Service difficulty report · Beam · Boeing 7377BD

Difficulty date
February 24, 2023
Submitted
April 3, 2023
Operation
Air carrier
Aircraft
N556WN
Make and model
Boeing 7377BD
Aircraft serial
33936
Aircraft time
37,398 hours, 21,958 cycles
Part
Beam
Condition
Corroded
Location
Zn 100 Fus Lower
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 PASSENGER CABIN FLOOR BEAM AT BS 986 LBL 43.<[01] CORROSION ON PASSENGER CABIN FLOOR BEAM AT BS 986 LBL 43 FOUND TO BE OUT OF LIMITS DUE TO PREVIOUS BLEND IAW SRM 51-10-02 PAR 9C;08] FABRICATED -1 T-CHORD FROM BAC1505-101474#7050-T76511 LOT#1505572-1; -2 (2EA) ANGLES FROM BAC1490-2811#7075T6 CLAD LOT#1498610-1; -3 (2EA) ANGLES FROM BAC1490-2887#7075T6 CLAD LOT#1504136-1 AND -4 (2EA) STRAPS FROM 7075T6#0.080' CLAD LOT# 1492623-1 IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA# 23-153-000739-WIP1..... OK TO TREAT AND PRIME REPAIR PARTS.;[12] FABRICATED/ LOCATED AND DRILLED 4 EA -8 CORNER FITTINGS AT RBL 7.65(2EA) AND RBL 38(2EA) IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA#23-153-00739-WIP1. OK TO TREAT AND PRIME REPAIR PARTS;[13] VERIFIED CORRECTIVE ACTION 12.;23] FABRICATED STRUCTURAL FILLERS: 2 EA AT LBL 20 AND 2 EA AT RBL 20 FROM 7075T6#0.090' CLAD LOT#1482311-1 AND -9 FILLER AT LBL 3.65 FROM 7075T6#0.071' CLAD LOT#1497836 IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA#23-153-00739-WIP1. OK TO TREAT AND PRIME REPAIR PARTS;[24] FABRICATED 6 EA FILLERS FROM 7075T6#0.020' CLAD LOT#1516841-1 IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA#23-153-00739-WIP1. OK TO TREAT AND PRIME.;[25] FABRICATED 6 EA RADIUS FILLERS FROM 7075T6#0.090' CLAD LOT#1482311-1 IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA#23-153-00739-WIP1. OK TO TREAT AND PRIME.;[29] REPAIRED PER EA 23-153-00739;[30] RII INSPECTION REQUIREMENTS ARE MET.;[31] VERIFIED CORRECTIVE ACTION 29.

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