Related Clues:

• Proving ground
• Where one may be tried for lying?
• International base where engines are checked
• International base needs trial equipment
• Trial piece of equipment
• Trial equipment
• Practise sleeping - engineers are working on it
• Trials installation
• River bottom as place for experimental trials
• Area for trying out engines and machinery under working conditions
• River bottom as experimental area
• Arrears setback for aviation engineers
• It's hard to do without lying in framework of trial
• Experimental set-up to examine what sleeping conditions might be like?
• Hants runner's base in which working parts are put through their paces