Date: 201710
Local time of day: 1201-1800
Location: ZID.ARTCC, IN
Flight conditions: IMC
Weather elements / visibility: Icing; Rain; Turbulence
Aircraft: Challenger 605
Operator: Corporate
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZID
ATC / advisory: Center ZID
Reporter organization: Corporate
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Human factors: Communication Breakdown; Human-Machine Interface
Anomaly: Conflict Airborne Conflict; Deviation - Altitude Overshoot; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence
Detector: Automation Aircraft TA; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: We were climbing on an assigned heading of 160 degrees in weather and turbulence. I asked the non-flying pilot to get me 10 degrees to the right to avoid what appeared to be heavier weather and turbulence. The non-flying pilot either didn't hear me or thought it would not be approved due to some traffic that he was monitoring but that I did not see. We were climbing rather rapidly so I switched to vertical speed mode to slow our climb rate. I probably did this too close to the level off altitude and the autopilot apparently could not keep up. The PFD showed 'Alts Cap' and I believed it was going to capture; but we coasted to FL270 to approximately FL272. At that time I clicked off the autopilot and leveled the aircraft. I was reluctant to push too hard on the yoke as to not upset the passengers or to put stress on the aircraft. I smoothly returned the aircraft to level flight but in the process of doing so we hear one 'traffic traffic' from the TCAS and the controller reminded us to 'maintain FL270.' The non-flying pilot informed me that he had been monitoring the traffic and that we had at least 500 feet between us. We did not seem to be that close laterally.I am fairly new in this aircraft and we fly it infrequently switching between types. I probably should have been climbing slower; I should not have switched from FLC to VS that close to a level off and I should have clicked the autopilot off sooner. I should also have been more aggressive about getting the 10 degrees right that I wanted to avoid some of the turbulence that may have contributed to the overshoot. The controller did a good job but the system sets us up for these type of situations because we are constantly leveling off during climbs and descents. There should be a better system that allows for aircraft to continue climbs without leveling off just to change frequencies and then climbing 1 or 2 thousand feet because we have entered someone else's airspace. We don't need to 'privatize' ATC but we do need to redesign and run the airspace like its one big country not individual little kingdoms that each sector is responsible for. Again; the controller did a great job in this situation.




Synopsis: CL605 First Officer reported due to weather and turbulence he was slow to level at their assigned altitude resulting in an altitude excursion.