Service difficulty report · Beam · Boeing 7377H4

Difficulty date
September 24, 2022
Submitted
November 9, 2022
Operation
Air carrier
Aircraft
N201LV
Make and model
Boeing 7377H4
Aircraft serial
29854
Aircraft time
59,586 hours, 35,374 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 STA 328 FLOOR BEAM AT RBL 42 AND RBL 55; WL 208. / [01] SRM 53-10-51-0I-2 IDENTIFICATION 2 AND SRM 53-10-51-1A-1 ALLOWABLE DAMAGE 1 ARE APPLICABLE TO THIS A/C;[02] REMOVED CORROSION ON THE FLOOR BEAM UPPER FLANGE OF BS 328 AT RBL 42 AND RBL 55; WL 208 IAW SRM 51-10-02. MAX. MATERIAL IN AREA OF 5.7'LX1.1'WX0.035'DEPTH FOUND TO BE OUT OF LIMITS DUE TO NO SRM ALLOWABLE DAMAGE ON THE PREVIOUS REPAIR. THE STRUCTURAL ITEM REQUIRED TO REFMOVE AND REPLACE IAW SRM 51-10-02 PAR 9C;[03] VERIFIED CORRECTIVE ACTIONS 1 AND 2 AND MEASUREMENT TABLE.;[04] REMOVED PREVIOUS REPAIR (UPPER T-CHORD AND REPAIR SPLICES ) FROM BS 328 FLOOR BEAM WL 208 BETWEEN BL 0 AND RBL 64 IAW SRM 53-10-51-2R-7 REPAIR 7;10] FABRICATED NEW -1 T-CHORD FROM BAC1505-100224 7050-T76511 EXTRUSION LOT # 5048264 ; FABRICATED -2 REPAIR ANGLE FROM BAC1490-2811 7075T6 CLAD FORMED ANGLE 0.071' LOT # 1502507-1 ; AND FABRICATED -3 ANGLE FROM BAC1490-2900 7075-T6 CLAD FORMED ANGLE 0.080' LOT # 1495938-1 ; LOCATED AND DRILLED ALL REPAIR PARTS IAW SRM 53-10-51-2R-7 REPAIR 7 ; OK TO TREAT AND PRIME;[14] INSTALLED ALL REPAIR PARTS AT STA 328 FLOOR BEAM BETWEEN BL 0 AND RBL 64 WL 208 IAW SRM 53-10-51-2R-7 REPAIR 7;[15] INSPECTED ACTION 14;[16] INSPECTION COMPLETE

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