Service difficulty report · None · Boeing 737

Difficulty date
August 18, 2022
Submitted
September 22, 2022
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 737
Aircraft serial
33855
Aircraft time
57,460 hours, 34,246 cycles
Part
None
Part number
147A55068
Condition
Corroded
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; FLOOR BEAM UPPER CHORD; BS 986.5; LBL 45 TO RBL 45; WL 208 / FOUND TO BE OUT OF LIMITS WITH REMAINING THICKNESS OF .125' OF ORIGINAL THICKNESS .150' IAW SRM 53-70-51-0I-1; SRM 53-70-51-1A-1 AND BAC1518-1211FLAP PEENING CUT EDGES OF THE FLOOR BEAM BS986 LBL7-LBL50 AND RBL27-RBL50FABRICATED REPAIR PARTS FOR ITEM 1 T-CHORD(2EA) FROM BAC1505-101474#7050T76511 LOT#1495939-1; ITEM 2 ANGLE(4EA) FROM BAC1490-2811#7075T62 LOT#1498610-1; ITEM 3 ANGLE(4EA) FROM BAC1490-2887#7075T62-C LOT#1490487-1 AND ITEM 4 STRAP(4EA) FROM 7075T6#0.080 CLAD LOT#1492623-1 ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2 PAR. 4.G-M TABLE 201 OK TO INSTALL;[15] RECEIVING CORNER FITTINGS(2EA) FROM FAB & PEN INSP ON P.O#879755-SWA AND FROM SHOT PEEN ON P.O# 879873-SWANSTALLED ITEM 1 T-CHORD(2EA);ITEM 2 ANGLE(4EA);ITEM 3 ANGLE(4EA);ITEM 4 STRAP AND L/H AND R/H SHEAR TIE AT BS986 BL0-LBL50 AND RBL18-RBL50 I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2 PAR. 4.N;O;[23] CORRECTIVE ACTION 22 SHOULD READINSTALLED ITEM 1 T-CHORD(2EA);ITEM 2 ANGLE(4EA);ITEM 3 ANGLE(4EA);ITEM 4 STRAP AND L/H AND R/H SHEARTIE AT BS986 BL0-LBL50 AND RBL18-RBL50 I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2PAR. 4.N;O EXCEPT AREAS WERE T-CHORD IS COMMON TO INTERCOSTAL. DRILLED 4 NEW CLIP P/N 53100011-012 (2EA) AND 53100011-010 (2EA)OBTAINED FROM SOUTHWEST BS986 KIT ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2 PAR. 4.G-M