100+ Free SAR-66 Module 9 Practice Questions

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2026 Statistics

Key Facts: SAR-66 Module 9 Exam

20 questions

Module M09 MCQ count (Cat A/B1/B2)

CAAS AC 66-13 (Rev 1)

25 minutes

Time allowed for M09 MCQ

CAAS AC 66-13 (Rev 1)

75%

Pass mark per SAR-66 module

SAR-66 Appendix 2

5 years

Validity of M09 MCQ and M50 HF essay passes

SAR-66.25 / SAR-66 Issue 2 Amendment 6

S$87.20

Fee per basic knowledge exam subject (from 1 Jan 2026)

ANO Twelfth Schedule / Air Navigation (Amendment) Order 2025

9 sections

Module 9 syllabus blocks (9.1–9.9)

CAAS AC 66-13 (Rev 1)

3 options

Official MCQ choices per question

SAR-66 Appendix 2

CAAS SAR-66 Module 9 Human Factors is examined by a 20-question MCQ paper in 25 minutes (Cat A/B1/B2) with a 75% pass mark and no penalty marking. Official MCQs use three options; this bank uses four. Content follows AC 66-13 sections 9.1–9.9: general (Murphy's Law), human performance and limitations, social psychology, factors affecting performance, physical environment, tasks, communication, human error, and workplace hazards. M09 MCQ and the related M50 essay component each remain valid for 5 years under SAR-66.

Sample SAR-66 Module 9 Practice Questions

Try these sample questions to test your SAR-66 Module 9 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In SAR-66 Module 9, Murphy's Law is cited to explain why maintenance error controls are needed. What does it state?

A.If a part can be fitted or connected incorrectly, eventually someone will do so

B.The chance of error doubles with every extra task on a shift

C.Human error can be eliminated completely with enough training

D.Errors are always made by the least experienced technician on the team

Explanation: Murphy's Law in maintenance human factors means that if something can be assembled, fitted or connected the wrong way, sooner or later someone will do it. It supports error-tolerant design and independent inspection.

2Why does CAAS SAR-66 Module 9 emphasise human factors in aircraft maintenance, not only in flight operations?

A.A significant share of aircraft accidents and incidents has been linked to maintenance error

B.Only maintenance staff are excluded from human-factors training elsewhere

C.Human factors apply only to engineering work and never to pilots

D.Maintenance is performed in flight and directly changes handling qualities

Explanation: Accident and incident analysis shows maintenance human error is a recognised contributor to aviation accidents, which is why SAR-66 requires dedicated Human Factors knowledge for certifying staff.

3A latent condition (latent failure) in maintenance human error is best described as:

A.An error detected and corrected before release to service

B.A software fault in an electronic control unit

C.An error that always appears on the first flight after maintenance

D.An error whose harmful effect may remain dormant until later conditions expose it

Explanation: A latent condition lies dormant in the system and may only become evident later when combined with other factors or triggers, sometimes long after the maintenance task.

4Taking human factors into account in aircraft maintenance primarily means considering:

A.How people interact with procedures, equipment, environment and each other when performing work

B.Only the certified empty mass of the aircraft

C.Only the purchase price of replacement parts

D.Only the mechanical strength of tools and fixtures

Explanation: Human factors study human capabilities and limitations in the workplace — people, procedures, tools/equipment, environment and social interactions — and how those interfaces affect safe maintenance.

5An active failure in Reason's model of accident causation is typically:

A.An unsafe act by a front-line worker that has an immediate or near-term effect

B.Any weather-related delay at an airport

C.A type-certificate change issued by the authority

D.A long-standing organisational weakness that has never caused an event

Explanation: Active failures are unsafe acts (errors or violations) by front-line personnel that have relatively immediate effects. Latent conditions are deeper organisational or design weaknesses that may lie dormant.

6Which statement best explains why incidents attributed to human error remain a Module 9 focus?

A.Human performance limitations and workplace factors repeatedly appear in maintenance-related occurrences

B.Human error only occurs during initial training and never after licensing

C.Regulators require human-factors study only for pilots, not engineers

D.Technical failures now cause almost all accidents, so human factors is optional

Explanation: Occurrence investigations repeatedly show human performance limits and workplace factors contributing to maintenance-related events, which is why Module 9 is mandatory for SAR-66 AML categories.

7Error-tolerant design in maintenance tooling and components is intended to:

A.Make incorrect assembly or connection difficult or impossible where practicable

B.Guarantee that fatigue never affects night-shift workers

C.Allow technicians to skip independent inspections permanently

D.Remove the need for any maintenance documentation

Explanation: Error-tolerant (or poke-yoke style) design reduces the chance that parts can be fitted the wrong way, supporting Murphy's Law thinking. It complements — it does not replace — procedures and inspection.

8Under SAR-66, a pass in the Module M09 Human Factors MCQ paper is typically valid for:

A.5 years

B.10 years, the same as most other basic modules

C.Indefinitely with no expiry

D.12 months only

Explanation: SAR-66 states that passes in Human Factors (M09) and Aviation Legislation (M10) MCQ papers (and the related M50 essay passes) are each valid for 5 years, whereas most other basic module passes are valid for 10 years.

9Rods in the human eye are primarily responsible for:

A.Night and low-light vision with poor colour detail

B.Focusing the lens during near work only

C.Detecting only ultraviolet wavelengths

D.Fine colour discrimination in bright light

Explanation: Rods dominate peripheral and scotopic (low-light) vision and provide little colour discrimination. Cones support colour and high-acuity vision in brighter light.

