What was found
(CAN) DURING REQUIRED ANNUAL INFLIGHT MANUAL ADG DEPLOYMENT CHECK, AN ABNORMAL SURGING IN VOLTAGE TOOK PLACE ON DEPLOYMENT. A140 STANDBY INST. LIGHTING A150 STICKPUSHER A150 L/H CHANNEL SPS. A159 & CHANNEL ANNUNCIATOR A160 10 CHANNEL ANNUNCIATOR B184 OBSERVERS AUDIO, C15 PITCH TRIM CHANNEL, AND C29 IRU NR 1 D45 EFIS SYMBOL GENERATOR CIRCUIT BREAKERS TRIPPED. AS A PRECAUTION CREW DECLARED AN EMERGENCY AND A NORMAL LANDING WAS MADE AT BASE. THE ADG VOLTAGE REGULATOR WAS REPLACED WITH A SERVICEABLE UNIT, AND DMAGED ELECTRICAL COMPONENTS CHANGED. ANOATHER FLIGHT TO CHECK ADG OPERATOR WAS CARRIED OUT WITH ALL SYSTEMS NORMAL.