Jan 5 1977
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(New page: The U.S. Air Force Systems Command reported it had worked out a way to suppress noise of jet-aircraft engines during maintenance operations on the ground, as a means of reducing hearing lo...)
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The U.S. Air Force Systems Command reported it had worked out a way to suppress noise of jet-aircraft engines during maintenance operations on the ground, as a means of reducing hearing loss in maintenance personnel and noise impact on the community. Fifty-eight Air Force bases worldwide had received the suppressor units, consisting of primary and secondary air intakes and enclosures, augmenter tube, exhaust muffler, and support structure to house controls and water pumps. After backing an aircraft into the secondary enclosure, workers would enclose the air intakes at the front in the primary-intake mufflers; the secondary enclosure, covering the aft fuselage and engine exhaust, would include openings to be sealed against the fuselage and stabilizers to keep noise inside. Inside the augmenter tube, secondary cooling air would mix with the exhaust, and spray bars in the tube would spray water at 800gal per min during afterburner operation. (OIP Release 284.76)
The International Telecommunications Satellite Organization (INTELSAT) announced it would award to a British company, HERE Hartwell, a 15mo $71 540 fixed-price contract to develop low-pressure, nickel-hydrogen power cells that would use a lanthanum-alloy member both as hydrogen reservoir' and as negative electrode. Use of lanthanum would lower pressure in the cells, reduce the heat dissipated during discharge, and reduce the volume of cell density. If successfully developed, the cells would operate at a maximum pressure of about 6 atmospheres and would have a minimum life of 500 charge-discharge cycles when used in synchronous-satellite applications. (INTELSAT Release 77-1-M INTELSAT announced award of a 15mo $72 536 fixed-price contract to EIC Corp. of Newton, Mass., for development of an improved highpressure nickel-hydrogen power cell that would increase reliability and attain a minimum 10yr cyclical life in synchronous-satellite applications.
Such an advance would permit about 4000 daily charge-discharge cycles, or about 10yr of maintenance-free operations. (INTELSAT Release 77-2-M)
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