### Instruction:

Extract the cause and effect entities from the following sentence:
Upon determination of a conflict-free trajectory the controller sends the new trajectory to the flight crew via data communications

### Assistant:

KEYWORD: Upon
VARIABLE: the controller
CONDITION: sends the new trajectory to the flight crew via data communications
EFFECT_1: the controller sends the new trajectory to the flight crew via data communications
CAUSE_1: determination of a conflict-free trajectory

