Date: 202108
Local time of day: 1201-1800
Location: ZZZ.ARTCC, US
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Navigational Equipment and Processing
Component problem: Malfunctioning; Failed
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Human factors: Time Pressure; Troubleshooting; Workload; Human-Machine Interface; Confusion; Distraction; Situational Awareness
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: During the enroute climb at approximately FL270 on Aircraft X ZZZ1-ZZZ2 we encountered visible moisture below 10 deg c so I turned on the Cowl Anti ice. Immediately; my PFD red flagged the following; RA; FMS1; flight director and lost my bearing pointer; I took a second to evaluate the situation and quickly realized we were going into RVSM so I notified ATC that we had lost instruments and we needed to descend which we did. We transferred controls on the FCP to the FO (First Officer) side and quickly realized we had lost all pitch modes and the vertical speed wheel. We also noticed the speed knob and heading bug wasn't working. We decided to hand fly and I started communicating with ATC and Dispatch/Maintenance through the ZZZ3 operations. I started to look for possible failures in the QRH that may help explain what we lost and a solution with no success. I decided ZZZ3 was a good diversion airport but still was trying to figure out the problem so we slowed down. After some time looking through the QRH and trouble shooting the FCP I decided it wouldn't be safe to continue to ZZZ2 and into hurricane conditions with the instrument failures we had so I called for the diversion to ZZZ3. We were VMC the whole time so I didn't feel the need to declare an emergency. I notified the FAs (Flight Attendants) about our situation and assured them they were safe and this wasn't an emergency. I made a brief announcement to the passengers that we were diverting for loss of some of our instrumentation. We successfully landed in ZZZ3 called maintenance and did an aircraft swap. I made a passenger announcement both on the plane after landing and at the gate explaining what happened and what they could expect as well as made myself available at the new gate for questions in case anyone needed reassurance. After the plane swap we continued into ZZZ2 without incident.Unknown. Multiple equipment failures. Possible QRH for FCP failures.




Synopsis: Air Carrier Captain reported after turning on engine anti-ice the aircraft lost several functions on the Captain's Primary Flight Display (PFD) and diverted to the nearest suitable airport.