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# Acceleration and Turning errors

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# Acceleration and Turning errors

1st Feb 2005, 15:00

Join Date: Apr 2000
Location: West Midlands, UK.
Age: 70
Posts: 294
Acceleration and Turning errors

Can anyone supply/suggest one or more handy mnemonics which aid the recall of the facts associated with A and T errors in both hemispheres? Thanks in advance for any suggestions.

1st Feb 2005, 15:13

Join Date: Feb 2002
Location: oxford
Posts: 247
Not mnenomics, exactly, but simple statements of the rules, which are not complicated. People just make them complicated. Perhaps if you see them simply stated, you can make up your own mnenomics.

Acceleration Errors:

Acceleration on E or W in either hemisphere always gives an APPARENT turn towards the nearer pole.

Turning Errors:

When turning through the nearer pole (ie, turning through North in the northern hemisphere or through South in the Southern Hemisphere):

The compass is SLUGGISH.
The magnetic assembly and the aircraft are turning in the same direction
The compass will under-indicate the amount of turn.
The pilot should undershoot the turn/roll out early.
Liquid swirl will increase the turning error.

When turning through the further pole (ie, turning through South in the northern hemisphere or through North in the Southern Hemisphere):

The compass is LIVELY.
The magnetic assembly and the aircraft are turning in the opposite direction
The compass will over-indicate the amount of turn.
The pilot should overshoot the turn/roll out late.
Liquid swirl will decrease the turning error.

1st Feb 2005, 17:38

Join Date: Apr 2000
Location: West Midlands, UK.
Age: 70
Posts: 294
Thanks OB - this is much clearer ..

20th Feb 2005, 09:32

Join Date: May 2003
Location: france
Posts: 194
hello every one,

acceleration error (north hemisphere, E-W heading)): think"ANDS":"Acceleration North Deceleration South".

turning error (north hemisphere), think:"never see north, always see south".

in south hemisphere reverse apply:"ASDN"
"never see south, always see north"

on equator there are no errors.

20th Feb 2005, 10:42

Join Date: Jun 2001
Location: England
Posts: 1,003
Hi,

Oxford Blue, that is the clearest explanation of the effect and the reason for it.

I wish the ATPL sylabus could have explaned it so well.

18

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