Citation II S2/Bravo (C550)
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 80; Flight Crew Total 8100; Flight Crew Type 380
Time Pressure
Aircraft Equipment Problem Less Severe; Ground Excursion Runway; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Aircraft; Weather; Procedure; Airport
We landed on speed at the runway threshold. I applied brakes and actuated the speed brakes and thrust reversers as per the normal procedures.  There was an inordinate time delay for the thrust reversers to deploy.  I used maximum reverse thrust the aircraft failed to stop prior to the end of the runway.There were no fatalities or injuries as a result of this incident. There was no damage to the aircraft. There was no damage to the airport assets.
A CE-550 Captain reported after landing on a wet runway; he applied brakes; extended the speed brakes and selected reverse which activated slowly. The aircraft ran off the end of 4;100 ft runway without injury or damage.