Free CAAS SAR-66 Module 9 Human Factors (MCQ) Practice Questions

Sample Practice Questions

Try these 10 sample questions from the CAAS SAR-66 Module 9 Human Factors (MCQ) practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1What is the main aim of applying human factors in aircraft maintenance?

   1. A.Optimise the relationship between people and systems for safe, efficient workCorrect answer: A
   2. B.Standardise the physical strength of engineers for every maintenance task
   3. C.Replace practical maintenance procedures with individual technical judgement
   4. D.Assess aircraft reliability independently of the people maintaining them

   Explanation: CAP 715 states: "The aim of human factors is to optimise the relationship between maintenance personnel and systems" Human factors considers people together with their equipment, procedures and environment. It seeks safer, more efficient work and well-being; it does not standardise people, replace procedures or isolate reliability from people.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 1, section 1.4.3, page 2

2. 2Which retinal receptors are chiefly responsible for colour discrimination and fine detail in good light?

   1. A.Rods concentrated around the retinal periphery
   2. B.Cones concentrated in the central retinaCorrect answer: B
   3. C.Nerve fibres forming the optic nerve junction
   4. D.Muscles surrounding the crystalline lens

   Explanation: CAP 715 states: "Cones function in good light and are capable of detecting fine detail and are colour sensitive." Cones provide colour and fine-detail vision. Rods favour low light and peripheral movement; optic-nerve fibres transmit signals and ciliary muscles change lens shape.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 2, section 2.5.1, page 3

3. 3Several team members notice an unresolved concern, but each assumes somebody else will address it. What is this called?

   1. A.Group polarisation
   2. B.Social loafing
   3. C.Intergroup conflict
   4. D.Diffusion of responsibilityCorrect answer: D

   Explanation: CAP 715 states: "each member of the group or team assuming that ‘someone else will do it’." Diffusion means personal responsibility is diluted in the group. Polarisation changes decision extremity, loafing reduces effort, and intergroup conflict concerns rivalry between groups.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 3, section 2.5.2, page 3

4. 4Why can an illness affect maintenance work even when the engineer can still perform the physical movements?

   1. A.Illness affects only the strength needed to use tools
   2. B.Illness can also reduce cognitive performance such as concentrationCorrect answer: B
   3. C.Physical mobility demonstrates that technical judgement is unaffected
   4. D.Cognitive performance improves whenever physical symptoms are minor

   Explanation: CAP 715 states: "Fitness and health can have a significant affect upon job performance (both physical and cognitive)." Fitness includes cognitive as well as physical performance. Preserved movement or apparently minor physical symptoms does not establish that attention and judgement are unaffected.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 4, section 1.5.1, page 2

5. 5How can workplace noise create an immediate safety risk without causing hearing loss?

   1. A.By making a louder background improve the contrast of a warning tone
   2. B.By masking a warning signal or a spoken messageCorrect answer: B
   3. C.By shifting speech into frequencies that are easier to distinguish
   4. D.By allowing familiarity with noise to substitute for hearing a message

   Explanation: CAP 715 states: "can interfere with verbal communication and mask warnings" Background noise can obscure important auditory information even when hearing is undamaged. A louder background does not inherently improve warning contrast or shift speech frequencies. Familiarity with a noise does not establish that a particular message was heard.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 5, section 1.1, page 1

6. 6Why can the force an engineer applies vary with working posture?

   1. A.A fixed load requires the same muscular effort at different joint angles
   2. B.Mechanical advantage changes with the load, joints and muscle attachmentsCorrect answer: B
   3. C.The weight of the load determines available force independently of body geometry
   4. D.Bending a joint increases leverage in proportion to how far it is bent

   Explanation: CAP 715 states: "the mechanical advantage provided by the relative positions of the load, muscle connections, and joints." Force capacity is influenced by biomechanical geometry. The same load can require different muscular effort in different postures; load weight alone does not describe leverage; leverage does not simply increase in proportion to joint bending.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 6, section 1.2.2, page 3

7. 7In an exchange between two engineers, what is meant by communication feedback?

   1. A.The receiver's response to the sender's messageCorrect answer: A
   2. B.The background sound present during a conversation
   3. C.The written format chosen for the original instruction
   4. D.The technical vocabulary used before a message is sent

   Explanation: CAP 715 states: "The response constitutes feedback." Feedback is the response returned by the recipient, from acknowledgement to a detailed reply. Noise, format and vocabulary are different aspects of communication.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 7, section 1.1.2, page 1

8. 8What distinguishes a constant error from a variable error in Reason's classification?

   1. A.A constant error is always intentional; a variable error is accidental
   2. B.A constant error occurs at every task stage; a variable error occurs only once
   3. C.A constant error cannot be influenced by system design
   4. D.A constant error follows a systematic pattern rather than a random oneCorrect answer: D

   Explanation: CAP 715 states: "constant errors in (B) follow some kind of consistent, systematic (yet erroneous) pattern." The distinction is patterned versus random error, not intention, stage count or inevitability. A systematic pattern may offer opportunities for prediction and control.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 8, section 1.2.1, page 3

9. 9What information makes a workplace warning sign useful for avoiding a hazard?

   1. A.The equipment category, with the response left to personal interpretation
   2. B.The safety department’s contact details instead of the particular danger
   3. C.The hazard, its danger and what the person should do or avoidCorrect answer: C
   4. D.The required protective action without identifying the hazard it addresses

   Explanation: CAP 715 states: "clearly identify the hazard(s); • describe the danger (i.e. electric shock, radiation, etc); • inform employees what to do or not to do." An effective warning connects the hazard and danger with a response. An equipment category or contact details do not convey that information, while an action alone leaves the particular hazard unidentified.

   Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 9, section 1.2.3, page 2

10. 10In the SHEL model, which element includes maintenance manuals and checklist layout?

    1. A.Hardware
    2. B.SoftwareCorrect answer: B
    3. C.Environment
    4. D.Liveware

    Explanation: CAP 715 states: "Software (e.g. maintenance procedures, maintenance manuals, checklist layout," Software includes the procedures and information used to perform work. Hardware is physical equipment, environment is the working setting, and liveware means the people.

    Reference: CAP 715 — An Introduction to Aircraft Maintenance Engineering Human Factors — Chapter 1, section 1.5.1, page 2