left or right for azimuth or low for glidepath. THAT would definitely show that you were at, or no longer within, the three precision approach path obstacle clearances. According to ICAO 8168, what is regarded as the maximum safe deviation below the glide path during ILS approach 'Half scale deflection' Full deflection on a glide slope indicator indicates that the aircraft is: 2.5° above or below the correct glide path 0.7° above or below the correct glide path 0. As far as I know, the only time you would be " unsafe" would be when either of the indicators (azimuth or glidepath) was at their maximum deflection - as you wouldn't be able to tell whether or not you had exceeded that actual distance from the center or, if beyond, how far beyond. As markings on flight instruments vary, a ¾ scale deflection of either vertical or lateral guidance is deemed to occur when it is displaced three-fourths of the distance that it may be deflected from the indication representing that the aircraft is on the correct flight path. Full scale deflection is, well, deflection that goes all the way to the end of the scale, in other words, full scale. In the above meter, the amount that the needle moves away from 0 is called the deflection. However, that doesn't necessarily mean that during a precison approach getting to a 1/2 scale deflection plus an indicator width or two or three would put you in an area that was unsafe. Full scale deflection refers to the full range of motion of an analog ‘needle’ of an analog meter, or a galvanometer. In the approach mode, full-scale deflection of the CDI left or right represents just 0. The third level of sensitivity is the approach level. to VOR flying, a quarter-scale deflection seems like quite a bit. Well, congratulations on your success! But I think it may be important to recognize that for this particular discussion one would have to recognize whether the discussion was designed around the "maximum safe deviation" or the "maximum deviation acceptable for check ride purposes." Typically, the answer that dv8 provided, "All except precision approach ± 5°, and Precision approach half scale deflection azmuth and glidepath," is what most regulatory authorities accept as satisfactory for checking purposes. the full-scale deflection is plus or minus one nautical mile, thereby making each dot a fixed-distance deviation of a mere plus or minus 0.2 nautical miles. the localizer and glideslope are similar. Help understand localizer I’m so confused, if the localizer full scale deflection is 2.5 degrees, but then the course width is 3-6 degrees, but the signal is 35 degrees.
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