SDR SWAA2026101975411

Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date: September 9, 2026
Submitted: October 20, 2026
Operation: Air carrier
Aircraft: N8657B
Make and model: Boeing 7378H4
Aircraft serial: 42535
Aircraft time: 39,097 hours, 19,276 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

CORROSION FOUND ON FWD WET AREA FLOORBEAMS AT BS 344, RBL 9, & BS 344, RBL 17, WL 208. CORROSION EVALUATED AND REMOVED FLOORBEAM UPPER FLANGE RBL9 WL208 AND RBL17 1"X1" AREA ORIGINAL MATERIAL THICKNESS IS 0.175" LOWEST MATERIAL THICKNESS IS 0.170" CORROSION FOUND TO BE WITHIN LIMITS. APPLIED CHEMICAL CONVERSION COAT AND PRIMED ALL IAW SRM 53-10-51-1A-1 ALLOWABLE DAMAGE 1.

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