What was found
RECIEVED A LANDING GEAR WEIGHT ON WHELLS SYSTEM FAIL MESSAGE ON GEAR RETRACTION, DECLARED AN EMERGENCY, AND PERFORMED AN AIR RETURN. ON GEAR EXTENSION THE MESSAGE CLEARED AND THE FLIGHT LANDED WITHOUT INCIDENT. OPERATIONAL TEST WAS PERFORMED IAW AMM 3262-00 TASK 32-62-00 TASK 32-62-00-710-801-A. ALL TESTS CHECKED GOOD. TROUBLESHOT "LG WOW SYS FAIL" DOWN TO NLG SHOCK STRUT SERVICING. PERFORMED FULL SERVICE ON GROUND OF NLG SHOCK STRUT AMM 12-12-07/ CLEAN, LUBED, AND VERIFIED DIMENSIONS OF NLG WOW SENSORS IAW AMM 32-62-01. PERFORMED NUMEROUS GEAR EXTENSION/RETRACTIONS IAW AMM 32-33-00. NO DEFECTS NOTED, OPS CHECK GOOD. A/C OK FOR SERVICE.