Incident Overview
On April 20, 1998, an Airbus A300-600 operating between New York and London Heathrow experienced a malfunction of its navigational system. The incident occurred while the aircraft was in flight between its departure and destination points.
Crew Actions
The flight crew responded by activating the secondary flight plan. Following this action, the navigational system became operative and continued to function normally for the remainder of the flight.
Post-Landing Maintenance
After the aircraft landed at London Heathrow, maintenance personnel replaced the #2 Flight Management Computer (FMC). Subsequent checks confirmed that the navigational system was functional.
Conclusion
No further information about this incident has been made available. The investigation did not identify a probable cause for the initial malfunction.