Learn how to use instrument scanning techniques to monitor your flight instruments and maintain control of the airplane when flying by reference to instruments.
You will learn how to perform an effective instrument cross-check, understand different scan patterns, and select the right instruments to monitor during common flight maneuvers.
Understand how flight instruments provide information about pitch, bank, heading, altitude, and airspeed.
Discover radial scanning, T-scan, and other instrument scanning patterns used to monitor flight performance.
Learn how to check the most useful instruments during straight-and-level flight, climbs, descents, and turns.
When flying by reference to instruments, pilots must use several flight instruments to understand what the airplane is doing. Looking at only one instrument can cause you to miss important changes in altitude, airspeed, heading, or attitude.
An effective instrument scan helps you notice small changes early and make smooth corrections. It also helps you avoid focusing on one instrument for too long.
Good scanning is not about moving your eyes as fast as possible. It is about checking the right instruments at the right time. This lesson uses clear diagrams and practical flight examples to help you develop an effective instrument cross-check.
What Is Instrument Scanning in Aviation?
Instrument scanning, also called an instrument cross-check, means looking at your flight instruments regularly to understand what the airplane is doing.
Instead of watching only one instrument, you take quick looks at different indications and compare the information. This helps you detect changes in the airplane's attitude and performance.
Why Is One Instrument Not Enough?
Each flight instrument gives different information. For example, the attitude indicator shows the airplane's pitch and bank attitude, while the altimeter shows its altitude.
An airplane may appear level on the attitude indicator but still be slowly climbing or descending. You need information from other instruments to recognize this.
In a traditional six-pack cockpit, the main flight instruments are arranged as shown below.
A Simple Instrument Cross-Check Example
Imagine you are flying straight and level, trying to maintain an altitude of 5,000 feet and a heading of 090°.
Continue checking these indications and the other relevant flight instruments. If one indication starts moving away from the desired value, interpret the change and make a small correction when needed.
No. There is no single scan pattern that works best for every situation.
The instruments you check most often depend on the maneuver you are flying and the information you need. A good scan is continuous, but it is also flexible.
Instrument scanning means checking and comparing flight instrument indications to monitor the airplane's attitude and performance.
Do not focus on a single instrument. Check the information you need, recognize changes, and make smooth corrections when necessary.
Understanding Flight Instruments: Pitch, Bank and Power
When flying by reference to instruments, you need to control three important things: pitch, bank, and power.
Different flight instruments help you monitor each one. Some show the airplane's attitude directly. Others show the results of changes in attitude or power.
The Three Main Instrument Groups
Pitch is the position of the airplane's nose relative to the horizon.
- Attitude indicator: shows pitch attitude directly.
- Altimeter: shows changes in altitude.
- Vertical speed indicator: shows the rate of climb or descent.
- Airspeed indicator: helps show the effect of pitch changes on airspeed.
Bank is the angle of the airplane's wings relative to the horizon.
- Attitude indicator: shows bank attitude directly.
- Heading indicator: shows changes in heading.
- Turn coordinator: provides information about turning and coordination.
- Magnetic compass: provides a heading reference when its indication is steady.
Power is the output produced by the engine. Pilots adjust power to help achieve the desired performance.
- Tachometer (RPM): shows engine speed.
- Manifold pressure gauge: helps monitor engine power when installed.
- Airspeed indicator: shows the effect of power and attitude on airspeed.
Power + Attitude = Performance
A simple rule in instrument flying is Power + Attitude = Performance.
This means that the airplane's attitude and engine power work together to produce the desired flight performance.
Set the appropriate engine power and airplane attitude, then check the instruments to see whether you are getting the desired result.
How Does This Work in Flight?
Imagine you want to maintain straight-and-level flight at a constant airspeed.
Use the attitude indicator to establish the desired pitch and bank. Set the appropriate engine power using the aircraft's power instruments.
Check the altimeter, airspeed indicator, vertical speed indicator, and heading indicator to confirm that the airplane is doing what you want.
