Dirty 747-400's

From:         Andrew Hutchings <andy@airnorth.demon.co.uk>
Date:         11 Aug 96 00:03:56 
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Of all the 'new-generation' airliners I see around, there seems to be
one (at least to me) that always looks dirty and 'well-used'. This
is the 747-400.
Can anybody tell me why this is ?. The areas that are 'always' dirty
are predominately down the back of the aeroplane, the lower part of
the rudder, the tail-cone, and the area of the fuselage just above
the horizontal tail surfaces. This 'dirty-ness' is sometimes also
seen around front cargo holds, and passenger doors .... is it
something to do with pressure leaks ??.

Andy

ANDREW HUTCHINGS, NEW CASTLE, UK
e-mail: andy@airnorth.demon.co.uk
WWW:    http://www.airnorth.demon.co.uk/