B777 Flight Crew reported an engine over temp indication resulted in engine shutdown and diversion.
Synopsis
B777 Flight Crew reported an engine over temp indication resulted in engine shutdown and diversion.
Narrative
I was on my break. The purser woke me up and told me that I was needed in the cockpit. I saw that we had offset 5 miles right of course and I was told of the problem. The L ENG OH checklist had been accomplished. When the left throttle was reduced to idle; the L ENG OH message went away. We were between ZZZZZ and ZZZZZ1 on the D track to ZZZ Airport. We [requested priority handling] and received clearance to descend to FL310 and then turn left and proceed directly to ZZZ1 Airport. We made a radio call on XXX.XX stating our position and our planned descent. The L ENG OH checklist came on again on the EICAS. We did the checklist again and this time; when the throttle was reduced to idle; the message did not disappear. We continued the checklist and shut down the left engine. We got clearance to FL200 and we flew directly to ZZZ1 Airport. We communicated with Dispatch; ZZZ Radio; the Flight Attendant's (FA) and made a PA to the passengers. We were given priority vectors to Runway XXR and landed uneventfully. We taxied clear of the runway and had the Fire Chief look over the plane concentrating on the left engine. We then taxied to Gate XX and shut down.Cause: The L ENG Fire Loop has apparently been replaced 3 sequences prior to our flight. My guess is that it was not completed properly.Suggestions: I don't know how it could have been prevented; but I will say that the training we receive at recurrent is excellent. We performed very well as a team. We discussed things together before executing anything.
Second reporter narrative
At cruise (FL370) as Pilot Monitoring (PM) after coming up from my break about 2.5 - 3 hours into the flight we experienced an L ENG Overheat ICAS message. We followed the checklist and shutdown the #1 engine. We offset to the right of airway for a descent. This happened on [High Route] airway between ZZZZZ and ZZZZZ1 way points. We [requested priority handling] with ZZZ Radio and were given clearance initially to FL310 then to FL200. We were cleared direct to ZZZ1 Airport for a single-engine approach and landing.Cause: This aircraft recently underwent maintenance for a left engine fire detector loop.Suggestions: Continue excellent pilot training in annual simulator events.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.