What was found
EN ROUTE FROM SEA TO MSP AIRCRAFT MADE UNSCHEDULED LANDING AT BIL. NR 3 FUEL TANK UNABLE TO CROSS-FEED FROM NR 1 OR NR 2 FUEL TANKS. FOUND NR 3 FUEL TANK CROSS-FEED SELECTOR SWITCH KNOB DEFECTIVE. KNOB WAS INDEXED 90 DEGREE OFF, WHEN SET TANK TO ENGINE X-FEED VALVE OPEN. WHEN SET TO X-FEED VALVE WAS CLOSED. REPLACED CROSSFEED SWITCH KNOB, VALVE OPERATES NORMALLY. OPS CHECKS GOOD PER MM 28-22-11. (M)