On 30 September 2017, an Air France Airbus A380-800 suffered a failure of its fourth engine while over Greenland. This failure resulted in the loss of the engine fan hub, fan blades and surrounding structure. An initial search recovered 30 pieces of light debris, but the primary part of interest, a ~220 kg titanium fan hub, was not recovered because it had a different fall trajectory than the light debris, impacted into the ice-sheet's snow surface, and was quickly covered by drifting snow. Here we describe the methods used for the detection of the fan hub and details of the field campaigns. The search area included two crevasse fields of at least 50 snow-covered crevasses 1 to ~30 m wide with similar snow bridge thicknesses. After 21 months and six campaigns, using airborne synthetic aperture radar, ground-penetrating radar, transient electromagnetics and an autonomous vehicle to survey the crevasse fields, the fan hub was found within ~1 m of a crevasse at a depth of ~3.3 to 4 m and was excavated with shovels, chain saws, an electric winch, sleds and a gasoline heater, by workers using fall-arrest systems.

中文翻译：

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使用机载和原位地球物理传感器在冰盖裂缝领域搜索和回收飞机部件

2017 年 9 月 30 日，一架法航空客 A380-800 在格陵兰岛上空时第四台发动机发生故障。该故障导致发动机风扇轮毂、风扇叶片和周围结构丢失。最初的搜索发现了 30 块轻质碎片，但主要感兴趣的部分是一个约 220 公斤的钛风扇轮毂，因为它的下落轨迹与轻质碎片不同，撞击到冰盖的雪面，并且很快就被飘来的雪覆盖了。在这里，我们描述了用于检测粉丝中心的方法和现场活动的细节。搜索区域包括两个裂隙场，至少有 50 个被雪覆盖的裂隙，宽 1 到 ~ 30 m，雪桥厚度相似。经过 21 个月和 6 次战役，使用机载合成孔径雷达、探地雷达、