Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
April 21, 2023
Submitted
May 16, 2023
Operation
Air carrier
Aircraft
N8534Z
Make and model
Boeing 7378H4
Aircraft serial
63578
Aircraft time
19,732 hours, 9,539 cycles
Part
Floorbeam
Condition
Corroded
Location
Zn 200 Fus Top
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 947 FLOORBEAM UPPER SURFACE AT RBL 27; WL 208.<OUT LIMITS DUE TO LOSS OF MATERIAL EXCEED LIMITS GIVEN PER SRM LBL52 0.750'X0.600' ORIGINAL MATERIAL THICKNESS IS 0.180' REMAINING MATERIAL THICKNESS IS 0.110' ALL I.A.W SRM 53-70-51-1A-1REMOVED ADJACENT STRUCTURE I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.A(1) AND SRM 51-40-02-0G-0;[04] VERIFIED CORRECTIVE ACTION ITEMS 1 AND 2.;[05] REMOVED DAMAGE FLANGES OF THE UPPER CHORD OF THE FLOOR BEAM BS947 FROM RBL41-LBL58.60 I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR.4.C;FABRICATED REPAIR PARTS ITEM(1) T-CHORD 1EA FROM BAC1505-101045 7075T6511 LOT # 1522472-1; ITEM(2) ANGLE 2EA FROM BAC1490-2885 7075T6 LOT #1493588-1 AND ITEM 3 STRAPS 2EA FROM 7075-T6 0.125' LOT#1275906;LOCATED;DRILLED FLAP PEENING CUT EDGES OF THE NEW T CHORD APPLIED CHEMICAL CONVERSION ] INSTALLED REPAIR PARTS ITEM (1) T-CHORD 1EA; ITEM (2) ANGLE 2EA ITEM 3 STRAPS 2EA AND ITEM 4 FILLERS 5EA ;REINSTALLED FLOOR SUPPORT EXISTING CLIPS TO BE RE-USED DUE TO FLOOR SUPPORT COMMON TO REPAIR TO BE REPLACED ALL I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.L;[19] UPDTAED STEPS 1-11. VERIFIED INSTALLATION OF THE BS947 FLOOR BEAM REPAIR PER SRM 53-70-51-2R-5 REPAIR 5 PAR 4.L;[20] UPDATED STEPS 1-11 AND CORRECTIVE ACTION 18- VERIFIED INSTALLATION OF THE BS947 FLOOR BEAM REPAIR PER SRM 53-70-51-2R-5 REPAIR 5 PAR 4.L;[ COMPLETED REPAIR ON BS 947 FLOORBEAM UPPER SURFACE FROM RBL50-LBL58.8 WL208 I.A.W SRM 53-70-51-2R-5 REPAIR

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