If the result is not correct, make a small adjustment to attitude or power as appropriate, then check the instruments again.
An instrument may be especially important during one maneuver and less important during another.
For example, the altimeter is important when maintaining a fixed altitude, while the vertical speed indicator becomes more useful when maintaining a steady climb or descent.
This is why an effective instrument scan changes with the flight situation.
Pitch, bank, and power are the foundations of attitude instrument flying. Use the appropriate instruments to control the airplane and check its performance.
Remember: Power + Attitude = Performance. Set the desired attitude and power, check the result, and make smooth corrections when necessary.
Instrument Scanning Techniques: Radial Scan, T-Scan and Other Patterns
There are different instrument scanning techniques that help pilots check flight instruments in an organized way.
The main goal is always the same: check the instruments you need, understand their indications, and avoid looking at one instrument for too long.
Types of Instrument Scans
The following patterns are commonly used to explain instrument scanning in a traditional six-pack cockpit. The attitude indicator (AI) is the primary reference for pitch and bank because it shows the airplane's attitude directly.
The radial scan, also called the hub-and-spoke scan, uses the attitude indicator as the center of the scan.
Look from the attitude indicator to another instrument, then return to the attitude indicator before checking the next one.
Select the instruments that matter most for your maneuver. For example: AI → ALT → AI → HI → AI.
You do not have to check every instrument in the same order on every scan.
The basic T-scan focuses on four instruments arranged in the shape of a T: airspeed, attitude, altitude, and heading.
This is a useful way to focus on the main information needed during straight-and-level flight.
Check attitude frequently, then confirm airspeed, altitude, and heading as needed.
The basic T is a useful training pattern, not a reason to ignore the other flight instruments.
This technique follows a simple V-shaped path from the attitude indicator to two instruments on the lower row.
Look at the attitude indicator, check the turn coordinator, return to the attitude indicator, then check the vertical speed indicator.
This pattern helps you compare pitch and bank attitude with indications of turning and vertical speed.
It is a training pattern, not a complete scan for every flight situation.
The rectangular scan follows a path across the top three instruments and then along the bottom three instruments.
It helps the pilot look at all six instruments, but it does not give more attention to the instruments that may be most important for the maneuver.
Follow the instruments in a rectangular order. The pattern can move clockwise or counterclockwise.
Be careful: this method may delay your return to an instrument that needs immediate attention.
Which Instrument Scan Should You Use?
No single scan pattern is best for every pilot or every maneuver. The important skill is knowing what information you need and checking the appropriate instruments often enough.
You want to maintain your altitude and heading. One possible selected radial scan is:
Check the attitude indicator to confirm pitch and bank. Look at the altimeter to check altitude, return to the attitude indicator, then check the heading indicator.
You must also check airspeed and the other relevant instruments regularly. This is an example, not a fixed sequence that you must repeat without change.
An effective instrument scan is organized but flexible. Select the instruments that provide the most useful information for your maneuver.
The radial scan is one way to build a strong cross-check: return frequently to the attitude indicator, take short looks at other instruments, and adjust your scan as needed.
How to Perform an Effective Instrument Cross-Check
A good instrument cross-check is more than looking at different instruments. You must understand what their indications mean and use that information to control the airplane.
The FAA emphasizes two fundamental instrument-flying skills: cross-check and interpretation. Together, they lead to positive aircraft control.
Four Steps to an Effective Cross-Check
Know the altitude, heading, airspeed, or other flight condition you want to maintain. This helps you identify which instrument indications deserve the most attention.
Look at the relevant flight instruments. Compare their indications instead of relying on a single reading. Notice whether values are steady or changing.
Decide what the indications tell you about the airplane. Is it climbing or descending? Is the heading changing? Is the airspeed increasing or decreasing?
Make the appropriate control or power adjustment when needed. Use smooth inputs, continue your cross-check, and confirm that the airplane responds as expected.
