Which instrument is most useful to maintain orientation during an instrument approach when outside visibility is poor?

• A. Altimeter
• B. Attitude indicator
• C. Airspeed indicator
• D. Turn coordinator

Answer: (B)

When you can’t rely on outside cues, you fly by instruments that show your actual orientation. The attitude indicator is the best for this because it presents a direct view of the aircraft’s pitch and bank relative to the horizon, functioning like an artificial horizon. On an instrument approach in poor visibility, you need to control both descent angle and bank to stay on the approach path and align with the runway. The attitude indicator gives you immediate feedback on whether you’re pitched too high or too steep, and whether you’re wings-level or banked, so you can make precise control adjustments.

The altimeter, while essential for maintaining the correct altitude, doesn’t tell you how the airplane is oriented. The airspeed indicator informs your speed, which affects energy management but not orientation. The turn coordinator provides information about rate of turn and coordination, but it doesn’t show the full attitude about pitch and bank, which is crucial for maintaining stable orientation during the approach.