### Instruction:

Extract the cause and effect entities from the following sentence:
The maximum period of repair once a failure of SKA1 has been established, shall be 1 (TBC) week

### Assistant:

CAUSE_1: a failure of SKA1 has been established
EFFECT_1: shall be 1 (TBC) week
KEYWORD: once
VARIABLE: a failure of SKA1
CONDITION: has been established

