Flight crew reported a TAT probe malfunction led to the loss of numerous flight instruments and both EECs on both engines. The flight crew performed an air turn back and landing at the departure airport.
Synopsis
Flight crew reported a TAT probe malfunction led to the loss of numerous flight instruments and both EECs on both engines. The flight crew performed an air turn back and landing at the departure airport.
Narrative
FO (First Officer) was PF (Pilot Flying). On takeoff; shortly after rotation and main gear liftoff; we received 'TAT Probe' EICAS message with associated Master Caution. SPD mode on FMA went blank. We both verified all three airspeed indicators and concluded all three were indicating correctly. A few moments later; we received 'L ENG EEC' and 'R ENG EEC' EICAS messages. At selection of VNAV; we received 'Autothrottle Disconnect' EICAS message. We then received an 'FMC Message' EICAS and noticed fuel prediction and ETA times on FMC Progress Page were blank. I immediately asked for radar vectors for a return to ZZZ. FO continued as PF and did an excellent job of maintaining aircraft control while I continued the PM (Pilot Monitoring) duties. After discussing our options; we both agreed returning back to ZZZ was the safest course of action; especially not knowing what other aircraft system we could lose. While receiving extended vectors for the ILS XXL; we accomplished all Normal Checklists; contacted Dispatch; and accomplished the corresponding QRH procedures. I decided I would do the landing in the event other system would malfunction during the approach. ILS approach and landing were normal and uneventful.
Second reporter narrative
I was FO (First Officer) and PF (Pilot Flying). On takeoff; shortly after rotation and main gear liftoff; we received 'TAT Probe' EICAS message with associated Master Caution. SPD mode on FMA went blank. We both verified all three airspeed indicators and concluded all three were indicating correctly. A few moments later; we received 'L ENG EEC' and 'R ENG EEC' EICAS messages. At selection of VNAV; we received 'Autothrottle Disconnect' EICAS message. We then received an 'FMC Message' EICAS and noticed fuel prediction and ETA times on FMC Progress Page were blank. Captain immediately asked for radar vectors for a return to ZZZ. I continued as PF (Pilot Flying) while Captain continued the PM (Pilot Monitoring) duties. After discussing our options; we both agreed returning back to ZZZ was the safest course of action. While receiving extended vectors for the ILS XXL; we accomplished all Normal Checklists; contacted Dispatch; and accomplished the corresponding QRH procedures. Captain decided to do the landing in the event other system would malfunction during the approach. ILS approach and landing were normal and uneventful.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.