Flight Crew Air Transport Pilot (ATP)
Time Pressure; Workload; Distraction; Confusion
ATC Issue All Types; Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Aircraft; Equipment / Tooling; Procedure
When established on the BONHAM 6 arrival and landing north; if given a runway change; the selected runway defaults to the entire arrival west of BYP. This creates a discontinuity on your route flown and will disengage LNAV. This anomaly creates a navigational interruption and is compounded when you receive frequent runway changes. While on the arrival; we were assigned Runway 35C then 35R then back to 35C all west of KARLA intersection. Fortunately; we stayed on the arrival using heading.I believe this discontinuity anomaly when you select a runway should be addressed and revised. But I also suggest in the reduction of runway changes while close to the Airport.
When established on the BONHAM 6 Arrival (BYP.BYP6) and landing North if you put in a runway change it will default to the arrival West of BYP regardless of your position on the arrival. This will create a discontinuity. We were originally assigned ILS 35C by ATC. Within a few minutes they assigned us ILS 35R. A few minutes later they again assigned us ILS 35C. The last two runway assignments were given West KARLA on the arrival. Each time we put the new runway assignment in the FMS it created a discontinuity west on BYP during a critical phase of flight.I would suggest that the arrivals be put in the FMS with the option of a North or South landing. This would allow the arrival to be clean with all points needed to fly the arrival. These points are not associated with any runway assignment. This would allow pilots to make the changes in the box in regard to ATC runway assignment without changing arrival routing.
ATC issued a B737-800 three BONHAM 6 North Arrival runway changes and with each runway change LNAV disengaged and the arrival defaulted to west of BYP which required a complete arrival rebuild for the new Runway 35.