Thanks for answering.
The rule makes sense, whether as a requirement or a suggestion.
After some googling, the rule is found almost verbatim copied from UK order in aviation regulations of: Ireland, Hong Kong, Uganda, Macao, Botswana, Rwanda, Kazakhstan. Couldn't confirm Czech Republic - cannot find their regulations.
I am almost positive US doesn't have this. Any other European countries?
Last edited by 502; 20th Sep 2009 at 12:19.
Reason: typos