ASC600 - Aircraft Stability and Control

Outline information
Schools offering this subject
Last revision date Mar 16, 2020 10:09:21 AM
Last review date Mar 16, 2020 10:09:21 AM

Subject Title
Aircraft Stability and Control

Subject Description

In this course, students learn about those aspects of aircraft static and dynamic stability that can be investigated when the aircraft is assumed to behave like a rigid body. Topics on static stability covered include: factors determining the longitudinal static stability of aircraft; longitudinal control of aircraft; expressions for the stick forces required for longitudinal control; the effects of fuselages, propulsion systems, etc. on longitudinal static stability; lateral static stability and control, directional static stability and control. The following aspects of dynamic stability are studied: longitudinal and lateral - directional modes of transient aircraft motion; the stability of the longitudinal and lateral- directional modes; aircraft handling qualities and the stability criteria required for satisfactory longitudinal and lateral-directional flying qualities.

Credit Status
One Credit

Learning Outcomes
Upon successful completion of this subject the student will be able to:

1. Write mathematical expressions for the lift produced by an airplane wing, the lift produced by its tail and the total lift acting on the airplane and use these expressions to calculate required aerodynamic quantities.

2. Write mathematical expressions for the wing pitching moment, the tail pitching moment and the total pitching moment acting on an aircraft and use these expressions to calculate required aerodynamic quantities.

3. State the conditions required for an aircraft to be longitudinally balanced and statically stable.

4. Define parameters, such as stick-free neutral point, stick-free static margin, stick-fixed neutral point and stick-fixed static margin, which have an important influence on aircraft longitudinal stability and describe how these parameters affect that stability.

5. Calculate the locations of the two neutral points and the values of the two static margins of learning outcome four for a given aircraft.

6. Describe those design features of an aircraft that increase its longitudinal stability and explain why they have that effect.

7. Calculate the elevator angle to trim for a given aircraft at a given speed.

8. Solve stability problems which require the evaluation or manipulation of mathematical expressions for the elevator hinge moment, the stick-force to trim and the stick-force.

9. Describe qualitatively the effects of fuselages, propulsion systems, etc. on aircraft trim and longitudinal stability

10. Discuss qualitatively the influence of factors such as weathercock stability, sidewash, propeller fin effect on static directional stability of an aircraft and explain how directional control is achieved.

11. Discuss qualitatively the factors affecting the static rolling stability of aircraft and the mechanisms by which rolling control is achieved.

12. Describe qualitatively the longitudinal modes of transient aircraft motion and use the roots of the appropriate eigenvalue problem to calculate the frequencies of these modes for a given aircraft and to determine if the aircraft is longitudinally stable.

13. Describe qualitatively the lateral-directional modes of transient aircraft motion.

14. Define and explain the term "airplane handling quality" (AHQ) and describe the criteria which the dynamical longitudinal modes must satisfy if an aircraft is to have satisfactory longitudinal flying qualities.

15. Describe the criteria which the dynamical lateral-directional modes must satisfy if an aircraft is to have satisfactory lateral-directional flying qualities.

Essential Employability Skills
Communicate clearly, concisely and correctly in the written, spoken and visual form that fulfils the purpose and meets the needs of the audience.

Respond to written, spoken, or visual messages in a manner that ensures effective communication.

Execute mathematical operations accurately.

Apply a systematic approach to solve problems.

Use a variety of thinking skills to anticipate and solve problems.

Locate, select, organize, and document information using appropriate technology and information systems.

Analyze, evaluate, and apply relevant information from a variety of sources.

Show respect for diverse opinions, values, belief systems, and contributions of others.

Manage the use of time and other resources to complete projects.

Academic Integrity
Seneca upholds a learning community that values academic integrity, honesty, fairness, trust, respect, responsibility and courage. These values enhance Seneca's commitment to deliver high-quality education and teaching excellence, while supporting a positive learning environment. Ensure that you are aware of Seneca's Academic Integrity Policy which can be found at: Review section 2 of the policy for details regarding approaches to supporting integrity. Section 2.3 and Appendix B of the policy describe various sanctions that can be applied, if there is suspected academic misconduct (e.g., contract cheating, cheating, falsification, impersonation or plagiarism).

Please visit the Academic Integrity website to understand and learn more about how to prepare and submit work so that it supports academic integrity, and to avoid academic misconduct.

All students and employees have the right to study and work in an environment that is free from discrimination and/or harassment. Language or activities that defeat this objective violate the College Policy on Discrimination/Harassment and shall not be tolerated. Information and assistance are available from the Student Conduct Office at

Accommodation for Students with Disabilities
The College will provide reasonable accommodation to students with disabilities in order to promote academic success. If you require accommodation, contact the Counselling and Accessibility Services Office at ext. 22900 to initiate the process for documenting, assessing and implementing your individual accommodation needs.