10Presbyopia is best described as:

A.Age-related loss of near focusing ability as the lens stiffens

B.Complete colour blindness from birth

C.Sudden total blindness after noise exposure

D.Short-sightedness from an elongated eyeball

Explanation: Presbyopia is the age-related reduction in the eye's ability to accommodate for near vision as the crystalline lens loses flexibility.

About the SAR-66 Module 9 Exam

CAAS SAR-66 Module M09 (Human Factors) is a basic knowledge module required for Singapore Aircraft Maintenance Licence categories A, B1 and B2. It covers why human factors matter in maintenance, human performance limits, social psychology, performance-shaping factors, the physical environment and tasks, communication, human error models, and workplace hazards. Per AC 66-13 (Rev 1), the MCQ paper has 20 questions in 25 minutes with a 75% pass mark. SAR-66 also requires the separate M50 combined essay paper (Modules 07/09/10). M09 MCQ and M50 Human Factors essay passes are each valid for 5 years.

Questions

20 scored questions

Time Limit

25 minutes

Passing Score

75%

Exam Fee

S$87.20 per basic knowledge examination subject (Air Navigation Order Twelfth Schedule, rate from 1 January 2026; previously S$80). Confirm on CAPELS/exam booking. (Civil Aviation Authority of Singapore (CAAS); book via CAPELS PID and the CAAS Examination Portal)

SAR-66 Module 9 Exam Content Outline

General (9.1)

Why human factors must be considered in aircraft maintenance, incidents linked to human error, and Murphy's Law as a design and inspection rationale

14%

Human Performance and Limitations (9.2)

Vision and hearing limits, information processing, attention and perception, memory stores, and constraints from claustrophobia and physical access

Social Psychology (9.3)

Individual and group responsibility, motivation and demotivation, peer pressure, culture issues, team working, and management, supervision and leadership

14%

Factors Affecting Performance (9.4)

Fitness and health, domestic and work stress, time pressure, overload and underload, sleep, fatigue and shiftwork, and alcohol, medication and drug abuse

Physical Environment (9.5)

Noise and fumes, illumination, climate and temperature, motion and vibration, and the overall working environment

Tasks (9.6)

Physical work demands, repetitive tasks, visual inspection vigilance, and working with complex systems

12%

Communication (9.7)

Communication within and between teams, work logging and recording, keeping currency, and disseminating information

16%

Human Error (9.8)

Error models and theories, types of error in maintenance tasks, accident implications, and methods of avoiding and managing errors

12%

Hazards in the Workplace (9.9)

Recognising and avoiding workplace hazards and dealing with emergencies

How to Pass the SAR-66 Module 9 Exam

What You Need to Know

Passing score: 75%
Exam length: 20 questions
Time limit: 25 minutes
Exam fee: S$87.20 per basic knowledge examination subject (Air Navigation Order Twelfth Schedule, rate from 1 January 2026; previously S$80). Confirm on CAPELS/exam booking.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

SAR-66 Module 9 Study Tips from Top Performers

1Memorise Murphy's Law and why error-tolerant design and independent inspection matter in maintenance

2Know the Dirty Dozen precursors and at least one practical safety net for each

3Classify unsafe acts accurately: slip, lapse, mistake and violation

4Be able to sketch Reason's Swiss Cheese (active failures vs latent conditions) and the SHELL interfaces

5Learn key human-performance figures taught in Module 9: short-term memory about 7±2 items, circadian low in the early morning hours, and noise-induced hearing loss peaking around 4 kHz

6Remember CAAS logistics: 20 MCQs, 25 minutes, 75% pass, M09/M50 Human Factors validity 5 years, and book via CAPELS/CAAS Examination Portal

Frequently Asked Questions

How many questions are on the CAAS SAR-66 Module 9 MCQ and how long is it?

Per CAAS AC 66-13 (Rev 1), Module M09 Human Factors has 20 multiple-choice questions with 25 minutes allowed for categories A, B1 and B2.

What is the pass mark for Module 9?

SAR-66 Appendix 2 sets the pass mark for each module at 75%. Penalty marking is not applied on multiple-choice papers.

Is there still an essay for Human Factors under SAR-66?

Yes. Unlike current EASA rules, Singapore SAR-66 still uses a combined M50 essay paper with questions from Modules 07, 09 and 10 (four essay questions in 120 minutes). This practice bank covers only the Module 9 MCQ syllabus.

How long does a Module 9 pass remain valid?

Under SAR-66, a pass in the Human Factors (M09) MCQ paper and a pass in the M50 essay examination paper are each valid for 5 years for licence application purposes (most other module passes are valid for 10 years).

What does the official MCQ format look like?

SAR-66 Appendix 2 states each multiple-choice question has three answers of which only one is correct, with a nominal average of about 75 seconds per question. This free bank uses four options to make practice harder.

What is the examination fee?

The Air Navigation Order Twelfth Schedule fee for each subject of a basic knowledge examination is S$87.20 from 1 January 2026 (updated from S$80). Confirm the live fee when booking on the CAAS Examination Portal.

What syllabus does Module 9 follow?

AC 66-13 Module 9 sections 9.1 to 9.9: General; Human Performance and Limitations; Social Psychology; Factors Affecting Performance; Physical Environment; Tasks; Communication; Human Error; and Hazards in the Workplace.