2.  Heading indicator: Before takeoff, recheck the heading  indicator. If the magnetic compass and deviation card  are accurate, the heading indicator should show the  known taxiway or runway direction when the airplane  is aligned with them (within 5°). 3.  Attitude indicator: If the horizon bar fails to remain  in the horizontal position during straight taxiing, or  tips in excess of 5° during taxi turns, the instrument is  unreliable. Adjust the miniature aircraft with reference  to the horizon bar for the particular airplane while on  the ground. For some tricycle-gear airplanes, a slightly  nose-low attitude on the ground gives a level flight  attitude at normal cruising speed. Engine Shut Down When shutting down the engine, note any abnormal  instrument indications. 5-38