The Naval Air Systems Command intends to award a sole source delivery order to Sikorsky for design improvements on the CH-53K Aircraft, including prototyping an Avionics Cooling kit and supporting government flight testing. Sikorsky is the sole designer and producer of the aircraft, possessing the necessary technical data and expertise unavailable to the government for a competitive procurement. No specific budget amounts, performance location, or submission timelines are mentioned in the description. This notice is not a request for competitive proposals, but interested parties may respond to indicate capability. Responses must be submitted in writing to the specified contacts by the closing date of this synopsis.