Area Juliet. Running up both engines at the same time and/or running up the engines in order to test mags, feather etc while taxying.
Seems awfully complicated procedure on a dry taxiway let alone a wet one.
Once upon a time it was considered good airmanship to set the park brake first. Then run up each engine one at a time, not both at the same time. That way, the pilot could concentrate on the engine being tested.
Is it possible that if this procedure had been followed, a latent fault could have been picked up by an alert pilot during the run-up?
So what has caused these tried and tested run up procedures to change over the years?
And why the blinding rush to get the aircraft airborne when surely it would be more prudent to stop on the taxiway and execute a careful run-up before calling for take off clearance. Any cowboy can do a run-up on the run. In fact that is how you can spot a cowboy.