Alternate static source or two static sources not subject to icing (front facing location) are required for IFR in Australia. Probably derived from FAA requirements. I remember my IFR C 182 RG had both: two static sources on the side of the fuselage and an alternate static knob at the bottom of the panel that connected the static system to cabin environment.
Fred
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I have no particular interest in arm-wreastling with the guy but can one of you, just one of you point to an FAA legal requirement that my little pip squeak of a 360 have an alternate static source to be legal for IFR?