The Navy is seeking a single source to repair three TCAS units for NAVSUP WSS Philadelphia, using authority FAR 6.302-1, as the government lacks necessary repair data. Interested contractors must have or obtain source approval; the government will not delay award to wait for new source approval. All responsible sources may submit capability statements and proposals, which will be considered if received within the specified response period. No budget amounts are provided. This notice is not a request for competitive proposals, but the government will review all timely responses.