DFDR readout
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You can validate it by checking the other traces, ev aircraft heading and yaw rate. Heading is usually 0 to 180 with a bitwise operand to indicate 1-180 and 181-360.
Ideally, you need the LFL as indicated above
Ideally, you need the LFL as indicated above
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Hi guys,
thanks for your replies.
However, still struggling with the FDR readout.
I have a column on a FDR readout which puzzles me.
However, I am not allowed to poste a picture until after 10 posts.
Any suggestions.
Can I reach anyone outside PPRuNe?
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No matter ac variant. Clockwise is positive and counterclockwise is negative. Left rudder turns you counterclockwise.
From autopilot programming data return: Rudder Position Readout
On the DFDR data, you mention using SAGEM , can you provide the reference MFDAU program for the FDR information? I may be able to provide $$ an engine/transmission for that.
From autopilot programming data return: Rudder Position Readout
On the DFDR data, you mention using SAGEM , can you provide the reference MFDAU program for the FDR information? I may be able to provide $$ an engine/transmission for that.
Last edited by underfire; 19th Jan 2019 at 22:24.
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DFDR readout
As underfire says, clockwise is positive and counterclockwise negative, but you need to connect that with direction of view.
Normally this follows the right hand rule - hold out your right hand with thumb down, first finger forward, second finger out to your right.. These are the positive directions for forces and movements. Looking out along these axes positive rotations are clockwise.
So looking down your thumb, left rudder is positive but the consequent counterclockwise rotation is negative.
Looking out along your first finger right wing down bank is positive, RH aileron down is positive but gives a negative rolling moment
Looking out along your second finger nose up rotation (pitch) is positive, as is down elevator or THS movement.
Normally this follows the right hand rule - hold out your right hand with thumb down, first finger forward, second finger out to your right.. These are the positive directions for forces and movements. Looking out along these axes positive rotations are clockwise.
So looking down your thumb, left rudder is positive but the consequent counterclockwise rotation is negative.
Looking out along your first finger right wing down bank is positive, RH aileron down is positive but gives a negative rolling moment
Looking out along your second finger nose up rotation (pitch) is positive, as is down elevator or THS movement.
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DFDR readout
underfire - Then I am left wondering whether there is a difference between NTSB and BEA practice. In the AF447 final report it is specifically stated that positive pedal position is left and positive rudder surface is turn left. In the Concorde accident report it is stated that positive pedal is turn left.
