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Old 10th January 2009 | 12:57
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Shawn Coyle
 
Joined: Dec 2001
Posts: 1,835
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From: Philadelphia PA
Having tried both sky and ground pointer AI's in numerous aircraft and sims, my observation is that the sky pointer had more initial wrong moves to change bank angle than the ground pointer.
Other areas where controls / displays could be set up two different ways were in helicopter landing light switches and gimbal imaging system (FLIR, etc).
For the helicopter landing lights the options are moving the switch forward moves the light up or it moves it down. After lots of discussions, the test was to see which orientation led to the most initial incorrect movements - and the orientation with the 'move the switch up to move the light up' won hands down. Ditto for the FLIR- did lots of demos of FLIR to first time users, and engineers loved the move the switch up to move the line of sight up. Pilots hated it.
In both cases if the control had been a joystick type of control instead of a fore-aft switch, it might have been more obvious to the designers to make the control work more like an aircraft flight control.
Of course, in the US Army's OH-58D with it's mast mounted sight, the problem of which way should the sight be controlled was solved by putting in a switch to allow the operator to choose...
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