Practical Example: Detecting an Unwanted Descent
Imagine you are flying in smooth air and want to maintain an altitude of 4,500 feet. During your scan, you notice these indications:
The airplane is below the target altitude and still descending. The altimeter and VSI support the same conclusion.
Check the attitude indicator and other relevant instruments to identify the appropriate correction.
If the attitude indicator confirms a lower-than-intended pitch attitude, smoothly adjust pitch to arrest the descent and regain the target altitude.
Adjust power if needed to maintain the desired flight performance.
Continue checking the altimeter, attitude indicator, VSI, and airspeed. Confirm that the descent has stopped and that the airplane returns to the target altitude.
Once the desired attitude and performance are established, adjust trim as necessary to relieve control pressure.
How to Improve Your Instrument Cross-Check
A reading tells you the present condition. A trend helps you recognize where the airplane is going. For example, an altitude that is slowly decreasing can reveal a developing descent before the deviation becomes large.
Large control inputs can cause the airplane to move beyond the desired altitude or heading. Make an appropriate correction, allow the instruments to respond, and check the result before making another adjustment.
Do not make repeated control changes just because one needle moves. Some instrument indications, including vertical speed, may lag behind changes in the airplane's attitude.
Compare the available indications before deciding whether a correction is necessary. Small, temporary variations do not always require immediate control inputs.
An effective instrument cross-check combines observation, interpretation, and aircraft control. Know what you want the airplane to do, compare instrument indications, and recognize meaningful changes.
Make smooth corrections when necessary, then verify the result. Continue the scan throughout the maneuver.
Instrument Scanning During Flight Maneuvers
Your instrument scan should change with the maneuver you are flying. The instruments that matter most during straight-and-level flight are not always the same as those you use during a climb, descent, or turn.
You still need to monitor the airplane's complete attitude and performance. The difference is how much attention you give to each instrument.
Adjust Your Scan to the Maneuver
Your goal is to maintain a constant altitude, heading, and desired airspeed.
Use the VSI as a supporting indication of vertical speed and check engine instruments as appropriate.
Give regular attention to altitude and heading. A small change in either can be an early sign that your flight path is drifting away from the desired condition.
During a constant-airspeed climb, your goal is to gain altitude while maintaining the selected climb speed and heading.
Check engine indications to verify the climb power setting. Monitor the altimeter as you approach the target altitude.
In a constant-airspeed climb, airspeed is especially important. Do not chase a particular vertical speed if your objective is to maintain climb airspeed.
During a descent, you must maintain the desired airspeed or descent rate while controlling heading and monitoring altitude.
Continue checking heading and engine indications. The balance between pitch and power depends on the desired descent performance.
A constant-airspeed descent and a constant-rate descent do not require exactly the same scan priorities. Give greater attention to the variable you are trying to maintain.
During a level turn, you need to control bank angle while maintaining altitude and monitoring the changing heading.
Continue checking airspeed, vertical speed, and power as needed.
Do not become so focused on the heading indicator that you forget altitude and pitch control. Begin rolling out before reaching the target heading to avoid overshooting.
| Maneuver | Main Scan Focus |
|---|---|
| Straight-and-Level | ALT · HI · ASI |
| Constant-Airspeed Climb | ASI · AI · HI |
| Descent | ASI or VSI · ALT · AI |
| Level Turn | AI · ALT · HI · TC |
These are priorities, not a complete scan. Keep checking other relevant flight and engine instruments.
Changing Your Scan During Transitions
The transition between maneuvers often requires extra attention. Your scan should change as the airplane enters, maintains, and exits the new flight condition.
When entering a climb, descent, or turn, use the attitude indicator and appropriate power setting to establish the desired flight condition.
Once the airplane begins responding, give more attention to the airspeed, vertical speed, altitude, or turn indications needed for the maneuver.
As you approach the desired altitude or heading, adjust your scan and begin the appropriate level-off or rollout before overshooting.
