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Thread: How old is too old?
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Old 8th May 2011 | 20:24
  #9 (permalink)  
Jan Olieslagers
 
Joined: Jul 2010
Posts: 2,807
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From: Ansião (PT)
Meseemeth it stands for "Airworthiness Directive" - a mandatory modification, correction, or inspection.

But the unsanctioned use of codes and abbreviations is indeed confusing, to say the least.
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