According to standard instrument scanning, which trio should be continuously monitored to maintain proper attitude, altitude, and airspeed?

• A. Attitude Indicator, Altimeter, Airspeed Indicator
• B. Attitude Indicator, Altimeter, Magnetic Compass
• C. Attitude Indicator, VSI, Altimeter
• D. Altimeter, Airspeed Indicator, Heading Indicator

Answer: (A)

The main idea is that instrument flying relies on continuous feedback from the three primary flight indicators: the Attitude Indicator, the Altimeter, and the Airspeed Indicator. These three show you the core aspects you must constantly manage: how the aircraft is oriented (pitch and bank), how high you are (altitude), and how fast you’re going (airspeed). The Attitude Indicator is your window to the airplane’s orientation, so you can hold the desired attitude and coordinate with turns. The Altimeter tells you whether you’re climbing, descending, or holding altitude, which is essential for staying on a planned flight level. The Airspeed Indicator lets you maintain proper speed, crucial for performance, stall avoidance, and stable flight.

Together, they form the reliable trio you scan in a steady cycle to detect deviations quickly and apply the appropriate control inputs. The other instruments add useful information—direction from the heading indicator or compass, or rate of climb from the VSI—but they don’t directly tell you about attitude, altitude, and airspeed, which is why the three primary indicators are the ones you monitor continuously to maintain proper flight parameters.