Lowering flaps, extending landing gear, or changing engine power can affect the airplane's pitch attitude, airspeed, or vertical speed.
During these changes, increase attention to the relevant flight and engine instruments. Make the necessary adjustments using the procedures and limitations in your aircraft's AFM/POH.
Your instrument scan must adapt to the maneuver. During level flight, concentrate on maintaining altitude and heading. During a constant-airspeed climb, monitor airspeed closely. During descents and turns, adjust your scan to the performance you are trying to maintain.
Always look ahead to the next change. Anticipate level-offs, rollouts, and configuration changes while maintaining a complete instrument cross-check.
Common Instrument Scanning Errors
Even experienced pilots can develop instrument scanning errors. These mistakes may prevent you from noticing changes in altitude, heading, or airspeed.
The FAA identifies three common instrument cross-check errors: fixation, omission, and emphasis. Understanding the difference can help you recognize and correct poor scanning habits.
The Three Main Instrument Scan Errors
Fixation happens when you stare at one instrument for too long and stop checking the other information you need.
During a 90° turn, a pilot keeps watching the heading indicator, waiting for the target heading.
Meanwhile, the airplane begins losing altitude, but the pilot does not notice because the altimeter is no longer being checked.
Take brief looks at the heading indicator, then continue checking attitude, altitude, and other relevant instruments.
Return more frequently to the heading indicator as you approach the rollout point.
Omission means leaving an important instrument out of your scan. The pilot may be checking several instruments, but one necessary indication is consistently missed.
After completing a turn, a pilot checks the attitude indicator and altimeter but forgets the heading indicator.
The airplane continues changing heading slightly, and the pilot fails to detect the deviation.
Anticipate which instruments will be important after each maneuver.
Following a rollout, check the heading indicator to confirm that the selected heading is being maintained.
Emphasis occurs when you give too much importance to one instrument instead of using the combination of indications needed to understand the airplane's performance.
A pilot relies mainly on the attitude indicator to maintain level flight.
Although the pilot occasionally checks the altimeter, its gradual movement receives too little attention. The airplane drifts away from the assigned altitude.
Use the attitude indicator to establish pitch and bank, but compare it with performance indications.
To maintain altitude precisely, include the altimeter in your regular cross-check.
Two Other Habits That Reduce Scan Quality
Moving your eyes rapidly across all the instruments is not useful if you do not understand their indications.
Better approach: take short, purposeful looks. Identify the reading or trend you need before moving to the next instrument.
Repeatedly reacting to small needle movements can lead to unnecessary control inputs, especially when an instrument responds with some delay.
Better approach: compare related indications, recognize meaningful trends, and allow the airplane to respond to appropriate corrections.
High workload, turbulence, or an unexpected instruction can interrupt your cross-check. If you notice that your scan is becoming ineffective:
- Maintain aircraft control. Reestablish a reliable attitude reference.
- Check the essential indications. Confirm the altitude, heading, airspeed, and other information relevant to your maneuver.
- Restore a purposeful scan. Look for meaningful deviations, make appropriate corrections, and verify the results.
The three classic instrument scanning errors are fixation, omission, and emphasis.
Avoid staring at one instrument, leaving necessary indications out of your scan, or relying too heavily on a single reading.
A reliable instrument cross-check uses the appropriate instruments together to build an accurate picture of the airplane's attitude and performance.
Instrument Scanning Practice and Review Questions
Understanding instrument scanning techniques is important, but you also need to interpret instrument indications and make correct decisions.
The following exercises will help you practice instrument cross-check, interpretation, and aircraft control.
How to Practice: Read each flight situation, examine the instrument indications, and decide what the airplane is doing.
Think about your answer before selecting Show Explanation. Then compare your reasoning with the suggested solution.
Practice Exercises: Read the Instruments
You are flying straight and level at 4,500 feet, trying to maintain a heading of 090°. After answering a radio call, you notice these indications:
What unintended change is occurring? Which two instruments reveal it, and how would you return to your assigned heading?
