Can someone tell me what a "IMC aural null let down" actually is? Cheers FT
From "I Flew For MMA":
"In the unlikely event of a failure of the sensing unit in the Radio Compass which drove the pointer needle, we were required to practice the Aural Null method of finding the station, called "Resolving the Ambiguity". This meant, from an unknown position, flying the aeroplane in a series of turns, manually rotating the loop aerial and listening to the rise and fall of a tone (the null being the point of lowest volume) in the headphones. This would tell on which side of the Station you were and whether going towards or away from it. Having resolved the ambiguity, you flew towards the beacon, following the aural beam in - the volume slowly rising as you approached - listening for the sudden null which signified the "Cone of Silence" and announced passage of the Station, after which you could then make an instrument let down through cloud to the assigned Minimum, become visual and land, or if still in cloud, climb away and go somewhere else. Quite old fashioned even then - and long gone now - and done completely by earphone noise, it was a quite fascinating, last ditch way to get yourself out of trouble in bad weather or at night."
Also:
https://www.casa.gov.au/sites/defaul...on-finding.pdf
