Spence Construction Company built a hangar for an helicopter, which was kept on the owner's property. The owner did not pay for the hangar, so Spence filed a mechanic's lien on the helicopter. Was Spence Construction Company justified in doing this?

No, because a mechanic's lien can only be placed on the improvement.

Explanation:

Mechanic lien which is often termed as construction lien or artisan lien as the case may be, is a term that describes the security interest in the ownership of a property which can serves as a payment to individual or those that provide the work done, that improves the property.

In the case of Spence Construction Company and the owner of the Helicopter, it is believed that the hangar built by the Spence Construction Company does not in anyway, improves the Helicopter, therefore, Spence construction company was not justified in filing mechanic lien on the Helicopter.