HSC/YAK, 8107 13th Street, Brooks AFB TX 78235-5218

A -- ACTIVE NOISE REDUCTION (ANR) SYSTEM - PART 1 OF 2 SOL F41624-96-R-1013 POC MS. Susan M. Madrid, Contract Specialist, (210) 536-6337; MS. Crystal Ebert, Contracting Officer, (210) 536-6686. This is a combined synopsis/solicitation for commercial items prepared in accordance with the format in the Federal Acquisition Regulation (FAR), subpart 12.6, as supplemented with additional information included. This announcement constitutes the only solicitation. Proposals are being requested. A written solicitation will not be issued. NOTE: At the end will read END, if the offeror's copy stops before this point contact the POC. The incorporated document, provisions and clauses are those in effect through Federal Acquisition Circular 90-37 and Defense Acquisition Circular 91-10. This acquisition is unrestricted and is not a Set Aside for Small Business. SIC code #3669. Contract Line Item Numbers (CLINs) are a follows: CLIN 0001 - 318 ea. SPH-4AF ANRS, CLIN 0002 - 318 ea. Battery Pack, CLIN 0003 - Spare Parts. The Minumum Essential Salient Characteristics are: 1)The ANRS major assemblies shall consist of the system cables, helmet mounting harware, and ANR component (earcup or module) 2)ANRS shall mount in the SPH-4AF helmet as a direct replacement or reconfiguration thereof 3)Required accessories shall include manuals for installation, operation, maintenance, and a 28 VDC battery pack. The battery pack shall not exceed 6''x5''x2'', 1.3 lbs, and provide 3 Watts for 6 hrs operation. Battery pack shall include a positive-locking On/Off switch. The power plug shall be enclosed within a plastic housing to prevent exposure of metal contacts when mated to the TP-108 4)Shall have a communication input impedance of 10 to 20 Ohms, operate with 0 to 3.16 VRMS audio inputs, and be compatible with the AN/AIC-33 low impedance intercommunication system (ICS) 5)Shall operate with an unfiltered 28 Volt DC MH-53J aircraft power source and not consume more than 3 Watts when operated in a 115 dB OASPL noise enviroment 6)Shall have a Nexus TP-108 connentor with pin assignments: P1:Microphone low, P2:Communication High, P3:Microphone High, P4:Communication low, J1:+28VDC, J2:NC, J3:Ground, and J4:Shield 7)Shall not produce spurious sounds when operated in 130 dB OASPL noise enviroments 8)Shall not be damaged due to short circuit of the boom microphone, audio input or application of reversed 28 VDC power 9) ANRS installed in the SPH-4AF shall meet or exceed the 1/3 octave attenuation (dB) values of 3, 5, 7, 9, 11, 15, 18, 20, 22, 24, 26, 26, 25, 22, 20, 25, 28, 30, 30, 30, 35, 35, 35, 35, 35 and 35 at 1/3 octave band frequencies (Hz) of 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10,000 respectively when tested IAW ANSI Microphone-in-Real-Ear,s12.42 10)ANRS shall improve intelligibility of communications beyond the standard SPH-4AF. Intelligibility of warnings/cues from the aircraft ICS to the ANRS shall be maintained with ANR on/off 11)Noise floor shall be minimized and not interfere with comunications 12)When mounted on human heads, ANRS shall produce an acoustic frequency response of +/- 8dB between 300-4500 Hz. The response shall roll-off outside the specified pass band and be met with ANR on/off. On human head ANR sensitivity (dB SPL/V) non-operational shall be 100(+/-3) and 97(+/-3) at 400 and 1000 Hz, respectively. Operational ANR sensitivity shall be 100(+/-3), 101(+/-3) and 115(+/-5) at 400, 1000 and 3000 Hz, respectively. (Fixture and maniquin correlation figures shall be provided and used to translate frequency response and sensitivity measures to the human head) 13)Difference between the average 630 hz, 800 Hz, 1 kHz and 1.25 kHz 1/3 octave band SPLs for the left and right earcups shall not exceed 3 dB 14)The SPL output per Volt of audio signal input of ANRS shall be linear with +/- 1.5 dB at 1 kHz from 65 dB to 115 dB output SPL 15)Connentors and cable termination points of the cable assemblies shall resist twisting and slippage of the cable from the connector or termination point due to twist and pull. The strain relief at each leg of the cable assembly shall withstand an axial load of 8 lbs for 30 min, for legs containing 3 or fewer conductors and 25 lb for 2 min, for legs containing more than 3 conductors 16)External color of all cable assemblies shall be black with a dull finish 17)All 2 conductor cables shall have a mean flexing life of 25000 flexes. Cable assemblies with more than 2 conductors shall have a mean flexing life of 50000 flexes 18)Cable shall meet or exceed the flame retardancy requirements of UL-94V-0 19)Cable assemblies shall withstand 500VDC for 1 min between any conductor and the outer shield with a leakage current no greater than 1 milliampere 20)Insulation resistance between any one conductor and the remaining conductors shall be no less than 100 Mohms at 100VDC 21)Electromagnetic isolation of the cable assembly with connectors measured at 5, 10 and 20 kHz shall be 60 dB or greater between conductor pairs 22)ANRS shall integrate with the SPH-4AF, LPU-10/P, LPU-21/P life preservers, M-87A/AIC microphone, SRU-21/P Survival vest, HGU-4/P Aircrew spectacles, and Aircrew Eye Respiratory Protection (AERP). Cables shall allow MH-53J crewmembers sufficient freedom of movement to perform their operations unimpeded. Mating connectors shall not disengage during the performance of normal crewmember duties and be configured to prevent misalignment and incorrect mating. The crewmember shall be capable to donning/doffing an ANRS configured SPH-4AF with no interference from electrical cables 23)For each SPH-4AF helmet size, ANRS when installed shall fit the same population as the same size stock SPH-4AF. ANRS shall not impose discomfort, excessive pressure points on the external ear, or require ear inserts that block the ear canal 24)Total weight, including earcups, cabling, helmet mounting hardware and any other items required for the SPH-4AF, shall not exceed 1.5 lbs 25)Reliability shall be determined according to best commercial practices, using MIL-HDBK-217 as a guide. Mean Time Between Failure (MTBF) for any failure shall not be less than 22,000 hrs. ANRS service life shall not be less than 3 years to include 2 years storage and a 1200 hour operational life 26)ANRS shall consist of major assemblies which are throw-aways. (0194)

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