B767-300 and 300 ER
Flight Crew Type 100
Confusion; Situational Awareness; Troubleshooting
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem
Aircraft
I was the pilot monitoring on a Pegasus 767-300 on departure; when five thousand feet from level off we lost VNAV. We detected the FMC had dropped the cruise altitude somehow; so we're entered cruise altitude of FL320. As we leveled off; we had been cleared to MEAGAN intersection on the departure; but the magenta line was gone from the PFD. Looking at the FMC; we saw that now the route was gone. I selected the departure again; but when I tried to execute it; it gave me a scratch pad message 'stand by one'. As I tried to execute the route the FMC locked up and failed to work. We notified ATC who gave us a heading as we worked on the problem. We ran the QRH procedure and slowly gained some use of the FMC in a limited state. We were finally able to load a route using LAT/LON and execute it. This was done using route two; route one was non-functional at this time. As we loaded more points; ATC gave us a heading for REMIS and we put it in the FMC and it allowed us to execute and NAV. As we continued; more of the functions began to return on both FMC's. We were finally able to load the entire route and successfully navigate to destination without further complications. Dispatch; the company and ATC were advised during the event. No deviations occurred that we are aware of.
B767 pilot describes a strange Pegasus FMC failure that the crew is eventually able to overcome; after much effort; and continue to destination.