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SDR ASAA2025091260935

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Service difficulty report · Floorbeam · Boeing 737990ER

FAA SDR system

Difficulty date
September 12, 2025
Submitted
September 18, 2025
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
40,738 hours, 12,607 cycles
System (JASC)
5315 · Fuselage Main, Floor Beam
Part
Floorbeam
Part number
147A550616
Condition
Corroded
Location
Zone 200
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, AT STA.986.5 AND RBL.43 UPPER CHORD OF FLOOR BEAM HAS A CORRODED FASTENER HOLE. GROUNDED - YES. REMOVED DAMAGE IAW B737-900ER SRM 53-70-51-2R-6 PERFORMED HFEC CUT AND MAT. ID, ROTO PEEN, HEAT TREATED, FABRICATED, APPLIED PROTECTIVE TREATMENT AND INSTALLED DOUBLER, STRAP, AND FILLER IAW B737-900 SRM 53-70-51-2R-6, CATEGORY A REPAIR.