Date: 201812
Local time of day: 1201-1800
Location: MDW.Airport, IL
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Small Transport; Low Wing; 2 Turboprop Eng
Operator: Personal
Operating under: Part 91
Flight plan: IFR
Mission: Personal
Flight phase: Descent
Airspace: Class B ORD
ATC / advisory: TRACON C90
Reporter organization: Personal
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor
Human factors: Workload; Time Pressure; Situational Awareness; Communication Breakdown
Anomaly: ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Detector: Person Flight Crew; Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Contributing factors: Human Factors; Procedure
Primary problem: Procedure

Narrative: While coming in to MDW they were using R22L. The ATIS said using RNAV Y Runway 22L. Runway 22L (Y) requires RNP; therefore; I was not able to load the approach into my FMS. I asked Approach about the issue and was told I would have to ask Chicago Approach when handed off. I then loaded the RNAV 22R. This caused the transition landing Runway 22L to disappear. I then needed to reload another approach. All while being given altitude changes and airspeed assignments. By the time I reloaded the approach of RNAV Z 22L I was passed HALIE. I realized I was off course to the left and started a turn to the right to rejoin the transition. I was then vectored off the STAR and then given direct to a fix on the STAR. The rest of the arrival and approach was uneventful. I was eventually cleared for the RNAV Z 22L. I was not notified by ATC that they had a problem with me. The jet in front of me was having the same issue and also the Controller and was told to ask Chicago Approach. I would say I was very busy at that moment and was having a time trying to keep up with the last minute programming and ATC instructions and lack of guidance. Things to do differently: I studied my approach plates the night before and knew I could not accept RNAV Y 22L. I should have loaded RNAV Z 22L instead of 22R. I figured I could ask for 22R; but eventually figured out RNAV Z worked for the arrival. ATC or ATIS needs to say RNAV Z 22L for us aircraft that cannot load RNAV Y 22L. The Approach Controller even cleared me for the Y Approach and I had to correct him and he re-cleared me for the Z approach. There was way too much last minute programming. I like to have my approaches loaded much earlier. Also; I do not go into very busy bravo airports very often. I fly lots of SIDS and STARS; but this was too chaotic rather than the STAR simplifying things like they typically do. Next time I go into MDW or any other airports with RNP required approaches I will load the alternate approach to the same runway.




Synopsis: Small Transport pilot reported high workload resulted in a track deviation on approach into MDW following multiple late changes to his clearance.