Sunfish and others,
Tread wear and tread depth are not measured/evaluated in the same way as for a motor car tyre, visible tread or otherwise has little meaning.
How the serviceability of a aircraft tyre is determined re. wear remaining depends on the manufacturer, there are several different indicators used. even bare canvas being visible does not necessarily mean an aircraft tyre is worn beyond limits.
Sadly, many GA tyres are thrown away with life remaining, at great expense, at an annual/100h inspection, because of a stupidity in Schedule 5.
Serviceability of an aircraft tyre does not depend on the weather forecast for a flight.
Tootle pip!!
Last edited by LeadSled; 12th Jan 2013 at 23:05.