Contracts Competency Division, Attn. Chris Lyons, Bldg. 588 M/S 32, Naval Air Wareare Center Aircraft Division, Patuxent River, MD 20670-5304

52 -- MASS PROPERTIES INSTRUMENT AND SPARE PARTS KIT SOL N00421-95-R-5287 DUE 011796 POC Chris Lyons, Contract Specialist, (301) 342-1825 ext. 201 Linda Suggs, Contracting Officer, (301) 342-1825 ext. 108. This is a notice of intent to Request a Proposal and negotiate on an other than full and open competitive basis for the purchase of one Mass Properties Instrument and one spare parts kit for routine maintenance. This requirement will be negotiated on a sole source basis with Space Electronics, 81 Fuller Way, Berlin, CT 06037. In accordance with FAR 6.302-1, only one responsible source and no other supplies or services will satisfy agency requirements. This is primarily due to the requirement for compatibility with the existing array of test article interface hardware as well as concerns for the safety of operating personnel. The following is a summary of the elements or characteristics that the Mass Properties Instrument must possess. The Mass Properties Instrument shall measure the static balance, center of gravity, and moments of inertia of test objects. The cabinet of the instrument shall measure no greater than 48 in. by 48 in. by 48 inches. The Mass Properties Instrument shall be capable of supporting, measuring, and balancing payloads weighing between 200 and 6000 lbs. and the instrument shall be capable of being operated by remote-control to ensure the safety of operating personnel. The center of gravity performance limits shall consist of the following: (a) the full scale moment due to offset center of gravity of part shall be 5,000 lb-inch, (b) the moment sensitivity (smallest detectable change) shall be 0.3 lb-inch, (c) the moment resolution (smallest moment display increment) shall be 0.05 lb-inch, and (d) the maximum center of gravity displacement (if not limited by moment) shall have no limit. The moment of inertia performance limits shall consist of the following: (a) the specifications for accuracy shall be (+/-) 0.25% of value, (b) the maximum moment of inertia that can be measured shall be 5,000 slug-ft2, (c) the temperature error due to tare moment of inertia (per degree Fahrenheit short term change in ambient temperature) shall be 0.00002 slug-ft2, and (d) the timing error shall be 0.00004 slug-ft2. Addtionally, the following patterns and counterbore shall be provided on the mounting plate: (a) eight holes on a 10 in. diameter bolt circle tapped for 1/2-20 UNF-3B threads, (b) eight holes on a 15 in. diameter bolt circle tapped for 1/2-20 UNF-3B threads, and (c) eight holes on a 20 in. diameter bolt circle tapped for 1/2-20 UNF-3B threads. NOTE: Bolt circles to be concentric with axis of rotation within 0.01 inch tolerance in radius and thread depth to be a minimum of 1.5 diameters of the thread size. A tolerance of 0.01 in. will be allowed on the chord between consecutive holes in any one bolt circle. A pilot bore of 0.7500 +0.0003/-0.0000 diameter by minimum 0.5 in. deep and concentric with the spindle axis within 0.0001 tolerance in radius shall be provided in the rotating mounting plate. Additionally, the outside diameter of the mounting plate shall be 23 inches. The function of the spare parts kit is routine maitenance of the Mass Properties Instrument. A firm-fixed price contract is anticipated. All resposible sources may submit a proposal which shall be considered by the agency. See Numbered Note 22. (0332)

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