404 Titan is right. Quite apart from the legality side, an orbit on short-ish finals has got to be one of the stupidist maouevers you can perform, for a variety of reasons. In addition to the reasons that 404 Titan stated, it takes you outside the protected area for the approach, it makes it far harder for a following aircraft to spot you, and for that matter an aircraft on the ground about to line up, who will look in the usual spot for an approaching aircraft and not see you. It puts you in a virtually impossible position, at some airports, should you lose the engine, and it makes it very difficult to re-stabilise the approach once you have completed the orbit.
Stupid. Don't do it.
No doubt all the PNG bush-bashers will disagree...!
