Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 189; Flight Crew Type 5823
Communication Breakdown; Workload; Situational Awareness; Confusion; Distraction
Deviation - Altitude Overshoot; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Human Factors; Procedure
We arrived on MSCOT4 arrival. Got clearance from center to descend via. We started the descent via; and got a hand off to approach. Approach told us to descend via the 27 transition for a 26L landing. It took me a couple of calls to clarify what he was asking for; and he eventually just told us to fly a 085 degree heading after DOMNO. The descent went well and in the correct flight mode until after MSCOT. We ended up in open descent I did not catch the change as I was trying to configure the MCDU for the new arrival clearance. I saw as we were approaching DOMNO that we were descending through 8000ft; the bottom of the arrival window for that fix; and told the PF to level off and climb back to altitude. We got about 400 feet low and climbed quickly back to 8000ft. ATC never mentioned our deviation; and I am not positive that we weren't cleared to 6000ft.
[Report Narrative Contained No Additional Information.]
Confusion over the clearance and improper autopilot mode selection led to a possible altitude deviation at DOMNO on the IAH MSCOT4 Arrival. A late runway change from Runway 27 to Runway 26L contributed to the distraction.