What was found
AFTER SELECTING GEAR DOWN, MAIN GEAR EXTENDED NORMALLY. NOSE GEAR LAGGED ABOUT 2 SECONDS BEHIND MAIN GEAR, BUT DID EXTEND PROPERLY. MAIN GEAR WAS DOWN AND LOCKED. NOSE GEAR WAS STILL IN TRANSITION. LANDING UNEVENTFUL. REMOVED FROM SERVICE. PERFORMED OPS TEST OF L/G PRIMARY EXTENSION AND RETRACTION. FOUND MAIN GEAR ON EXTENSION DOWN IS 8 SECONDS AND NOSE GEAR DOWN IN 12 SECONDS. FOUND NLG RETRACTION ACTUATOR BYPASSING. REMOVED NLG RETRACTION ACTUATOR REF Q400 AMM TASK 32-31-46-000-801. INSTALLED NEW NLG RETRACTION ACTUATOR REF Q400 AMM TASK 32-31-46-400-801. GEAR SWINGS FUNCTIONAL TEST GOOD REF Q400 AMM TASK 32-31-00-720-801. RETURNED TO SERVICE.