What was found
RETRACTED GEAR ON DEPARTURE & WE GOT A GEAR UNSAFE RED LIGHT & NOSE WHEEL DOWN & LOCKED GREEN LIGHT. MAIN GEAR RETRACTED NORMALLY. NO OTHER ABNORMAL INDICATIONS. BY THE SOUND & FEEL OF IT, NOSE WHEEL GEAR NEVER UNLOCKED. NORMAL LANDING WITH THREE GREEN & NO RED LIGHT. JACKED ACFT & CYCLED GEAR APPROXIMATELY 25 CYCLES. ALL OPERATION & INDICATIONS ARE NORMAL. CHECKED THE NOSE STRUT EXTENSION LENGTH & IT IS WITHIN SPECIFICATION OF LESS THAN 9.1". CHECKED THE ADJUSTMENT OF THE NOSE GEAR UPLOCK SWITCH & IT IS OKAY. IT WAS DECIDED TO REPLACE THE NOSE GEAR ACTUATOR. REMOVED NG ACTUATOR PN 9912491-3 & SN 0303A. INSTALLED A RENTAL NLG ACTUATOR 9912491-3 & SN 0100. THE ACTUATOR WAS INSTALLED WITH NEW HARDWARE. PERFORMED ALL GEAR CHECKS INCLUDING THE BLOW DOWN CHECK. ALL GEAR OPERATIONAL CHECKS ARE NORMAL IAW MM 32-30-03.