1.1 Current Exam Facts

1.1 Current Exam Facts

Quick Answer: For Category B1 and Category B2, Module 3 is 52 multiple-choice questions (MCQs) in 65 minutes. For Category A, it is 20 MCQs in 25 minutes. You need 75% to pass, there is no penalty marking, the official paper uses three options per question, and a Module 3 pass is valid for 10 years under SAR-66.25. Book via CAPELS / the CAAS Examination Portal; the exam is closed book.

Module 3 — Electrical Fundamentals is one of the SAR-66 basic knowledge modules administered under the Civil Aviation Authority of Singapore (CAAS). If you are building toward an aircraft maintenance licence in Categories A, B1, or B2, you must demonstrate competence in this module. Getting the logistics right before you open a textbook saves wasted sittings, wrong category assumptions, and last-minute booking errors.

Why These Facts Matter on Exam Day

Aircraft maintenance licensing is regulated. CAAS publishes the module configuration, pass standard, and administrative rules so that every candidate sits under the same conditions. Treating Module 3 like a school quiz—or like a European Part-66 paper you once sat elsewhere—creates avoidable risk. Singapore’s implementation is documented in AC 66-13 (Rev 1) for basic examination configuration and syllabus depth, and in SAR-66 Issue 2 Amendment 6 for licence structure, module applicability, and knowledge validity. Fee amounts live in the Air Navigation Order (ANO) Twelfth Schedule, not in the syllabus circular.

In the hangar, electrical fundamentals sit under almost every troubleshooting conversation: 28 V DC aircraft buses, 115 V 400 Hz AC generation, bonding, capacitance, and motor behaviour. The licence exam is your formal proof that you can apply that language safely. The facts below are the administrative frame around that technical proof.

Official Configuration by Licence Category

AC 66-13 (Rev 1) configures Module M03 Electrical Fundamentals as follows:

Notice that B1 and B2 share the same Module 3 paper size and duration. Category A is a shorter paper. When you register, confirm the category you are sitting for—do not assume a B1 timetable if you booked Category A.

Pass Mark and Marking Rules

• Pass mark: 75% of the questions answered correctly.
• Penalty marking: None. Wrong answers do not subtract marks. Unanswered questions simply earn zero for that item. On a three-option paper with no negative marking, a blank is never better than an educated guess after you have eliminated an option.
• Question type for Module 3: MCQ only. Module 3 does not include an essay. Essay requirements under the M50 framework apply to selected modules such as Module 07 (Maintenance Practices), Module 09 (Human Factors), and Module 10 (Aviation Legislation)—not to Electrical Fundamentals.

What “75%” Means in Practice

For a Category B1/B2 paper of 52 questions, 75% means you need at least 39 correct answers (because 0.75 × 52 = 39). For a Category A paper of 20 questions, 75% means at least 15 correct. Pace yourself: B1/B2 candidates have roughly 75 seconds per question; Category A candidates have about 75 seconds as well. That is enough time for a clean Ohm’s-law calculation if your method is automatic—and not enough if you are deriving formulae from first principles under pressure.

Official MCQ Format: Three Options

CAAS official Module 3 MCQs present three answer choices. That is a deliberate design difference from many commercial practice banks (including four-option banks you may use for training). On the real paper:

1. Read the stem carefully—especially units (ohms, volts, amperes, farads, henries).
2. Eliminate any option that violates a fundamental law (for example, power increasing when both voltage and current fall in a passive resistor).
3. Choose between the remaining options using calculation or definition, not “feel.”

Because there is no penalty marking, never leave a question blank once time is nearly up.

Validity of a Module 3 Pass

Under SAR-66.25, a passed basic knowledge examination remains valid for 10 years. If you pass Module 3 today and complete the rest of your licence path within that window, the Module 3 credit continues to count. If you let the ten-year clock expire without completing the licence requirements that rely on that pass, you should expect to re-sit. Plan your module sequence with that clock in mind—especially if you are spacing Category A experience and later Category B upgrades.

Fees and Booking (Singapore-Specific)

From 1 January 2026, the fee for each basic knowledge subject is S$87.20, as set out in the ANO Twelfth Schedule. Confirm the live amount on the CAAS fee schedule before you pay, because statutory schedules can be amended.

Booking route:

1. Create / use your account in CAPELS (CAAS personnel licensing electronic services) or the CAAS Examination Portal, as directed on the current CAAS personnel-licensing pages.
2. Select the Module 3 (Electrical Fundamentals) sitting for your licence category.
3. Pay the scheduled fee and retain confirmation.
4. Arrive ready for a closed-book examination—no notes, formula sheets, or personal electronic references unless CAAS explicitly authorises a specific aid for that sitting.

Treat the portal instructions as controlling on exam day. This study guide summarises published logistics; the booking confirmation and invigilator briefings govern what you may bring into the room.

Who Must Take Module 3?

Module 3 is a required basic knowledge module for SAR-66 Categories A, B1, and B2. Knowledge-level depth differs by category (Level 1 versus Level 2), which Section 1.2 covers in detail. Applicability does not: if your target licence includes Category A, B1, or B2 privileges under SAR-66, Electrical Fundamentals sits on your path.

Exam-Day Scenarios Candidates Misjudge

Scenario 1 — Wrong paper size. A Category A candidate who prepared only for a 52-question B1 paper may over-train on rare edge cases and under-train on time management for a short paper. Match practice volume and timed mocks to your category.

Scenario 2 — Confusing essay rules. A candidate who spent weeks drafting essay outlines for “electrical safety culture” has prepared for the wrong assessment type. Module 3 rewards precise MCQ calculation and definition, not long-form writing.

Scenario 3 — Ignoring validity. Passing Module 3 and then pausing licence work for eleven years wastes the credit. Diary the 10-year SAR-66.25 window when you receive your result.

Scenario 4 — Assuming four official options. Practising only four-option banks without adapting to three-option official stems can create false confidence about distractor patterns. Use four-option practice for depth, then finish with three-option timing drills when available.

Official Sources to Bookmark

Keep these as your primary references when logistics change:

• CAAS Advisory Circular AC 66-13 (Rev 1) — SAR-66 basic examinations (question counts, times, syllabus/knowledge levels for Module 3).
• SAR-66 Issue 2 Amendment 6 — licence structure, module applicability, and SAR-66.25 knowledge validity.
• CAAS personnel licensing pages on caas.gov.sg — booking, CAPELS/examination portal guidance, and fee pointers to the ANO Twelfth Schedule.

When this study guide and an official circular disagree, follow CAAS.