Citation I (C500)
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 150; Flight Crew Total 5000; Flight Crew Type 1300
Aircraft Equipment Problem Less Severe
General None Reported / Taken
Aircraft
In the climb out the pilot side PFD went blank.  Autopilot was then engaged.  No signs were indicated in the cockpit of an impending failure prior.  The Pilot in Command (PIC) ran through the checklist for blank PFD failure in flight.  It was determined through checklist that circuit breakers were still in and avionics cooling fans were operational.  Flight was continued as checklist did not suggest diversion other than to continue.  At cruise flight the First Officer notified me PFD number 2 had flickered.  10 seconds later PFD number 2 tube went blank.  At this point PIC took controls while still under autopilot.  Once again checklist was read for PFD blank screen.  At this point in time to descent was 30 minutes away.  PIC determined that given the visual conditions and the fact that no navigational systems had failed and no flags were present the descent and landing could be completed safely and without incident to the destination.
In the climb out the pilot side PFD failed. Autopilot was then engaged. No signs were indicated in the cockpit of an impending failure prior. The Pilot in Command (PIC) ran through the checklist for PFD failure and measures were followed for a possible over-temp of the PFD. The brightness was turned down and circuit breakers were checked but were all in. Avionics cooling fans were checked to be operating and were. 25-30 minutes later I realized the screen flickering on my side and within seconds it went out. PFD2 failed. I transferred controls to PIC and ran same checklist. PIC engaged autopilot. Visual conditions were present; and flight continued without incident and landing at destination.
A C500 Flight Crew experiences a failure of the Captain's PFD during climb and elects to continue after complying with checklist procedures. Thirty minutes later the First Officer's PFD fails. The crew continues another thirty minutes to destination in VMC and lands safely.