What was found
ALB - AFTER TAKEOFF, THE NOSE GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. EXTENDED GEAR, NORMAL INDICATIONS WERE RECEIVED. ATTEMPTED SECOND RETRACTION AND GEAR LEVER WOULD NOT MOVE. FLIGHT RETURNED TO ALB AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE INSPECTED THE GEAR AND FOUND THE NITROGEN CHARGE IN THE NOSE GEAR LOW. GEAR WAS SERVICED AND RELEASED FOR SERVICE. (M)