SDR UIEA2026033100117

Service difficulty report · Floorbeam · Boeing 74747UF

Difficulty date: May 23, 2026
Submitted: May 27, 2026
Operation: Air carrier
Aircraft: N477MC
Make and model: Boeing 74747UF
Aircraft serial: 29255
Aircraft time: 108,821 hours, 19,065 cycles
System (JASC): 5315 · Fuselage Main, Floor Beam
Part: Floorbeam
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

U/D RBL 10" TO LBL 28" BS 460 FLOOR SUPPORT FOUND CORROSION(<P>CORROSION AREA REMOVED AS PER SRM 51-10-02 AND REPROTECTED AS PER SRM 51-20-01, MEASURED, ORG 0.063", L : 12" X W:0.9" X D : 0.004" WITHIN SRM 53-00-51-1A-1 ALLOWAGLE DAMAGE 1 FIG 101 LIMITS. NO FURTHER DEFECTS NOTED</P>)

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