Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 485
Situational Awareness; Time Pressure
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Procedure; Human Factors
On arrival into MDW in a 250 knot Level Change descent to 6000 FT; expecting RNAV (RNP)-Y Runway 22L; we received a different approach to RNAV (RNP)-X Runway 22L; cleared direct to MIING to cross at 4000 FT cleared for the approach. After reprogramming the FMC; Pilot Flying put the next altitude on the approach 2900 FT into the MCP window but failed to select VNAV. The aircraft in Level Change descended 400 FT below the crossing altitude of 4000 FT approximately 5 NM west of the fix. Having to brief the new approach (task saturation) was put ahead of making sure the MCP was set up properly. Pilot Flying should have had the Pilot Monitoring do the programming to allow the Pilot Flying time to see the bigger picture and make sure the proper MCP mode was set prior to briefing the new approach. Knowing ATC's intentions further out would be helpful.
B737-800 Captain reported overshooting an altitude restriction on the RNAV RNP X Approach to 22L at MDW. Reporter cited a last minute clearance change as contributing.