King air flight crew reported a taxiway excursion after exiting the runway with excess speed.

Attributes
ACN	1624454
Time
Date	201903
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Super King Air 300
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 19 Flight Crew Total 13642 Flight Crew Type 5070
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 25 Flight Crew Total 2650 Flight Crew Type 200
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Speed All Types Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Taxiway Inflight Event / Encounter Weather / Turbulence

Narrative:

We were landing on a visual approach to runway xx at ZZZ. We were configured early and the approach was stable. The ATIS winds were reported 240/9 variable between 190/260. We observe the winds to be right to left; straight across the runway. We had planned to turn off on taxiway G; approximately halfway down the runway; as we had done numerous times before. We touchdown and the pilot flying entered full reverse. As we began to exit the runway and enter taxiway G; which is an approximate 45 degree turn to the left; the pilot flying brought the throttles to ground fine. However; the turn never stopped. The aircraft continued to turn to the left while the pilot flying applied maximum right rudder and braking. The aircraft did not respond. When it became apparent that we were going to leave the taxiway; the pilot flying shut down both engines and feathered the props. The left main and the nosewheel exited the taxiway as the left main sank into the mud.a contributing factor may have been the wind. As we turned onto golf the full force of the wind was on the back of the right prop disk while the left disk was shielded by the fuselage. This may have exacerbated the left turn.when we exited the aircraft; we noticed that there were no skid marks on the pavement and no flat spots on the right tires. With maximum braking; we expected to find some evidence of that. We will continue to work with our maintenance department to see if there was a contributing mechanical issue.because golf is a 45 degree turn from the runway; there is a tendency to take it in a slightly higher speed than a normal taxi speed. I would recommend in the future that you bring the airplane to a taxi speed prior to exiting the runway.

Original NASA ASRS Text

Title: King Air flight crew reported a taxiway excursion after exiting the runway with excess speed.

Narrative: We were landing on a visual approach to Runway XX at ZZZ. We were configured early and the approach was stable. The ATIS winds were reported 240/9 variable between 190/260. We observe the winds to be right to left; straight across the runway. We had planned to turn off on Taxiway G; approximately halfway down the runway; as we had done numerous times before. We touchdown and the Pilot Flying entered full reverse. As we began to exit the runway and enter Taxiway G; which is an approximate 45 degree turn to the left; the Pilot Flying brought the throttles to ground fine. However; the turn never stopped. The aircraft continued to turn to the left while the Pilot Flying applied maximum right rudder and braking. The aircraft did not respond. When it became apparent that we were going to leave the taxiway; the Pilot Flying shut down both engines and feathered the props. The left main and the nosewheel exited the taxiway as the left main sank into the mud.A contributing factor may have been the wind. As we turned onto golf the full force of the wind was on the back of the right prop disk while the left disk was shielded by the fuselage. This may have exacerbated the left turn.When we exited the aircraft; we noticed that there were no skid marks on the pavement and no flat spots on the right tires. With maximum braking; we expected to find some evidence of that. We will continue to work with our maintenance department to see if there was a contributing mechanical issue.Because golf is a 45 degree turn from the runway; there is a tendency to take it in a slightly higher speed than a normal taxi speed. I would recommend in the future that you bring the airplane to a taxi speed prior to exiting the runway.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.