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Old 14th Jul 2019, 18:53
  #8 (permalink)  
Herod

"Mildly" Eccentric Stardriver
 
Join Date: Jan 2000
Location: England
Age: 77
Posts: 4,142
Received 224 Likes on 66 Posts
It's because co-pilots can't count. "Shut down number three" would create confusion, whereas "shut down the left-hand green one" would be understood.
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