Death Cruiser Flight Crew
Join Date: Jun 2001
Location: Vaucluse, France.
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If it's an aircraft with a bogie maingear e.g. 757/767/747, the truck levelling system forces the bogie into the correct position for retraction. The 767, for example, has the bogie pointing slightly down. The thump can be felt in the flightdeck. The landing gear will not retract unless the truck leveller microswitches confirm that the bogie is correctly positioned, amongst other things.