1.2 How to Study for the AMG Exam

1.2 How to Study for the AMG Exam

Passing the FAA Aviation Mechanic General (AMG) knowledge test demands a structured, engineering-grade study approach. The AMG examination is not a test of rote memorization; it evaluates your capacity to interpret technical data, execute precise physical and electrical calculations, apply federal maintenance regulations to real-world scenarios, and identify critical safety hazards.

This section outlines the official Airman Certification Standards (ACS) architecture, analyzes the subject area weightings, identifies authoritative FAA publications, and delivers a battle-tested study framework designed to guarantee a first-time pass with an exceptional score.

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The Airman Certification Standards (ACS) Architecture

The FAA has transitioned mechanic certification to the Airman Certification Standards (FAA-S-ACS-1), replacing the legacy Practical Test Standards (PTS). The ACS aligns knowledge, risk management, and skill elements across the written, oral, and practical examinations into an integrated, transparent testing framework.

+-------------------------------------------------------------------------+
|                  FAA-S-ACS-1 ELEMENT CODING SYSTEM                      |
+-------------------------------------------------------------------------+
|                                                                         |
|   Example ACS Code:  AM . I . A . K1                                    |
|                      --   -   -   --                                    |
|                       |   |   |   |                                     |
|   Certificate --------+   |   |   +--- Element type & number            |
|   (AM = Aviation          |   |        (K = Knowledge, R = Risk Mgmt,   |
|    Mechanic)              |   |         S = Skill)                      |
|                           |   |                                         |
|   Section ----------------+   +------- Subject letter                   |
|   (I = General,                       (A = Fundamentals of Electricity  |
|    II = Airframe,                          and Electronics)             |
|    III = Powerplant)                                                    |
|                                                                         |
|   NOTE: the prefix is AM, not AMG. There is no "AMG.I.A.K1" code.       |
|   AMG is the TEST CODE printed on your AKTR; AM.I.A.K1 is the ACS       |
|   ELEMENT CODE used to report which subject you missed.                 |
|                                                                         |
+-------------------------------------------------------------------------+

The Three ACS Pillars

1. Knowledge (K): Theoretical concepts, mathematical formulas, physical principles, and regulatory definitions tested primarily on the written exam and probed during the oral examination.
2. Risk Management (R): Identification of human factors, operational hazards, environmental risks, and safety precautions associated with maintenance tasks.
3. Skill (S): Practical hands-on competencies executed under the direct observation of the DME (e.g., fabricating rigid tubing, taking micrometer measurements, performing a dye-penetrant inspection).

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The 12 Official General ACS Subjects (and Why There Are No Published Weights)

Section I (General) of FAA-S-ACS-1 contains twelve subjects, lettered A through L — not ten. Two of them, Inspection Concepts and Techniques (K) and Human Factors (L), are routinely omitted from third-party study material because they did not exist as separate blocks in the retired Part 147 appendices. They are in the ACS now, the ACS is incorporated by reference at 14 CFR § 65.23, and they are fair game.

Read this before you trust any "AMG exam weights" table. The FAA does not publish subject-area percentages or per-subject question counts for the AMG test. FAA-S-ACS-1 contains no percentages at all, and the FAA Airman Knowledge Testing Matrix publishes only the totals (60 questions, 2.0 hours, 70% to pass). Any site showing "Regulations 24%, Electricity 15%…" invented those numbers. What the FAA does publish is the element inventory below — the count of Knowledge (K) elements written for each subject. Use it as a rough proxy for breadth, and treat it as exactly that: a proxy, not a weighting.

+-------------------------------------------------------------------------+
|        FAA-S-ACS-1 SECTION I: KNOWLEDGE ELEMENTS PER SUBJECT             |
|        (element counts from the ACS -- NOT FAA exam weights)             |
+-------------------------------------------------------------------------+
|  A  Electricity & Electronics      27  ###########################       |
|  G  Cleaning & Corrosion Control   24  ########################          |
|  I  Regulations, Forms & Records   23  #######################           |
|  F  Ground Operations & Servicing  16  ################                  |
|  E  Materials, Hardware, Processes 14  ##############                    |
|  H  Mathematics                    13  #############                     |
|  J  Physics for Aviation           13  #############                     |
|  L  Human Factors                  11  ###########                       |
|  C  Weight and Balance             10  ##########                        |
|  D  Fluid Lines and Fittings        6  ######                            |
|  K  Inspection Concepts             5  #####                             |
|  B  Aircraft Drawings               4  ####                              |
+-------------------------------------------------------------------------+

What this means for your study plan

Because the FAA never publishes the distribution, the only defensible strategy is blueprint completeness: every one of the 166 knowledge elements is a legal candidate for a question, and a 60-question sample drawn from 166 elements works out to roughly one question for every three elements. You cannot afford a blank subject. In particular:

• Do not skip Subjects K and L. Together they hold 16 knowledge elements — more than Weight and Balance — and most commercial question banks under-serve them badly.
• Small subjects are not low-risk. Aircraft Drawings carries only four knowledge elements, but each one is broad ("commonly used lines, symbols, and terminology" covers an entire line-convention chart), so per-element depth is high.
• Weight your time by your own diagnostic score, not by an invented percentage table. Take a full 60-question timed test, map every miss to an ACS code, and spend your hours where those codes cluster. That is exactly what the Designated Mechanic Examiner will do with your Airman Knowledge Test Report during the oral.

