Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Critical; Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Took Evasive Action; General Flight Cancelled / Delayed; General Maintenance Action
Human Factors; Aircraft; Procedure
At about 5000 ft. near ZZZZZ on approach into ZZZ; after an emergency turn back en route to ZZZ1 for dual EEC failures and Display Source indicating on captain's side PFD; we got a traffic call from ATC. I slowed my descent as the target on my screen was getting closer. At that time ATC canceled our approach clearance and turned us right. Seconds later we got a RA to climb so I climbed about 500 ft. to avoid the traffic; which the PM (Pilot Monitoring) saw visually in our climbing turn. Eventually the passing traffic moved behind us and we were re-issued an approach clearance for the visual approach to [Runway] XXL at ZZZ. We landed uneventfully and taxied safely to the gate; whereupon the flight was cancelled due to the engine EEC failures.
At approximately 5;000 ft. MSL; near ZZZZZ on the RNAV Z XXL into ZZZ; received an RA to climb and turn right. PF (Pilot Flying) had noted approaching traffic and ZZZZ1 had just issued a level off and cancellation of our approach clearance; which PNF (Pilot Not Flying) was repeating when RA sounded. PNF gained visual of small aircraft as we were in the turn and estimates RA was successful in avoiding the 500 ft. near midair bubble but would have certainly been such without evasive action. Reported RA to ZZZZ1. Cleared for visual approach and landed with no further event.  Additional Controllers for this airspace. Too congested.
Flight Crew reported a TCAS TA and RA on approach to landing after an air turn back caused by a dual EEC failure. The flight crew initiated evasive action and was vectored back to the approach.