Roll back

We had to roll back the changes to the database because of an unforeseen error.

NASA will roll back the shuttle launch due to bad weather.

In the previous tests, it was suspected that the volume of fuel contained in pipework had effects, both in the time taken for the restriction to affect engine performance and the nature of the fuel flow fluctuations after the engine had rolled back. Therefore, it was decided that the restriction would be simulated with the use of an orifice plate which could be introduced adjacent to the component being investigated.