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Essential FAA Handbooks & Authoritative References

Every question on the AMG exam is referenced directly to an official FAA publication. Relying exclusively on third-party question banks without reading the source material leaves dangerous knowledge gaps that will be exposed during the DME oral examination.

+-------------------------------------------------------------------------+
|                     OFFICIAL FAA STUDY REPOSITORY                       |
+-------------------------------------------------------------------------+
| Publication Code    | Title & Core Focus                                |
+---------------------+---------------------------------------------------+
| FAA-H-8083-30B      | Aviation Maintenance Technician Handbook—General  |
| (Volumes 1 & 2)     | • Primary text for the 12 General ACS subjects   |
|                     | • Downloadable free from FAA.gov                  |
+---------------------+---------------------------------------------------+
| AC 43.13-1B         | Acceptable Methods, Techniques, and Practices—    |
| (Change 1)          | Aircraft Inspection and Repair                    |
|                     | • The industry standard "bible" for hardware,     |
|                     |   rivet layout, control cables, torque, & NDT     |
+---------------------+---------------------------------------------------+
| AC 43.13-2B         | Acceptable Methods, Techniques, and Practices—    |
|                     | Aircraft Alterations                              |
|                     | • Structural antenna installations & cargo mods   |
+---------------------+---------------------------------------------------+
| 14 CFR Part 43      | Maintenance, Preventive Maintenance, Rebuilding,  |
|                     | and Alteration                                    |
|                     | • Major vs. minor repair definitions (App. A)     |
|                     | • Form 337 execution and logbook signoffs         |
+---------------------+---------------------------------------------------+
| 14 CFR Part 65      | Certification: Airmen Other Than Flight Crew      |
|                     | • Subpart D: Mechanic eligibility and privileges  |
|                     | • § 65.19 retesting; § 65.21 change of address    |
|                     | • § 65.23 incorporates FAA-S-ACS-1 by reference   |
+---------------------+---------------------------------------------------+
| FAA-S-ACS-1         | Aviation Mechanic General, Airframe, and          |
| (Nov 1, 2021)       | Powerplant Airman Certification Standards         |
|                     | • THE blueprint: 12 General subjects and 166      |
|                     |   knowledge elements; free PDF on faa.gov         |
+---------------------+---------------------------------------------------+
| FAA-CT-8080-4G      | Airman Knowledge Testing Supplement for Aviation  |
| (2018)              | Maintenance Technician — General, Airframe, and   |
|                     | Powerplant; and Parachute Rigger                  |
|                     | • Complete book of official exam figures & charts |
+-------------------------------------------------------------------------+

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The 4-Phase High-Yield Study Roadmap

To achieve comprehensive mastery, structure your preparation across four distinct sequential phases over an 8-to-12 week timeframe.

+-------------------------------------------------------------------------+
|                     THE 4-PHASE STUDY ARCHITECTURE                      |
+-------------------------------------------------------------------------+
|                                                                         |
|   PHASE 1: Core Foundation & Regulatory Framework (Weeks 1–3)           |
|   • Master 14 CFR Parts 1, 21, 39, 43, 65, and 91                       |
|   • Deep read of FAA-H-8083-30B Volume 1 (Chapters 1–6)                 |
|   • Create flashcards for Form 337, ADs, TCDS, and logbook entries      |
|                                                                         |
|   PHASE 2: Active Calculation & Engineering Principles (Weeks 4–6)      |
|   • Solve 100+ Ohm's Law, Kirchhoff's, and power equations              |
|   • Master Weight & Balance (Datum, Arm, Moment, Adverse CG, Ballast)   |
|   • Work physics problems (Gas laws, mechanical advantage, hydraulics)  |
|                                                                         |
|   PHASE 3: Hardware, Materials, & Visual Recognition (Weeks 7–8)        |
|   • AN/MS bolt head markings, grip lengths, and thread pitch            |
|   • Tubing sizing (16ths OD) vs. Hose sizing (16ths ID)                 |
|   • Schematic symbols, orthographic projections, and NDT methods        |
|                                                                         |
|   PHASE 4: Timed Mock Testing & ACS Remediation (Weeks 9–10)            |
|   • Complete 5+ full-length 60-question timed practice exams (120 min)  |
|   • Target 90%+ consistent scoring across all sections                  |
|   • Remediate missed questions by logging specific ACS codes            |
|                                                                         |
+-------------------------------------------------------------------------+

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Active Calculation Mastery: Step-by-Step Problem Solving

The AMG test is calculation-heavy relative to most FAA knowledge tests: Mathematics (AM.I.H), Weight and Balance (AM.I.C), Physics (AM.I.J) and Electricity (AM.I.A) together hold 63 of the 166 Section I knowledge elements, and many are explicitly computational. The FAA does not publish how many of the 60 items are numerical, so do not budget your preparation against a percentage you read somewhere — budget it against your own ability to set up and solve these formulas without hesitation.

