On 9/19/2015 2:36 PM, gluejam via KRnet wrote: > In order for any other type to qualify, there must be no external power > needed to make it operational. Therefore, unless one of the > magnetometers you have researched will always operate reliably without > externally supplied power, then no, I can't agree.
There is no legal requirement for a non-powered compass. A powered compass meets the intent and letter of the requirement. AC 23.1311-1C section 8.8: http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC%2023.1311-1C.pdf 8.8.1 General. a. The operating rules, such as part 91 and part 135, specify the minimum required equipment that must be installed in part 23 airplanes based on the operation, such as VFR or IFR. Under VFR operation, part 91, ? 91.205, requires a magnetic direction indicator (that is normally intended to be a compass) for heading information. Under IFR operation, part 91, ? 91.205, requires a gyroscopically stabilized heading system. Section 23.1303(c), Amendment 23-62, amended the requirement from ?A direction indicator (non-stabilized magnetic compass)? to ?A magnetic direction indicator.? As new technology becomes more affordable for part 23 airplanes, many electronic flight instrument systems will use magnetically stabilized direction indicators (or electric compass systems) to measure and indicate the airplane heading to provide better performance. 8.8.2 Magnetic Non-Stabilized Direction Indicator. A magnetic non-stabilized direction indicator that is required by ? 23.1303 should have an accuracy of 10 degrees or have a correction card -Dj -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/
