Canada? Not sure myself but I had heard the same about Alaska. An issue (perhaps still, not sure) for the FAA was that other govt departments operated airplanes and claimed that the regs did not apply to them.
You need an engineering order?!?!?
An issue with the way that minor and major changes are dealt with by CASA. If it is minor then an EO is required. Incidentally, any, repeat any change is either major or minor so what I might describe as a trivial change has to be dealt with as a minor change therefore needs an EO. In the USA minor changes are dealt with much easier.
Worth reading the relevant bit of that new CAAP on EFBs:
7.9
All EFB mounts attached to the aircraft structure will require airworthiness approval (Subpart 21.M of the Civil Aviation Safety Regulations 1998). An unsafe condition must not be created when attaching any EFB control yoke attachment/mechanism or mounting device. For example, the weight of the EFB and mounting bracket combination may affect flight control system
dynamics, even though the mount alone may be considered light.
"All" means all" - temporary or permanent.
Some more relevant reading is the new AWB 25-023 on the use of Velcro to mount ELTs.