What was found
AFTER TAKEOFF AND GEAR RETRACTION, NOSE GEAR FAILED TO INDICATE UP AND LOCKED. AIR NOISE CONFIRMED GEAR NOT UP AND LOCKED. AIRCRAFT RETURNED TO DEPARTURE AIRPORT. INSPECTION CONFIRMED NOSE GEAR WAS FLAT, WITH NO SIGNS OF FLUID LEAKAGE. NITROGEN SERVICING SCHRADER VALVE WITH ORING WAS REPLACED. RESERVICED STRUT WITH FLUID AND NITROGEN. NOSE GEAR WAS OPERATIONALLY RETRACTION TEST GOOD. AIRCRAFT RELEASED FOR FLIGHT WITH NO REOCCURANCE OF PROBLEM. NOTE: THIS AIRCRAFT IS EQUIPPED WITH A NOSE GEAR GRAVEL DEFLECTION SKI.