Claim C1.2.2.3.3.4.4.3.1.2 The (intelligent) control system has a tolerable failure rate

• Is a subclaim of Argument: A1.2.2.3.3.4.4.3.1 Collision Method 1 Using an Engineered SSC in the form of a guard. The guard has been designed, Hdbk, analysed, tested and shown to adequately mitigate Hazard 1 (Collision)

Child nodes:

• Has support Argument: A1.2.2.3.3.4.4.3.1.2.1 Analysis indicates that the control system's failure rate is acceptable

The only claim made on the (intelligent) control system is that it will not fail at a rate exceeding 1 pdfy. i.e. it will not challenge the safety guard more than 1 /y.

A single operation will last < 24hrs therefore this equates to 366 operations without failure.