Hi; Irrespective of whether it is 50' or not I find it hard to believe that the figure is given in a system which people under 40 have no heuristic knowledge of.
On Mon, 15 Oct 2012, Mark Newton wrote:
Hi folks. My google-fu is failing me, but at least one of you can probably help. I've long accepted that the rule for obstacle clearance is 50'. However, the GFA instructor handbook describes it as a wingspan, and the B certificate oral exam calls 50' a "recommended" minimum, so I'm trying to go back to sources to find the origin of the rule. And I can't seem to find it written down anywhere. I'm beginning to suspect that my long-term acceptance of the 50' rule is wrong, and that the real limit is, shall we say, more "operationally fluid" than that. Wondering if the strict mention of 50' that I've seen at clubs all over Australia is actually more of a tradition, perhaps derived from a misunderstanding of certified light aircraft performance charts which give minimum takeoff distances including clearance of a 50' obstacle. Does anyone have a cite to the regulations? (while you're at it, providing a cite to a current GFA or non-exempted CASA regulation which states what GFA annual check entails, whether it's required to be signed out in a logbook, or whether an instructor is even required to be present, would help to settle a long-standing argument :) - mark
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