Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 240; Flight Crew Total 30000; Flight Crew Type 11000
Situational Awareness; Human-Machine Interface
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance
General None Reported / Taken
Human Factors; Procedure
Descending into IAH on the MSCOT arrival we were given three runway assignments; the last being RWY 27. When we entered RWY 27 into the FMC; the altitude dropped out at BYSUN intersection. We caught the omission; but crossed the fix approx 400 FT high.
[Report narrative contained no additional information].
B757 flight crew reported crossing BYSUN high after runway assignment was changed three times on arrival to IAH.