Service difficulty report · Floorbeam · Boeing 737890

Difficulty date
May 28, 2024
Submitted
June 25, 2024
Operation
Air carrier
Aircraft
N506AS
Make and model
Boeing 737890
Aircraft serial
35690
Aircraft time
57,193 hours, 17,458 cycles
Part
Floorbeam
Part number
147A550419
Condition
Corroded
Location
Bs 947 Bl0-Lbl58
Stage of operation
IN
How discovered
V
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

AFT WET AREA STA 947 T-CAP HAS CORROSION AT MOUNT FITTING. GROUNDED - YES. REMOVED CORROSION, ORIGINAL THICK 0.1800 IAW B737-800 SRM 53-70-51-1A-1 AND FLOOR BEAM BAC 1518-1212 REMAINING THICK 0.154 AT RBL 53, 0.026" REMOVE MAT, REMAINING THICK 0.158 AT LBL 4, 0.22" REMOVED MAT. FOUND WITHIN LIMITS ALLOWABLE DAMAGE, REMAINING THICK .078" AT LBL 245 0.102 REMOVED MAT FOUND OUT OF LIMITS ALLOWABLE DAMAGE IAW B737-800 SRM 53-70-51-1A-1, CUT OUT DAMAGE STA 947.5 LBL 9 TO LBL 58, FABRICATED 'T' CHORD REPAIR, ANGLES, STRAPS AND FILLERS, AND DRILLED TO FIT NEW CHIPS STA 947.5 BETWEEN 50 LBL TO LBL 52 IAW B737-800 SRM 53-70-51-2R-5 ALTERNATIVE AND SRM 51-40-05; ALODINED FLOOR BEAM RBL 53 TO LBL 58 AND CUT EDGE 'T' CHORD, SPLICE, ANGLES, STRAPS, AND FILLERS; IAW B737-800 SRM 51-20-01; PRIMED FLOOR BEAM RBL 53 TO LBL 58, CUT EDGE, 'T' CHORD, SPLICE, ANGLES, STRAP AND FILLERS IAW BOEING SOPM 20-41-02 AND INSTALLED REPAIR T CHORD, SPLICES, ANGLES, STRAPS, CHIPS AND FILLERS IAW B737-800 SRM 53-70-51-2R-5 ALTERNATIVE 2.