Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 25; Flight Crew Total 6000; Flight Crew Type 1800
Confusion; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem
Aircraft; Equipment / Tooling; Human Factors
During a SID departure (BULRN1 RNAV) we lost FMS/GPS Navigation capability. We were unable to navigate VIA FMS/GPS immediately after departure. ATC was notified. Unable to find information in the QRH to resolve the issue. ATC issued radar vectors to the next intersection on the RNAV departure. ATC then issued radar vectors to a VOR along the course of flight. Due to the distance from SOT VOR we were unable to navigate to the VOR. ATC was advised and we continued to with radar vectors to the VOR. After about 30 minutes the non-pilot flying was able to reset the GPS and reinitialize our position. We had no further issues with GPS navigation for the duration of the flight.
HS125 Captain experiences loss of FMS/GPS navigation capability shortly after takeoff from IAD. Radar vectors are requested from PCT. Thirty minutes after takeoff full navigation capability is regained.