B737-800
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Human-Machine Interface
Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification
Airspace Structure; Chart Or Publication; Procedure; Weather
On BANKR 2; in VNAV path; autopilot on; on path; on speed approaching DEBBT. The aircraft suddenly became high on the RNAV descent profile and entered a steep descent to try and catch the path. The aircraft accelerated from 270 kts to 300 kts. I exited VNAV and went to vertical speed mode to slow the rate of descent. We immediately advised approach that we were high and fast and unable to comply with the remainder of the profile. We were told to descend to 7;000 feet and given a phone number to call after landing. The remainder of the arrival; approach and landing was uneventful.Appears to have been a problem with either the VNAV system on the aircraft; the BANKR 2 profile; or both. Not sure how we could avoid this in the future. The aircraft was tracking the profile perfectly up until DEBBT intersection. We had entered tail winds in the box before the arrival since we anticipated a tail wind.
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B737-800 flight crew reported the aircraft was not able to meet the required restrictions on an BANKR2 RNAV Arrival.