B737 MAX 8
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure
I was PF from ZZZ-ZZZ1; during the climbout at 17;000 feet with the autopilot engaged we had just started to get some trace ice on the windshield wipers (probe heat and engine anti-ice on) when we got 'IAS DISAGREE' caution lights on both CA (Captain) and FO (First Officer) PFDs. No other alerts. We requested priority handling with ATC. We looked at the IAS disagree checklist in the Quick Reference Handbook which then told us to go to the 'AIRSPEED UNRELIABLE' checklist. I performed the initial Quick Reference Checklist procedures and then the CA read through the rest of the Quick Reference Handbook as I followed procedures and continued hand flying up to cruise altitude of 34;000 feet. We determined that the problem was on the FO side so once the checklists were complete and we were leveled off at cruise altitude; we swapped controls and the CA became PF since he had the accurate airspeed indication. 'IAS DISAGREE' flashed on and off frequently as the spread between CA and FO IAS +/- 10-15 kts and then it stayed on consistently for ~30 minutes during climb. Once we were at cruise and clear of icing and clouds then the 'IAS DISAGREE' indication went away and the FO IAS indicator appeared to work normally. We discussed with dispatch our possible diversion choices but all of them either involved going through a line of weather or re-encountering icing; we decided that the safest course of action was to continue on to ZZZ1 where the weather was VFR. Then as we started our VFR descent into ZZZ1; we got the 'IAS DISAGREE' indication flashing on and off again sporadically several times with no further issues associated and landed uneventfully.The logbook had showed that an inspection had been performed on pitot static system overnight in ZZZ. Icing conditions present during taxi and climb. ATC gave us everything we asked for. Captain said that crew phone to contact Dispatch was valuable. Recent MAX training definitely made our response simple and effective. We found out from the mechanics that met us at our gate that this aircraft had had multiple pitot/airspeed problems in the past. Aircraft was a MAX.I've heard now that we are the 2nd 737 (ours being a MAX; other being an NG) that has had 'Unreliable Airspeed' in the last week! Need to ground these aircraft until the source(s) of the problems are resolved.
Reporter stated the flight crew initially suspected moisture in the pitot/static system was freezing; causing the IAS disagree; but the anomaly remained even in descent into warmer air.   Reporter acknowledges that even unfrozen moisture can cause pitot/static anomalies.   Reporter is unaware of when this aircraft was returned to service.
B737 MAX 8 First Officer reported unreliable airspeed indications and elected to continue the flight to destination to avoid any additional icing conditions and relied on the Captain's instruments.