2023-02 · NASA ASRS report 1978753
Flight Crew reported multiple differences between Captain's and First Officer's PFDs. The flight crew consulted Maintenance Control; diverted; and made precautionary landing.
During cruise flight at 34;000 ft.; the right Primary Flight Display (PFD) shared a sudden airspeed trend vector increase. I compared my PFD to the Captain's PFD and they did not match. The Captain's showed no airspeed trend vector increase. We then noticed that the wind had shifted from a headwind component to a tailwind component. My PFD then started showing up to 40 degree nose up and a climb of approximately 2;000 Ft. Per Minute. The Autopilot was still holding straight and level. We then switched the Autopilot to Command A and got in touch with Maintenance Control. They were able to link up to the aircraft and determined that the Right Air Data Inertial Reference Unit (ADIRU) was faulty. We decided to continue on to ZZZ1. Shortly thereafter we noticed amber pitch Indication on both PFDs. Then we noticed that my Heading was approximately 30 Degrees off from the Captain's Side. At this point we got the amber roll indication. The Autopilot kicked off; and we discussed diverting to ZZZ. After discussing with Dispatch; we [requested priority handling] and diverted to ZZZ. On roll out we had a Master Caution Message and had the maintenance light and right IRS fault light indicating.
At cruise FL 340. First Officer (FO) pilot flying (PF). Captain pilot monitoring (PM). Autopilot B in command. Weather and ride ok. Multiple erroneous indications on FO's Primary Flight display (PFD) and related error flags on both PFDs. Captain took control of aircraft. Consulted Dispatch and Maintenance Control. Concluded Air Data Inertial Reference Unit (ADIRU) right Failed. Captain flew manually as neither Autopilot would remain engaged. [Requested priority handling] and best course of action was divert to ZZZ. All other aircraft components normal. Flew normal descent and approach to Runway XXR at ZZZ. Below max landing weight. Normal landing. Multiple Failure Flags upon landing. Taxied to gate.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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