Naval Air Systems Command, supporting the PMA-261 CH-53 Heavy Lift Helicopters Program Office, intends to negotiate a sole-source modification to an existing Basic Ordering Agreement delivery order with Sikorsky. The action will incorporate a tailored vibration requirement into the OBIGGS NRE delivery order, based on CH-53K flight-test data to better represent the aircraft vibration environment. The Government intends to negotiate only with Sikorsky under the “Only One Responsible Source” authority because Sikorsky is the CH-53K designer, developer, and sole producer and the only known contractor with the requisite knowledge, experience, and technical data; the Government lacks adequate license rights for a competitive procurement. This notice of intent is not a request for competitive proposals, but interested parties may identify their interest and capability so the Government can determine whether to conduct a competitive procurement. Companies interested in subcontracting opportunities should contact Sikorsky Subcontracting Manager Jason Lockwood at 203-225-3657 or Jason.t.lockwood@lmco.com.