The Naval Air Systems Command (NAVAIR) intends to issue a sole-source contract modification to Sikorsky Aircraft Corporation in Stratford, CT, for the development of a Fuel Shut Off Valve kit to support testing for the K16 aircraft. This kit will provide backup parts for a specific testing event. The work is considered sole-source because Sikorsky is the designer of the CH-53K helicopter and is deemed the only firm with the necessary knowledge, capability, and facilities to meet the requirements within the required timeframes.