law: Custom Act, 1962 
  89.
  
  Stores to be Free of Export Duty. – 
  Goods
  
  produced or manufactured in India and required as stores on any foreign-going
  
  vessel or aircraft may be exported free of duty in such quantities as the
  
  proper officer may determine, having regard to the size of the vessel or
  
  aircraft, the number of passengers and crew and the length of the voyage or
  
  journey on which the vessel or aircraft is about to depart.