Show Explanation
Interpretation: The airplane is turning right without an intended heading change. The heading has moved from 090° to 103° and is still increasing. The attitude indicator confirms a slight right bank. Altitude is being maintained.
Action: Smoothly return the wings to level to stop the unwanted turn. Then make a controlled left turn back toward heading 090°, anticipating the rollout without overcorrecting.
Verify: Check that the heading stabilizes at 090°, the wings are level, and altitude and airspeed remain appropriate. Continue your complete instrument cross-check.
You are performing a constant-airspeed climb at a selected speed of 90 knots. Your instrument indications are:
The airplane is climbing, but is the maneuver being performed correctly? Which indication deserves particular attention?
Show Explanation
Interpretation: The airplane is climbing, but airspeed is below the selected 90 KIAS and continues to decrease.
The higher-than-expected pitch attitude suggests that the nose may be too high for the desired climb speed at the current power setting.
Action: Verify the engine power setting and adjust pitch appropriately to regain and maintain the selected safe climb airspeed.
Verify: Watch the airspeed trend, climb performance, attitude, and heading. Do not try to maintain a particular vertical speed at the expense of the required climb airspeed.
You are making a level right turn toward a heading of 180°. The following indications appear during your scan:
Which instrument becomes especially important as you approach 180°? What should you anticipate?
Show Explanation
Interpretation: The airplane is turning right, approaching the selected heading, and maintaining altitude.
Action: Give increasing attention to the heading indicator while continuing to monitor pitch, bank, and altitude.
Anticipate the rollout and begin reducing bank at an appropriate lead point based on turn rate and aircraft response.
Verify: Confirm wings-level flight near heading 180°, with altitude maintained and no continuing unwanted turn.
Instrument Scanning Review Questions
Test your understanding of the main concepts covered in this lesson. Try answering each question before revealing the explanation.
01 What is the main purpose of an instrument cross-check?
To observe and compare flight instrument indications, understand the airplane's attitude and performance, and identify changes that may require correction.
02 In a selected radial scan, which instrument is used as the central reference?
The attitude indicator. The pilot moves from it to another relevant instrument and then returns before checking another indication.
03 Why is the attitude indicator alone not enough to maintain a precise altitude?
The attitude indicator shows pitch and bank, not actual altitude. The altimeter is needed to verify whether the airplane is maintaining the assigned altitude.
04 During a constant-airspeed climb, airspeed begins decreasing. What should you check?
Compare the airspeed indication with pitch attitude and the engine power setting. Adjust as necessary to maintain the selected safe climb airspeed. Continue monitoring the airplane's climb and heading.
05 A pilot stares at the heading indicator throughout a turn. Which scanning error is this?
Fixation. The pilot is concentrating on one instrument for too long and may fail to notice important changes in other indications.
06 When approaching the end of an instrument turn, why should you monitor the heading indicator closely?
It shows your progress toward the selected heading and helps you anticipate the rollout. You must still cross-check attitude and altitude to maintain control during the transition.
07 Why should you avoid reacting to every small movement of the VSI?
The vertical speed indicator can respond with a delay, and small variations do not always require a control correction.
Compare VSI information with the attitude indicator, altimeter, and other relevant instruments before acting.
08 After making a control correction, what should a pilot do next?
Continue the cross-check and verify the result. Confirm that the airplane is responding as intended. Adjust again if necessary without making excessive control inputs.
You can repeat these exercises on the ground using instrument panel illustrations or an aviation training simulator.
For additional practice, ask your flight instructor to introduce small changes in altitude, heading, or airspeed during an appropriate training session.
Focus on recognizing the indications, interpreting the situation, and making smooth corrections according to the aircraft's operating procedures.
Effective instrument scanning is not simply a memorized eye movement. It is the ability to recognize what your instruments are telling you and respond appropriately.
With practice, cross-check, interpretation, and aircraft control become a continuous process that helps you maintain accurate and stable flight.
