BREAKING United #UA55 from Paris CDG to Newark is declaring an emergency. Live:

UPDATE #UA55 had mechanical issues related to autotrottles and navigation/sensor anomalies.

UPDATE 13:54 UTC United #UA55 to Newark landed safely at London Heathrow.

UPDATE 13:20 UTC United #UA55 from Paris CDG to Newark is diverting to London Heathrow (LHR).