B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
Descending we leveled off at 17000. We had a brief loss of all screens and when they returned many EICAS messages. The auto pilot disengaged as did the auto throttles; LNAV and loss of Galley power and the entertainment system in back of the aircraft. We (crew) had no idea what we experienced but thought it was a momentary spurious signal.Descending on base to final with everything back up and running; autopilot; auto throttles and LNAV we were cleared approach. I pushed the approach button on MCP and all screens went blank momentarily and came back. Again multiple EICAS messages followed by everything again returning to normal. The autopilot; auto throttles again were off. I immediately called for gear down on base to make sure we would get it down and hand flew to touch down and full stop; uneventful.Upon taxi into chalks we noticed 5 Status messages:T-R UNITL ENG EEC C1NOSE A/G DISAGREAIR/GND DISAGREEAFT EQ EXH FAN 2We waited for the maintenance troops to arrive and explained the inflight events. Needed their guidance on how to make Logbook write up.Emergency was not declared because all systems came back.
About five hours into the flight when I went on my break the Inflight Service Manager (ISM) told me that Galley #2 power light was cycling on and off. The actual galley power seemed to stay on as the coffee makers maintained power. Wifi was inop throughout the flight. Soon after I returned to the cockpit after my break (third break) there was a momentary power interruption that caused the Autopilot (A/P) and Auto Throttles (A/T) to disengage. The weather radar also was cycled on to the test mode. At least some of the CRTs blanked. As well as the cabin video screens. All the auto flight systems re engaged normally. The First Officer (FO) returned to the cockpit and resumed Pilot Flying (PF) duties. On engaging APP MODE another power disruption occurred which caused the A/P and A/T to disengage. Also all four CRT screens blanked. All systems came back on line and the FO hand flew from here. All systems worked normally for the remainder of the approach; landing; and taxi in. The [Relief Officer] mentioned that the Utility buses had kicked off at the time of the power interruption.
B767 flight crew reported momentary loss of all instrument screens and many EICAS messages.