Service difficulty report · Beam · Boeing 7378H4

Difficulty date
February 23, 2023
Submitted
March 20, 2023
Operation
Air carrier
Aircraft
N8528Q
Make and model
Boeing 7378H4
Aircraft serial
36927
Aircraft time
19,732 hours, 9,567 cycles
Part
Beam
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 RBL 25; RBL 50; WL 208.<CUTOUT DAMAGE FLANGES OF THE UPPER CHORD OF THE FLOOR BEAM ON BS 947.5 FROM LBL58.60 TO RBL58.60 IAW SRM 53-70-51-2R-5 STEP 4.C.(1)FLAP PEEN ON THE FLOOR BEAM AT BS 947 FROM LBL58.60-RBL58.60 IAW SRM 53-70-51-2R-5 STEP 4.C.(3)FABRICATED REPAIR PARTS; LOCATED; DRILLED; DEBURRED APPLIED CHEMICAL CONVERSION COAT AND PRIMED NEW AND EXISTING PARTS BS947; LBL 58.6-RBL58.6; WL 208 ITEM (1) T-CHORD 2EA. MATERIAL USED BAC1505-101045 7075T6511 LOT# 1506006-1; ITEM (2) ANGLE 2EA. MATERIAL USED BAC1490-2885 7075T62 LOT#1508729-1; FLAP PEENING EDGES OF THE NEW T-CHORD USING FLAP PEEN TOOL ID: E8288 S/N: K3 CAL DUE: 10/2023 APPLIED ALODINE AND PRIMED ALL I.A.W SRM 53-70-51-2R-5 REP. 5 ALT.2. PAR 4C(3); 4.E-K INSTALLED 100% TEMP. AND PERMANENT FASTENER WITHIN SEALANT SQUEEZE-OUT TIME AT BS947; LBL 58.6-RBL58.6; WL 208 BMS-5-95 TYP 1 C20 USED APPLIED AT 01-MAR-2023 22:48 UTC I.A.W SOPM 20-50-19 AND SRM 53-70-51-2R-5 REP. 5 ALT.2. PAR 4.L;[16] VERIFIED CORRECTIVE ACTION STEP 15.;[17] FABRICATED ITEM 3 STRAP(2EA) AND ITEM 4 FILLER (6EA) LOCATED; DRILLED; DEBURRED APPLIED CHEMICAL CONVERSION COAT AND PRIMED MATERIAL USED 7075T6 0.125' LOT#1469335-1 ALL I.A.W SRM 53-70-51-2R-5 REP. 5 ALT.1. PAR. 4.E-K. LOCATED AND DRILLED ITEM 5 CLIP(4EA) AND ITEM 6 CLIP (4EA)

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