TY - JOUR
T1 - Search and recovery of aircraft parts in ice-sheet crevasse fields using airborne and in situ geophysical sensors
AU - Mankoff, Kenneth D.
AU - Van As, Dirk
AU - Lines, Austin
AU - Bording, Thue
AU - Elliott, Joshua
AU - Kraghede, Rune
AU - Cantalloube, Hubert
AU - Oriot, Hélène
AU - Dubois-Fernandez, Pascale
AU - Ruault Du Plessis, Olivier
AU - Christiansen, Anders Vest
AU - Auken, Esben
AU - Hansen, Karina
AU - Colgan, William
AU - Karlsson, Nanna B.
N1 - Publisher Copyright:
Copyright © The Author(s) 2020.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 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.
AB - 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.
KW - Applied glaciology
KW - crevasses
KW - glacier hazards
KW - glaciological instruments and methods
UR - http://www.scopus.com/inward/record.url?scp=85084309474&partnerID=8YFLogxK
U2 - 10.1017/jog.2020.26
DO - 10.1017/jog.2020.26
M3 - Article
AN - SCOPUS:85084309474
VL - 66
SP - 496
EP - 508
JO - Journal of Glaciology
JF - Journal of Glaciology
SN - 0022-1430
IS - 257
ER -