Date: 201512
Local time of day: 1801-2400
Location: ZZZ.ARTCC, US
Flight conditions: VMC
Weather elements / visibility: Rain
Light: Night
Aircraft: B767-300 and 300 ER
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Cargo / Freight / Delivery
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: EICAS/EAD/ECAM
Component problem: Failed; Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Human-Machine Interface
Anomaly: Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Other / Unknown; Inflight Event / Encounter Other / Unknown
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Overcame Equipment Problem; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Weather; Procedure; Aircraft; Human Factors
Primary problem: Procedure

Narrative: EICAS message right IRS on DC; EICAS display; EICAS on panel; right FMC fail; lost right RMI; right EHSI MAP and Vertical Track (VTK) flags and lower EICAS display blank/top EICAS display in compact display mode. Used left Flight Director (FD) and left instrument source selector dials to regain no flag condition. No emergency or priority condition requested. Amended Release to Read (ARTR) received and copied. Burned off excess fuel enroute to [nearby airport] for landing under max landing weight. Most possible contributing factor was excessive water after rainfall in the aircraft entry way due to main entry door left open during rainfall approximate 45 minute prior to block out. Paper towels had to be put on floor to soak up water before flight. Captain and I did not think this factor until talking [the following] morning in van to [the] airport.

Callback: Reporter stated shortly after takeoff the Captain called out to the First Officer that an EICAS message appeared showing right hand instrument displays had failed. He returned to his seat to help manage the situation. The decision was made to return to departure airport. Unable to dump fuel due to center tank empty; had to burn off excess wing tank fuel in order to land under max weight.Reporter stated that there was a heavy rainfall 30-45 minutes prior to departure. Didn't know if the upper lobe main cargo door was open during the rain; but the main entry door was when he arrived. He found a large amount of standing water in the entry way; on the floor. After they had to returned to their departure airport Maintenance informed him they found several circuit breakers were popped in the lower Electrical Equipment (E/E) compartment affecting various electrical busses.Reporter stated there was also concern among flight crews about excess snow being left on cargo containers during the loading process and melting inside aircraft.



Synopsis: Prior to departure First Officer found excessive amount of water in the main cabin door entryway. During cruise EICAS message appeared showing right hand instrument displays failed. Aircraft returned to departure airport. Maintenance found circuit breakers for various electrical busses popped in the Electrical Equipment (E/E) bay of the B767-300; located below the upper lobe cargo compartment.