# What are these different kinds of acceleration?

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• What are these different kinds of acceleration? ToUsIf

Following acceleration paramters are transmitted from Inertial Reference System (IRS) to Flight Control System (FCS)

• Flight Path Acceleration
• Along Track Acceleration
• Cross Track Acceleration
• Vertical Acceleration
• Unbiased Normal Acceleration
• Along Heading Acceleration
• Cross Heading Acceleration

I only know acceleration based on the aircraft axis i.e lateral, longitudinal & Normal acceleration but what these acceleration paramters signifies?

• I can't be sure without seeing actual documentation of the thing, but I would expect:

• Flight path is direction of the total velocity vector, i.e. the direction the plane is flying, in Earth-relative frame of reference. This differs from direction of longitudinal axis by alpha (angle-of-attack), beta (side-slip) and wind.
• Track is projection of flight path to horizontal plane.
• Heading is projection of the longitudinal axis to horizontal plane.

Then:

• flight path acceleration would be simply acceleration along the flight path
• along track and across track are, well, along and across track as defined above.
• vertical is vertical; should not include gravity, so when maintaining vertical speed it should be 0.
• unbiased normal acceleration is most probably what is also called inertial normal acceleration, that is acceleration without gravity.
• along and across heading are, well, along and across heading as defined above.

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