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SpaceX has identified the cause of the failure of last week’s Falcon 9R test flight failure as a single sensor.
On the Falcon 9R, there was no backup for this sensor, so the rocket was required to self-destruct when the sensor failed. On a Falcon 9, other sensors would have picked up the slack and the rocket would have continued in flight.
That the sensor is used by the Falcon 9, however, explains why they have delayed the next commercial flight. They probably want to make sure they understand why the sensor failed so they can reduce the chance of failure on the Falcon 9.