B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 70; Flight Crew Total 18600; Flight Crew Type 4000
Human-Machine Interface
Aircraft Equipment Problem Less Severe
Flight Crew FLC Overrode Automation
Procedure; Aircraft
ATC told us to descend via the KIPPR arrival. We attempted to do so using VNAV; but VNAV could not handle the altitudes and speeds. The winds were programmed; but were light and negligible. We had to revert to MCP [speed and path modes] to make the crossings and speeds.
When the VNAV PATH autoflight mode of a B757 was unable to comply with the speed and altitude constraints on the KIPPR RNAV STAR to DEN the flight crew intervened with alternate descent and airspeed autopilot modes.