Test your knowledge of aviation maintenance human factors, including the PEAR and SHEL models, MEDA, fatigue, stress, communication, complacency, and the Dirty Dozen. These AMT study questions are useful for written, oral, and practical exam preparation.
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Fill in the Blanks
- The PEAR model stands for People, __________________, Actions, Resources.
- Human factors programs address physical, physiological, psychological, and __________________ aspects.
- Planned __________________ breaks help reduce physical and mental fatigue.
- Annual __________________ testing ensures optimal performance.
- The physical work environment includes temperature, humidity, __________________, and noise control.
- The organizational environment focuses on cooperation, communication, shared values, and ________________.
- Job Task Analysis (JTA) identifies __________________, skills, and attitudes for each task.
- __________________ investigates errors to identify root causes.
- MEDA is based on positive employee __________________ and multiple contributing factors.
- In the SHEL model, S = Software, H = Hardware, E = __________________, L = Liveware.
- Active failures have immediate __________________, while latent failures may remain hidden.
- __________________ can be unintentional (slips, mistakes) or intentional (violations).
- Transposing __________________ values is an example of an unintentional error.
- Excessive __________________ from management or self-imposed can lead to rushing and cutting corners.
- __________________ during maintenance can be mental or physical.
- The Dirty Dozen refers to 12 human factors that degrade __________________.
- __________________ occurs when a technician has performed a task repeatedly without incident.
- Lack of __________________ includes missing tools, parts, or technical documentation.
- Lack of __________________ prevents raising safety concerns.
- Stressors can be physical, psychological, or __________________.
True or False
- Human error is completely avoidable in aviation maintenance. (True/False)
- Complacency can result from repetitive tasks. (True/False)
- Fatigue only affects physical performance, not cognition. (True/False)
- Unsafe norms are usually written procedures. (True/False)
- MEDA focuses on identifying contributing factors rather than blaming employees. (True/False)
- Active errors have immediate consequences. (True/False)
- Providing proper tools and parts is part of PEAR Resources. (True/False)
- The SHEL Model focuses primarily on the non-technical skills required for effective teamwork. (True/False)
- Lack of communication during shift change is not a serious concern. (True/False)
- Assertiveness involves being aggressive. (True/False)
- Complacency can be mitigated by verifying inspection items before signing. (True/False)
- Oral and written communication is essential for shift turnovers. (True/False)
- Unsafe norms can include skipping inspection steps. (True/False)
- Fatigue can be mitigated only by caffeine. (True/False)
- Pressure to complete tasks quickly can compromise safety. (True/False)
Knowledge Application Questions
- Define human error in aviation maintenance.
- Explain the difference between active and latent failures.
- How does MEDA help reduce errors?
- What are physical stressors in maintenance?
- How does fatigue affect performance?
- Describe how poor teamwork can contribute to two factors from the Dirty Dozen.
- Complacency is often caused by repetitive tasks. List three proactive mitigation steps a maintenance technician must take to prevent complacency on a routine check.
- Describe three different types of resources and give a specific maintenance error resulting from the lack of each type.
- Define an intentional error (violation). Explain the difference between a routine violation and an optimizing violation.
- How do stressors affect technicians?
Multiple Choice Questions
- The PEAR Human Factors model was specifically designed for application within which aviation domain?
a. Flight Deck Operations and Crew Resource Management.
b. Air Traffic Control and Organizational Safety Management Systems.
c. Aircraft Maintenance and Engineering. - Job Task Analysis (JTA) is designed to formally identify the essential elements needed for task execution, specifically:
a. Required manpower, organizational budgets, and aircraft age.
b. Necessary knowledge, demonstrated skills, and appropriate attitudes.
c. Prevailing weather conditions, daily flight schedules, and shift duration. - The primary goal of the MEDA investigation process is to:
a. Identify the contributing factors and system weaknesses that allowed the error to occur.
b. Formally assign disciplinary action based on the identified human error.
c. Calculate the financial cost of the error to the organization. - Human error can be broadly categorized into which of the following groups?
a. Slips, lapses, and mistakes.
b. Actions, behaviours, and reactions.
c. Physical, cognitive, and procedural errors. - Latent failures are:
a. Immediate.
b. Intentional.
c. Hidden system weaknesses. - Complacency occurs due to:
a. Lack of sleep.
b. Repetition and false confidence.
c. Poor tools. - Fatigue primarily impairs performance by reducing a technician's ability to:
a. Perform basic, well-rehearsed procedural steps quickly and without physical error.
b. Maintain focused attention and accurately track multiple concurrent tasks.
c. Communicate complex technical issues to colleagues or supervision. - Lack of Assertiveness is primarily dangerous because it directly increases the risk of:
a. Non-reporting of hazardous conditions or acceptance of unsafe instruction.
b. Errors in planning due to poor technical knowledge.
c. Intentional procedural deviations to save time. - Distractions are dangerous in maintenance work primarily because they often lead to:
a. Tasks being resumed at the wrong point, resulting in omissions.
b. Reduced physical strength during demanding tasks.
c. Increased reliance on supervisory oversight. - Unsafe norms are best characterized as:
a. Formal, documented intentional violations for gain.
b. Accepted, unwritten practices that deviate from SOPs and compromise safety.
c. Formal, approved procedures that contain latent design flaws. - The Dirty Dozen was identified by:
a. FAA.
b. Transport Canada.
c. EASA. - Common, critical maintenance errors primarily involve:
a. Improper component installation and leaving foreign objects/tools.
b. Handwriting errors and misfiling job cards.
