Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
May 22, 2023
Submitted
June 16, 2023
Operation
Air carrier
Aircraft
N8535S
Make and model
Boeing 7378H4
Aircraft serial
63596
Aircraft time
19,603 hours, 9,695 cycles
Part
Floorbeam
Part number
UNKNOWN
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 947 FLOORBEAM AT LBL 26; LBL 44-46; WL 208.<[01] PARTIAL UPDATE STEP 1;16] FABRICATED REPAIR PARTS ITEM(1) T-CHORD 1EA FROM BAC1505-101045 7075T6 LOT #1522472-1;ITEM(2) ANGLE 2EA FROM BAC1490-2885 7075T62 LOT #1508729-1 AND ITEM 3 STRAPS 2EA FROM 7075-T6 0.125' LOT#1469335-1;LOCATED;DRILLED FLAP PEENING CUT EDGE OF THE UPPER EXISTING CHORD AND NEW T CHORD APPLIED CHEMICAL CONVERSION COAT AND REWORKED AREAS AND NEW PARTS ALL I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.C(3);4.D-J<BR>TOOL USED<BR>E8288<BR>S/N K3<BR>DUE 10/2023;[23] FABRICATED; LOCATED; DRILLED; APPLIED CHEMICAL CONVERSION COATING AND PRIMER MATERIAL USED 7075T6 CLAD 0.100' LOT# 1338198-1 ITEM 4 FILLER (5EA) POSITIONS LBL 25; LBL 31; RBL 25; RBL 36; RBL 50; IAW SRM 53-70-51-2R-5 REP. 5 ALT.2. PAR 4.E-K AND OK TO INSTALL.[28] INSTALLED BS947 FLOOR BEAM UPPER CHORD FLANGE REPAIR FROM LBL48-RBL58.6 ITEM 1 T-CHORD(1EA);ITEM 2 ANGLES(2EA);ITEM 3 STRAPS(2EA);ITEM 4 FILLERS(5EA) ALL I.A.W SRM 53-70-51-2R-5 REP. 5 ALT.2. PAR 4 L-M;[29] INSTALLED FASTENER REMOVED FOR ACCESS BS967-BS927 RBL58-LBL58 WL208-WL202 I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.P AND BOEING DWGS 147A5650.147A8501;[30] VERIFIED CORRECTIVE ACTION 26-29.;[31] PARTIAL UPDATED STEP 11;APPLIED FILLET SEAL AND PRIMED FASTENER HEAD IN THE RE

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