 It was decided that ground testing of the onboard instruments would not be done on the Block II spacecraft because they had a functional midcourse correction engine and if a similar incident happened with them, the squibs and pyrotechnics used to deploy the solar panels could inadvertently ignite the propellants in the onboard engine, which could result in the explosion of the spacecraft on the pad and possibly take the entire launch vehicle with it.JPL officials announced that factory testing of the Ranger's systems was sufficient to root out any problems and any hardware which failed to pass the tests was not fit to fly.The experimental apparatus included