Narrative:

[We were] on bullz five arrival given speed 300 KTS and 10;000 at krena. Prepped for runway 27R; thus had programmed the arrival from soolu to himgo. Just prior to soolu; ord approach control gave us a descent to 7;000 ft and expect [runway] 28R. I went heads down to reprogram [runway] 28R and the first officer started a descent to 7;000 ft in [lvl] chg; still at 300 KTS. When the [runway] 28R approach was selected; the arrival changed from the north to himgo to the south to tonie; very disorienting. Several seconds discussion was initiated between pilots as to where to go. As we referenced the chart and looked at the display; we noticed we were at 7;000 ft still at 300 KTS. Started slowing to 250 KTS and using heading select to get back towards jorjo; ord approach called and asked if we were on the approach. We stated we were heading to jorjo; and then they gave us direct to monkz. Rest of approach and landing was normal. Except: on landing roll; ord tower was giving us taxiing instructions: 'exit M1; M; cross runway 32L; and stay with me.' dangerous and dangerous as we are still at 80 KTS and slowing.changing runways is a fact of life; but to assign a runway close to the airport just prior to a significant change in the direction of the arrival is unsafe and unsound. They were telling us that they would give us a short approach; and in their haste to get the aircraft on the ground; they almost created an unsafe condition. Do not assign runways or change unless significant time is given to comply. Another way to help would be to assign the new runway and give a heading or direct to a point of the new part of the arrival. Keeping us at 300 KTS was inviting problems as they want you to slow and descend and turn early for an approach. Unsafe. Do not assign a high rate of speed and a lower altitude without calling: 'slow to 250 KTS; then descend to 7;000 ft.'

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Original NASA ASRS Text

Title: B737-800 flight crew reports a track deviation and an overspeed during the BULLZ 5 arrival to ORD Runway 27R when ATC switches to Runway 28R just as the flight is approaching SOOLU. SOOLU is the point at which the arrival diverges for Runway 28R and the crew is not prepared for the changes that occur when the FMC is reprogrammed.

Narrative: [We were] on BULLZ Five Arrival given speed 300 KTS and 10;000 at KRENA. Prepped for Runway 27R; thus had programmed the arrival from SOOLU to HIMGO. Just prior to SOOLU; ORD Approach Control gave us a descent to 7;000 FT and expect [Runway] 28R. I went heads down to reprogram [Runway] 28R and the First Officer started a descent to 7;000 FT in [LVL] CHG; still at 300 KTS. When the [Runway] 28R approach was selected; the arrival changed from the north to HIMGO to the south to TONIE; VERY disorienting. Several seconds discussion was initiated between pilots as to where to go. As we referenced the chart and looked at the display; we noticed we were at 7;000 FT still at 300 KTS. Started slowing to 250 KTS and using heading select to get back towards JORJO; ORD Approach called and asked if we were on the approach. We stated we were heading to JORJO; and then they gave us direct to MONKZ. Rest of approach and landing was normal. EXCEPT: on landing roll; ORD Tower was giving us taxiing instructions: 'exit M1; M; cross Runway 32L; and stay with me.' Dangerous and dangerous as we are still at 80 KTS and slowing.Changing runways is a fact of life; BUT to assign a runway close to the airport JUST prior to a significant change in the direction of the arrival is unsafe and unsound. They were telling us that they would give us a short approach; and in their haste to get the aircraft on the ground; they almost created an unsafe condition. DO NOT assign runways or change unless significant time is given to comply. Another way to help would be to assign the new runway and give a heading or direct to a point of the new part of the arrival. Keeping us at 300 KTS was inviting problems as they want you to slow and descend and turn early for an approach. UNSAFE. Do not assign a high rate of speed and a lower altitude without calling: 'Slow to 250 KTS; then descend to 7;000 FT.'

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.