Date: 201905
Local time of day: 0001-0600
Location: ZZZZ.Airport, FO
Flight conditions: IMC
Weather elements / visibility: Rain
Aircraft: Boeing Company Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Descent
ATC / advisory: Center ZZZZ
Aircraft component: Ice/Rain Protection System
Component problem: Failed; Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Workload; Time Pressure; Situational Awareness; Distraction
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification
Contributing factors: Human Factors; Aircraft; Weather
Primary problem: Aircraft

Narrative: As we were descending into ZZZZ; we received an 'Eng Core Anti-Ice R' EICAS caution. We performed the ECL items which stated to avoid icing conditions. This directive escalated the urgency of our situation as we were already IMC in icing conditions. We were cleared to descend to FL140 and proceed to ZZZZ via the ZZZZZ 2F to hold as published with an EFC. The ATIS indicated moderate to severe icing all holding altitudes. The Captain attempted to push up the power to increase bleed air. This worked temporarily as the EICAS went away. I requested a lower altitude to avoid icing but ATC indicated expedited handling would only be available if we conveyed urgency or emergency authority. I and the [Relief Pilot] advocated to [advise ATC] to get out of the icing conditions. The Captain felt with the EICAS not present; the situation was not yet that urgent so he directed the [Relief Pilot] to Satcom Dispatch and include [Maintenance Control] in on the call. I flew the aircraft and handled ATC while the Captain and [Relief Pilot] conferred with Dispatch and [Maintenance Control]. The decision was made to expedite our arrival to ZZZZ. We had just entered the hold at ZZZZZ when the SATCOM call ended and the Captain made the decision to land immediately. We transferred aircraft control and at the direction of the Captain I conveyed the 'Pan Pan' call to ZZZZ Director to get us out of the icing due to irregular engine indications (as the Captain was not sure ATC would understand our anti-ice systems). We were given vectors out of the holding pattern and when clear of the traffic in the holding stack; we were cleared to descend to FL80. We performed an uneventful CDA approach to [Runway] XXR. Upon landing; we were instructed to contact CFR and were further met at the gate by legal authorities and the In flight Supervisor. We assume either Dispatch or ATC escalated our urgent Pan Pan call.


Second narrative: [Report narrative contained no additional information.]


Synopsis: B787 pilot crew reported a failure of an engine anti-ice system while in icing conditions.