Date: 202104
Local time of day: 1801-2400
Location: ZZZ1.TRACON, US
Flight conditions: VMC
Light: Night
Aircraft: EMB ERJ 145 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Descent
Airspace: Class B ZZZ1
ATC / advisory: TRACON ZZZ1
Aircraft component: AC Generator/Alternator
Component problem: Failed
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Troubleshooting
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: Aircraft X was arriving into the ZZZ1 area from ZZZ before XA:00 pm in night conditions with fair visibility; with one FA (Flight Attendant) and no PAX (passengers) aboard. At perhaps 12 miles southwest of ZZZ2; descending out of 10;000 feet; cleared to 8;000 ft. with the FO (First Officer) as Flying Pilot; several instruments suffered anomalies. The Captain's MFD (DU 2) and FO's PFD (DU 5) became blank; both RMUs (Radio Management Units) displayed all dashes except for Comm indications; and EICAS presented one CAS (Crew-Alerting System) message that I recall - RA 2 (amber). ZZZ1 Approach Control was issuing vectors toward the east and cleared the flight to 7;000 feet and then requested our altitude as they were no longer receiving the Mode C altimeter report. The CA (Captain) advised ATC of our electrical issues. The FP (Flying Pilot) selected PFD on his reversionary panel MFD switch to restore flight instruments for view on his operating DU 4; although the navigation info was unusable with a red X. The CA indicated he could see ZZZZZ; the final approach fix; on his PFD. The CA attempted to find an applicable QRH malfunction but the crew was not presented with an obvious CAS message to troubleshoot. The crew discussed what might be at issue and the CA checked the circuit breakers. Although DC Bus 2 was suspected there was nothing positive to confirm it. The FP accepted a clearance to 5;000 feet while stating to the CA that the aircraft was now clear of the mountains. However the autopilot failed to capture the altitude so the FO disconnected the autopilot and hand flew the remainder of a visual approach to a successful night landing at ZZZ2 runway XXC. At some point south of ZZZZZ the CA advised that we should land the aircraft and figure out the problem on the ground and so we proceeded to configure normally and complete all checklists. The CA concluded that Generator 2 might be at fault and so reset it. His MFD began to restore just prior to landing; and the FO's DU 5 did so during taxi in to the hangar. Maintenance personnel met the aircraft and the possibility of a GCU fault was discussed. Normally a failed generator should be compensated for by the EDL to prevent the loss of flight instruments or displays. The aircraft was handed over to Maintenance for further investigation. This event allowed the crew to demonstrate excellent CRM through coordinated effort; superb communications; and teamwork under the direction of the CA. This approach provided for a calmly executed arrival to the destination. Curiously both crew members had just completed Annual Equipment Exams on the same day sit in ZZZ3. The preparation and study for the review was clearly an advantage to the crew and proved the value of the training.Submitted respectfully;NAMEFirst Officer




Synopsis: First Officer reported that the loss of a generator and the failure of the electrical system to reroute power caused the failure of many cockpit display units and a diversion to a closer airport with maintenance support.