A319
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Training / Qualification; Confusion; Distraction; Workload; Time Pressure
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew FLC Overrode Automation; Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem
Procedure; Human Factors; Company Policy; Environment - Non Weather Related
After a frustrating 2 1/2 hour delay for maintenance we received our clearance just before reaching the end of the runway. The new clearance was not quite as expected; as it bypassed the first fix to go to the second fix direct.  I tried to remove the first fix. Then I noticed it had dropped the takeoff airport and runway out of the flight plan. So I rebuilt the flight plan and we were subsequently cleared for takeoff. By this point we had finished the checklist so the captain and I reviewed the flight plan took the runway and we started our take off. The Captain set the thrust levers in the FLEX detent and I realized that no FLEX temperature was entered so I immediately called for TOGA.  The captain selected TOGA and we continued our take off. I called 80 knots and then realized we had no speeds. I remembered the speeds; so called them out and we continued the take off.Realize that on the Airbus; if the takeoff airport/runway drops out; you lose performance data as well.
If flight plan drops out of the MCDU; be sure to go back through EVERY page of the initial set up of the box to make sure that ALL data is in the box and correct. It is a great idea to COPY the fight plan into the secondary flight plan to use as a backup.
An A319 crew departed a foreign airport after a two hour delay and a flight plan change which resulted in the FMC dropping the departure airport and flight plan. Because the performance pages were not rebuilt the V-speed and flex power did not set with the TOGA selection; but the crew continued the takeoff.