 PROC 2. REMAINING MAT. 0.036 TOOL ID ATS2342; E650; [13] VERIFIED DAMAGED REPAIRED PER EA 21-153-02996 REV: A.; [14] VERIFIED DAMAGE REPAIRED PER EA 21-153-02996; REV A