MD-82
Flight Crew Air Transport Pilot (ATP)
Confusion
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
During takeoff at approximately 130 KIAS; I heard a click followed by the red autothrottle off lights on my FMA; DFGC display went blank; Captain's PFD and ND went blank; FMS went blank; SelCal system started 'dinging' continuously and there was a loud buzzing in both Captain and First Officer headsets. There were no overhead enunciators illuminated. Overhead panel showed all normal; it was not.  I elected to continue the takeoff. During climb we discovered the comm's were both inoperative; both nav 1/2 were inoperative. I switch the DFGC selector to position two approaching 1;000 feet. The First Officer PFD was working but his nav display was selected map and was showing map fail. I transferred control of the airplane to the First Officer. (The autopilot/auto throttles started working after approximately three minutes from switching to DFGC 2 originally it would not engage.   I then tried to determine what was going on. I turned the emergency power on and the buzzing in the radio reduced and we regained comm 1 and my PFD. There was no indication anything was wrong on the overhead annunciator panel. Freq/Volts both left and right were normal. We obviously had issues and we elected to return.  The First Officer declared an emergency; we climbed to a safe altitude and returned for an uneventful overweight landing.  It should be noted that when emergency power was turned off all comm. radio function was lost. Comm. radio 2 started working on downwind and I was able to call Operations and let them know we were returning. Elected not to start APU because I didn't want to drain the battery and I didn't know how that would affect communications. I never did get my nav display back in arc or rose mode and the SelCal continued to go off all the way to the gate. When we switched to external power at the gate the 'dc emergency bus' red off light illuminated.  On the overhead emergency dc bus panel two circuit breakers tripped. VHF nav 1 and FMS-1 NPU.
MD-80 Captain experiences an electrical malfunction approaching V1 and the takeoff is continued. Once airborne control is transferred to the First Officer whose PFD is functional. The Captain has lost his PFD; ND; FMS; DFGC along with autopilot and autothrust. DFGC is switched to position 2; eventually allowing autopilot and autothrust to be engaged and the emergency power is turned on restoring comm 1 and the Captain's PFD. An emergency is declared and the flight returns to the departure airport.