What was found
(CAN) FLAP FAIL ON APPROACH. FLAPS AT ZERO, SELECTED TO 8 AND RECEIVED FLAP FAIL MESSAGE. THERE WAS NO MOVEMENT OF THE FLAPS AT 3000 FT WITH AN OAT OF 8 DEGREES SPEED 195 KNOTS. CRUISE ALT FOR FLIGHT WAS FL 350 AND THEY WERE THERE FOR APPROX 1.5 HRS AND OAT APPROX -52 AT THAT ALT WEATHER AT DEPARTURE WAS 14 AND BROKEN CLOUD. FLIGHT CREW CONTINUED THEIR APPROACH, LANDING SAFELY WITH FLAPS AT 0 DEGREES. AN EMERGENCY WAS DECLARED AND EMERGENCY VEHICLES DID MEET THE ACFT AFTER LANDING. MX TROUBLESHOOTING HAS LED TO THE FOLLOWING REPAIRS: RT NR 4 FLAP ACTUATOR REPLACED DUE TO FAILED TORQUE CHECK (SEIZED). RT NR 3 FLAP ACTUATOR REPLACED DUE TO FAILED TORQUE CHECK. R & R NR 2 FLAP ACTUATOR REPLACED DUE TO NOT ACCEPTING GREASE.