c. Intentional safety bypasses for time/cost savings. - Shift work primarily affects human performance and safety due to:
a. Increased reliance on improvised tools when specialty shops are closed.
b. Reduced access to high-quality technical documentation during night shifts.
c. Disruption of the body's natural 24-hour performance cycle (Circadian Rhythm). - In the PEAR model, which grouping accurately represents the category of Resources?
a. Technical manuals, specialized tools, and spare parts.
b. Experience, training, and coordination skills.
c. Temperature, lighting, and noise control. - In a maintenance context, complacency is most accurately indicated by a technician's increased reliance on:
a. Memory and expectation, leading to inadequate self-monitoring and verification.
b. Management input for all critical decision-making.
c. Strict adherence to the formal procedural steps (SOPs). - In a team environment, Assertiveness is crucial for safety primarily because it allows a technician to:
a. Reduce individual task completion time and effort.
b. Quickly identify Latent Failures in organizational procedures.
c. Effectively challenge authority and prevent the acceptance of hazards. - The primary risk associated with a technician's Lack of Knowledge or inadequate training is that it typically leads to an error categorized as:
a. an unintentional error of execution.
b. an unintentional error of planning.
c. an intentional deviation from procedure. - Which of the following best represents a physiological stressor that directly impacts the body's internal state?
a. Fatigue and Dehydration resulting from extended duty periods.
b. Relationship issues and lack of management support.
c. Exposure to excessive noise and temperature extremes. - Communication is most critical because the highest risk of information loss occurs:
a. During pre-job briefings with Quality Control (QC).
b. When supervisors give general daily task allocations.
c. At task or shift handover/turnover points. - In the Swiss Cheese Model, which option represents an Active Failure rather than a Latent Failure?
a. The maintenance manual contains an outdated torque value for a critical fastener.
b. A supervisor frequently delays the replacement of broken safety equipment.
c. A technician fails to remove the control lock pins during pre-flight checks. - The "3-step rule" primarily ensures the technician recovers by re-establishing:
a. Situational awareness and verifying preceding completed steps.
b. Maximum speed to compensate for lost time.
c. A written report of the interruption before resuming work. - The Circadian Rhythm primarily governs the body's internal cycle for:
a. Vigilance and performance, peaking during daylight hours.
b. Short-term stress response and adrenaline output.
c. Digestion rate and caloric absorption efficiency. - An Unsafe Norm is best exemplified by:
a. A newly written SOP containing an operational mistake.
b. A technician intentionally using a modified, unapproved tool for a critical task.
c. Routinely bypassing a mandatory inspection step to save time. - Which Dirty Dozen factor involves rushing tasks?
a. Complacency.
b. Pressure.
c. Lack of awareness. - Which factor is about interpersonal collaboration?
a. Lack of teamwork.
b. Fatigue.
c. Complacency. - Which action represents an intentional human failure type?
a. Forgetting to record the torque value after installation.
b. Deliberately substituting an unapproved part to expedite a repair.
c. Incorrectly calculating the required pressure due to a formula error. - The most effective personal defense against complacency is to consistently practice:
a. Relying on memory and expectation for recurring checks.
b. Prioritizing speed and efficiency over meticulous documentation.
c. Self-monitoring, verification, and treating every task step as if it were the first time. - Distraction during a maintenance task most often results in a critical error categorized as:
a. an unintentional error in manual action or execution.
b. an unintentional error in planning or procedure.
c. an unintentional omission of a task step. - Fatigue's most critical impact on maintenance safety is the degradation of:
a. Judgment and the ability to accurately assess risk.
b. Fine motor skills and physical strength.
c. Tolerance for external stressors like noise and heat. - Which factor is categorized as a Physical Stressor?
a. Excessive noise and poor environmental lighting.
b. Pressure from time constraints and schedules.
c. Interpersonal conflict and family problems.
Answer Key
Fill in the Blanks Answers
1. Environment
2. psychosocial
3. rest
4. vision
5. lighting
6. culture
7. knowledge
8. MEDA
9. intent
10. Environment
2. psychosocial
3. rest
4. vision
5. lighting
6. culture
7. knowledge
8. MEDA
9. intent
10. Environment
True or False Answers
1. false
2. true
3. false
4. false
5. true
6. true
7. true
8. false
2. true
3. false
4. false
5. true
6. true
7. true
8. false
Knowledge Application Answers
1. A human action with unintended consequences that may compromise safety.
2. Active failures are immediate errors; latent failures are hidden flaws in the system.
3. Investigates errors to identify contributing factors and prevent recurrence without blame.
4. Temperature extremes (heat/cold), excessive noise, poor lighting, vibration, confined spaces, and physically demanding tasks.
5. cognitive ability (slowing decision-making), attention (leading to slips and lapses), reaction time, coordination, and short-term memory.
2. Active failures are immediate errors; latent failures are hidden flaws in the system.
3. Investigates errors to identify contributing factors and prevent recurrence without blame.
4. Temperature extremes (heat/cold), excessive noise, poor lighting, vibration, confined spaces, and physically demanding tasks.
5. cognitive ability (slowing decision-making), attention (leading to slips and lapses), reaction time, coordination, and short-term memory.
Multiple Choice Answers
1. c
2. b
3. a
4. a
5. c
6. b
7. b
8. a
9. a
10. b
11. b
12. a
13. c
14. a
15. a
2. b
3. a
4. a
5. c
6. b
7. b
8. a
9. a
10. b
11. b
12. a
13. c
14. a
15. a
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