I think the author implied but missed the opportunity of explaining the relevance of the airspeed indicator in explaining how to maintain straight and level flight in IMC with “needle/ball & airspeed” instruments. Please let me know whether you think I am correct in the following assertions:
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The airspeed indicator would tell you pitch, if power is a constant, by showing rate of change and direction of change, when flying straight and level: increasing airspeed = pitch attitude low (need to increase AOA) ; decreasing airspeed pitch = attitude high (need to decrease AOA).
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You need to know your straight and level target airspeed relevant to the current power setting.
One thing I don’t understand is how you would initiate and keep a constant rate turn with N/B&A, since, if you are lining the needle up with a turn marking (with ball centered of course), without a power change, airspeed have to decrease to maintain a constant altitude. How are level turns done with N/B&A?