What was found
AFTER TAKEOFF AT 300 FT, 160 KTS, RECEIVED GEAR UP DISAGREE NLG UPON SELECTION OF GEAR MLG UP AND LOCKED CAUTION WOW STATUS MESSAGE WOW OUTPUT FAILED FOLLOWED QRH DECLARED EMERGENCY LANDING UNEVENTFUL LANDING IN ORD. FOUND NOSE LANDING GEAR STRUT RETAIN COLLAR 90 OUT FROM WEAR DISARMED STRUT. INSPECTED FOUND LOWER RET ATN MISSING. REPLACED MINS AND RERACKED STRUT IAW 37-21-00 AND 32-21-15. NO DEFECTS NOTED. (M)