Aviation Applied Technology Directorate, U.S. Army Aviation and Missile Command, Attn: AMSAM-RD-AA-C, Building 401, Lee Blvd, Room 117, Fort Eustis, VA 23604-5577

A -- RSEARCH AND DEVELOPMENT, BROAD AGENCY ANNOUNCEMENT SOL DAAH10-00-R-0005 DUE 080300 POC Ms. Beth Jackson, Contract Specialist, Phone Number (757) 878-0086 E-MAIL: Aviation Applied Technology Directorate, Ft. Eustis,, ejackson@aatd.eustis.army.mil. This is an Amendment to the Broad Agency Announcement DAAH10-00-R-0005 posted on the CBDnet June 13, 2000 and printed in the Commerce Business Daily issue dated June 16, 2000. The following are questions received on TOPIC 02-00 ROTATING/NONROTATING INTERFACE FOR DATA AND POWER, and the responses. QUESTION 1. Conventional sliprings are historically unreliable and would need short-term replacement. Technology solutions must address non-contacting mechanisms that provide bi-directional data and power transmission. Should this be interpreted to mean that all contacting mechanisms are viewed as "unreliable and in need of short-term replacement"? Are innovative contacting mechanisms of interest to the Army? RESPONSE: The statement that "conventional sliprings are historically unreliable and would need short-term replacement" is based on experience with conventional sliprings. The statement that "Technology solutions must address non-contacting mechanisms" is intended to show a preference to technology solutions to overcome the shortfalls of conventional sliprings, and is not to be interpreted that successful technology solutions must ONLY address non-contacting mechanisms. If an offeror has "innovative contacting mechanisms" to propose, the Army will consider them if they provide a technology solution that convincingly overcomes the reliability and maintainability limitations of conventional sliprings QUESTION 2. The solicitation states that " power across the fixed/rotating interface is also required (28v DC and 115v, 400hz AC) ." Some current fielded systems require 3-phase power. Is this anticipated for future Army requirements? RESPONSE: Since some current fielded systems require 3-phase power, it is anticipated that some future fielded systems will also require 3-phase power capabilities and that the desired fixed/rotating power interface must be accordingly designed. QUESTION 3. What is the Government's estimate of the level of power consumption to be addressed? RESPONSE: There is no set design specification for the power requirements of future active rotor systems, since there are a number of varied concepts. However, several current design activities estimate levels of power consumption may be up to 1000V, 1500W for active rotor actuation, assuming rotating system voltage amplification and high-efficiency drive system that can deliver AC commanded signals to the individual blades. QUESTION 4. The requirements for a 32 bit throughput for data is very high. What is driving this requirement? Is a throughput of 12-16 bit acceptable if it meets data requirements? RESPONSE: The requirement for a 32 bit throughput for data may be considered high; however, data with 32 bit resolution is not uncommon and has been a requirement in some cases (for example, ARINC 429 WORD and the 1553 Bus) since the 1970's. The driving factor for this requirement is the ability to sample data and encode the resulting information at a sufficient resolution to enable high performance in the design of future systems. Throughput of 12-16 bit is not acceptable as it does not meet the potential requirements of future systems. ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED. Posted 07/17/00 (W-SN475506). (0199)

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