Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
June 21, 2023
Submitted
July 19, 2023
Operation
Air carrier
Aircraft
N8543Z
Make and model
Boeing 7378H4
Aircraft serial
63587
Aircraft time
19,500 hours, 9,726 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 FLOOR BEAM UPPER FLANGE BS 947 LBL 25 AND LBL 50 WL 208.<[01] VERIFIED APPLICABILITY OF SRM 53-70-51-1A-1 ALLOWABLE DAMAGE [12] CORRECTION ACTION: FABRICATED REPAIR PARTS ITEM(1) T-CHORD 2EA FROM BAC1505-101045 7075T6 LOT #1522472-1; ITEM(2) ANGLE 2EA FROM BAC1490-2885 7075T62 LOT #1495781-1 AND ITEM 3 STRAPS 2EA FROM 7075-T6 0.125' LOT#1515904-1; LOCATED; DRILLED; FLAP PEENING CUT EDGE OF THE UPPER EXISTING CHORD AND NEW T CHORD; APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON REWORKED AREAS AND NEW PARTS ALL I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.C(3);4.D-J TOOL USED E8288 S/N K3 DUE 10/2023. OK TO INSTALL REPAIR PARTS17] FABRICATED ITEM 4 FILLER(6EA) FROM 7075-T6 0.125' LOT#1515904-1; APPLIED CHEMICAL CONVERSION COAT AND PRIMED ALL I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.D-K OK TO INSTALL.;;[23] LOCATED AND DRILLED NEW INTERCOSTAL ATTACH CLIPS (6EA)147A5665-1(2EA);-2(1EA);-3(1EA);-5(1EA);-7(1EA) SUPPLIED BY COSTUMER AND TRIMMED FWD EDGE OF THE INTERCOSTAL LBL AND RBL 51;LBL AND RBL 24 ALL I.A.W SRM 53-70-51-2R-5 REPAIR 5 PAR 4.F-K OK TO INSTALL;[25] INSTALLED BS 947 FLOOR BEAM UPPER CHORD FLANGE REPAIR LBL 58.6 - RBL 58.6 WL208 ITEM (1) T-CHORD 2EA; ITEM (2) ANGLES 2EA; ITEM 3 STRAPS 2EA; ITEM 4 FILLERS 6EA; AND CLIPS 6EA AT BS 947 LBL 58.6 - RBL 58.6 WL208 PER SRM 53-70-51-2R-5 REPAIR 5;

More about the Boeing 737-8H4