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印度班机(波音747)于1985年6月23日在北大西洋上空坠毁。使用美国Ferranti O.R.E有限公司的工作深度为2000米的侧扫声纳于搜寻调查工作。该公司的Keith Armstrong工程师于6月24日清晨使用的是100型侧扫声纳,它具有30KHz和100KHz两种工作频率。首先用30KHz频率作远距离搜寻,圈定了可能存在飞机残骸的海区,然后转换到100KHz作进一步定位搜寻。发现了一些碎片,航员们一致辨认就是波音747的残骸。经过继续反复搜寻,得到了一张飞机残骸碎片分布图,将其座标立即发送给印
The Indian flight (Boeing 747) crashed over the North Atlantic on June 23, 1985. Using the side scan sonar at Ferranti O.R.E Co., Ltd. with a depth of 2000 meters in the search and investigation work. Keith Armstrong, the company’s engineer, used the 100-type side-scan sonar in the early morning of June 24 with two operating frequencies of 30KHz and 100KHz. First, using 30KHz frequency for long-range search, delineated the possible existence of the wreckage of the sea area, and then converted to 100KHz for further positioning search. Found some debris, the unanimous identification of the 747 is the wreckage of the Boeing. After repeated search, get a plane debris debris distribution map, its coordinates immediately sent to India