CITATION II HAS AN ELECTRICAL PWR SURGE DURING DEP. ALTIMETERS; AUTOPLT AND PRIMARY COM RADIOS ARE LOST. ACFT PITCHES UP AND FLT CREW REGAINS ACFT CTL USING STANDBY INSTS. NORMAL ELECTRICAL PWR RETURNS; ALL EQUIP IS REGAINED; AND FLT CONTINUES TO DEST. WX NOT A FACTOR.

Narrative

OUR CLRNC WAS TO 'TURN L TO 100 DEGS; MAINTAIN 2000 FT AS FILED; MAINTAIN 2000 FT; FL290 IN 10 MINS; DEP FREQ 124.3; SQUAWK XXXX.' UPON DEP XFER; WE LOST ALL COM; THE ALTIMETERS WENT L SIDE TO FL340; R SIDE TO 0; THE AUTOPLT (WHICH WAS ENGAGED) BECAME DISENGAGED AND THE AIRPLANE DID AN ABRUPT PITCH UP TO 2900 FT. USING THE THIRD ALTIMETER; I TOOK THE AIRPLANE BACK DOWN TO 2000 FT. IN THE MEANTIME; WE HEARD ATC TELLING US TO TURN R HDG 180 DEGS TO INTERCEPT THE 166 DEG RADIAL OFF MAVERICK VOR. WE STILL COULD NOT ANSWER ATC BUT WERE FOLLOWING THEIR COMMANDS. WE REGAINED LIMITED COM ON CAPT'S SIDE; FO'S SIDE REMAINED INOP FOR THE REST OF THE FLT. THIS IS MY RECOLLECTION; AS I REMEMBER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR INDICATED HE HAD NOT ENCOUNTERED THIS ANOMALY BEFORE. THIS WAS A CITATION II WITH OLDER ANALOG INSTRUMENTS (ROUND GAUGES). IT HAS A FLT DIRECTOR ON THE L SIDE AND HAD BEEN RVSM CONVERTED (INDIVIDUAL ADC'S AND DIGITAL ALTIMETERS INSTALLED). THE PRIMARY ATTITUDE INSTRUMENTS WERE NOT LOST; ONLY THE DIGITAL ALTIMETERS. THE STANDBY ALTIMETER WAS USED TO REGAIN ASSIGNED ALT. APPEARS THAT THE BUS SUPPLYING POWER TO THE ADC'S; PRIMARY ALTIMETERS; AND PRIMARY COM WAS MOMENTARILY LOST AND RESPONSIBLE FOR THE ANOMALY.