Why not at a survivable level and a zero-thrust situation.
UP-IN-THE-AIR,
In short, because "CASA" does not "permit" it, because it "does not comply" with "their" "definition" of an "engine failure" ---- the engine must be failed ---- and running at a zero thrust setting is an engine running, not "failed", and therefor not "compliant" with having an "engine failure"., and it must be "on takeoff".
"Compliance" requires ignoring the CAAPs, CAAPs not being regulatory, the "Orders" (CAOs) trump the CAAPS.
All a matter of "black letter law", with criminal penalties for non-compliance ---- except for, apparently, the regulation requiring compliance with the aircraft AFM.
Sadly, this nonsense, with the inevitable result of a steadily rising toll of the dead goes further than CASA, the "industry" is not short of gunghoe idiots ( cf: the last fatal twin at Camden) who want to demonstrate their bigger balls ----- but CASA should be clamping down down ----- not "mandating" that such attempted suicide continue.
No doubt it was his quick thinking actions that saved both his own life and that of the student
In my opinion, this is about the only thing the PIC got right, the aircraft and the student should never have been put in this situation in the first place
---- why was he, the student??? This is core issue that ATSB declined to investigate.
Tootle pip!!
PS: And I do mean attempted suicide ---- every time you go outside the certified performance envelope of any aircraft ( and you are not a test pilot with a planned test objective) you are creating an unnecessary and avoidable hazard.
We have known for years that the hazard of shutting down an engine during asymmetric training, versus zero thrust, provides no training benefit worth the risk ----- but the practice persists in Australian, despite the steadily mounting and totally avoidable death toll.
PS2: Re. the last twin fatal at Camden, the two pilots did not die in the accident, they were both horribly burned, as well as other injuries, and as I recall the PIC died the following day, but the other poor bastard lingered for weeks before he finally died ---- and he only came to Australia with his family for a flying holiday, he was an airline captain --- he would never have expected that anybody would do what the PIC did --- and was well known, locally, for doing.