After the passengers had disembarked, an engineer
boarded the aircraft and informed the flight crew that
the replacement left engine had not been subjected to
hgh-power ground runs because it had been suppled
“pre-tested”.
Not too sure I believe this. There would still be a requirement to check to at least part power in order to confirm the correct rigging.
However, there is still the possibility that the smoke wouldn't have been detected as quite often we check the engines with the bleeds off as per MM requirements.
My response to the posters question is that in civvy street we carry out ground runs only. Full power or part power according to the AMM regarding the circumstances of the change. This may include slam checks and, if adjustments are required a couple of shutdowns and re-lights. We do not however carry out an air test simply because of an engine change.