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Old 16th Nov 2012, 21:37
  #25 (permalink)  
Not Nightowl
 
Join Date: Dec 2001
Location: South of equator
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To grounded27.....never smoked mate but in a previous life as an A&P amongst other things used to see the brown crap 'round door seals and especially outflow valves in the days when smoking was allowed on pax 'planes, is tar or what ever from smoking
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