Service difficulty report · None · Boeing 7377H4

Difficulty date
August 18, 2022
Submitted
September 27, 2022
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
57,460 hours, 34,246 cycles
Part
None
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; FLOOR BEAM UPPER CHORD; BS 986.5; LBL 45 TO RBL 45; WL 208 / [01] UPDATED MEASUREMENTS CHART;[02] REMOVED CORROSION ON FLOOR BEAM UPPER CHORD; BS 986.5; LBL 43 L=1.6'XW=0.9'XD=.025; BS 986.5 LBL 41 L=.9XW=.9'XD=.020'; BS 986.5 LBL 38 L=1'XW=.8'XD=.013'; BS986.5 LBL 35 L=1.1'XW=.7'XD=.010'; BS986.5 RBL 36 L=1.8'XW=.9'XD=.018'; BS 986.5 RBL 40 L=2.2'XW=1'XD=.020'; BS 986.5 RBL 43 L=1.5'XW=1.0'XD=.018' 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 BAC1518-1211<BR>PIN POINT MICROMETER USED ID:ATS1672 S/N:65092939 DUE:03/2023[14] FABRICATED 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;20] LOCATED AND DRILLED NEW CORNER FITTING FOR INTERCOSTAL BS986 RBL38 I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2 PAR. 4.G-L;[21] VERIFIED CORRECTIVE ACTION #19;20 DVI TRIMMED AREA COMPLETED. OK TO PRIME GIVEN.;[22] INSTALLED 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;

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