Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to all aircraft (specifically balloons) that incorporate certain Cameron Balloons Ltd. (Sky Balloons) Mk1 (BR1) & Mk2 (Mistral) burners. This proposed AD would require you to replace the valve stems of the main blast, liquid fire, and pilot light valves. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this proposed AD are intended to correct the mechanical failure of the valve stem/seat pinned joint, which could result in a propane vapor leak. Such failure could lead to a propane explosion and fire.