Q16 Single choice Mark for later Trim Systems A Indicates whether plane is climbing, descending or in levelflight Ex: rate of climb 500fpm B Relieve pilot of the need to maintain constant pressure on flight controls C Short: 10,000's feet Middle: 1,000's feet Long: 100's feet D One of most vital inst. in acft. Measures where acft is at in atmosphere presents as altitude. Correct answer