MD-83
Flight Crew Air Transport Pilot (ATP)
Confusion
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Executed Go Around / Missed Approach; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
During climb autopilot and autothrottle both failed. Most DFGS functions froze. Only heading bug and VHF Nav could be used. Aircraft began uncommanded yaw oscillations. Elected not to return due to IFR field conditions; approaching convective weather from the west. Selected ZZZ as the best divert airport for weather conditions; runway length. Upon arrival at ZZZ selected landing gear down but got only 3 red gear indications. Conducted go around. Made emergency gear extension and got 3 green gear lights. Remained in a VFR pattern and returned for landing. Stopped on runway. Maintenance installed gear safety pins and towed the aircraft to the gate.
MD83 First Officer experiences autopilot and autothrottle failures during climb along with most DFGS functions. The crew elects to divert to a suitable airport due to weather at the departure airport. The landing gear fails to extend normally when selected down and a go-around ensues. Emergency gear extension procedures are successful followed by a normal landing.