B767 Undifferentiated or Other Model
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 210; Flight Crew Total 22000; Flight Crew Type 2600
Troubleshooting
Aircraft Equipment Problem Critical; Deviation - Altitude Excursion From Assigned Altitude; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Diverted; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Human Factors
After takeoff from ZZZ climbing through approximately FL220 in night IMC; we got an ALT DISAGREE EICAS message; followed shortly afterwards with a IAS DISAGREE EICAS message. During the climb the Captain's and FO's altimeters disagreed by several hundred feet; and the airspeed indicators by up to 15 knots. We leveled off at FL310 to evaluate the situation. At FL310; the airspeed disagree EICAS went away; but the alt disagree EICAS remained. At FL310; we recorded Capt/FO/Standby altitude as 31000/31350/31900 and IAS as 280/285/295 knots. We completed the appropriate non normal checklists. After conferring with dispatch via SATCOM; we determined that the safest course of action was to divert to ZZZ1. We coordinated the diversion with ATC; and landed uneventfully at ZZZ1. We felt it was unnecessary to declare an emergency; as the IAS disagree EICAS had gone away. The flight attendants were briefed for a normal landing.
Captain reported receiving altimeter and airspeed malfunction messages during climb and elected to do a precautionary diversion.