When the airplane is at high angles of attack 
it becomes difficult to provide accurate indica- 
tion of airspeed because of the possibility of 
large position errors. In fact, for low aspect 
ratio airplane configurations at high angles of 
attack, it is possible to provide indications of 
angle of attack which are more accurate than 
indications of airspeed. As a result, an angle 
of attack indicator can be of greatest utility ar 
the high angles of attack. 
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