Worked Example 1: DC Series-Parallel Circuit Analysis

Problem: In the circuit below, a 28-volt DC bus powers a series resistor $R_1 = 4,\Omega$ connected in series with a parallel combination of $R_2 = 12,\Omega$ and $R_3 = 6,\Omega$. Determine:

1. Total circuit equivalent resistance ($R_T$)
2. Total circuit current ($I_T$)
3. Voltage drop across the parallel network ($V_{\text{parallel}}$)
4. Current flowing through the $6,\Omega$ branch ($I_3$)

          +--------- R1 = 4 Ω ---------+----------+ 
          |                            |          | 
   +---[ + ]                          [ R2 ]     [ R3 ] 
 28V DC                               12 Ω        6 Ω 
   +---[ - ]                           |          | 
          |                            |          | 
          +----------------------------+----------+ 

Step-by-Step Solution:

1. Calculate the equivalent resistance of the parallel combination ($R_p$): $R_p = \frac{R_2 \cdot R_3}{R_2 + R_3} = \frac{12 \cdot 6}{12 + 6} = \frac{72}{18} = 4\,\Omega$
2. Calculate total circuit equivalent resistance ($R_T$): $R_T = R_1 + R_p = 4\,\Omega + 4\,\Omega = 8\,\Omega$
3. Calculate total circuit current ($I_T$) using Ohm's Law: $I_T = \frac{E}{R_T} = \frac{28\text{ V}}{8\,\Omega} = 3.5\text{ Amperes}$
4. Calculate the voltage drop across series resistor $R_1$ ($V_1$): $V_1 = I_T \cdot R_1 = 3.5\text{ A} \cdot 4\,\Omega = 14\text{ Volts}$
5. Calculate voltage available across parallel network ($V_p$): $V_p = E_{\text{source}} - V_1 = 28\text{ V} - 14\text{ V} = 14\text{ Volts}$
6. Calculate current flowing through the $6,\Omega$ branch ($I_3$): $I_3 = \frac{V_p}{R_3} = \frac{14\text{ V}}{6\,\Omega} = 2.33\text{ Amperes}$

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Worked Example 2: Empty Weight and Center of Gravity (EWCG)

Problem: An aircraft is placed on three scales for weighing. The datum is located at the nose tip. Determine the Empty Weight Center of Gravity (EWCG) given the following data:

• Left Main Gear Scale: 820 lbs (Tare weight: 10 lbs chocks)
• Right Main Gear Scale: 815 lbs (Tare weight: 10 lbs chocks)
• Nose Gear Scale: 385 lbs (Tare weight: 5 lbs chocks)
• Distance from Datum to Main Gear Centerline ($A_{\text{main}}$): +85 inches
• Distance from Datum to Nose Gear Centerline ($A_{\text{nose}}$): +25 inches

+-------------------------------------------------------------------------+
|                   WEIGHT & BALANCE CALCULATION TABLE                    |
+-------------------------------------------------------------------------+
| Scale Location | Scale (lbs) | Tare (lbs) | Net Wt (lbs) | Arm (in) | Moment (lb-in) |
+----------------+-------------+------------+--------------+----------+----------------+
| Left Main      |     820     |     10     |     810      |   +85    |    +68,850     |
| Right Main     |     815     |     10     |     805      |   +85    |    +68,425     |
| Nose Gear      |     385     |      5     |     380      |   +25    |     +9,500     |
+----------------+-------------+------------+--------------+----------+----------------+
| TOTALS         |             |            |    1,995     |          |   +146,775     |
+-------------------------------------------------------------------------+

Calculation: $\text{EWCG} = \frac{\text{Total Moment}}{\text{Total Net Weight}} = \frac{146,775\text{ lb-in}}{1,995\text{ lbs}} = +73.57\text{ inches aft of datum}$

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Worked Example 3: Gas Law Applied to Hydraulic Accumulators

Problem: A pneumatic hydraulic accumulator has an internal nitrogen pre-charge volume of $120\text{ in}^3$ at a pre-charge pressure of $600\text{ psig}$ at $70^\circ\text{F}$. When hydraulic system pressure reaches $3,000\text{ psig}$ at constant temperature, what is the compressed nitrogen volume ($V_2$)?

Formula (Boyle's Law at constant temperature): $P_1 \cdot V_1 = P_2 \cdot V_2 \implies V_2 = \frac{P_1 \cdot V_1}{P_2}$

Note: Always convert gauge pressure (psig) to absolute pressure (psia) by adding atmospheric pressure ($14.7\text{ psi}$):

• $P_1 = 600 + 14.7 = 614.7\text{ psia}$
• $P_2 = 3,000 + 14.7 = 3,014.7\text{ psia}$

$V_2 = \frac{614.7\text{ psia} \cdot 120\text{ in}^3}{3,014.7\text{ psia}} = \frac{73,764}{3,014.7} = 24.47\text{ in}^3$

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Exam-Day Pacing & Test-Taking Strategies

With 60 questions and 120 minutes, you have an average of 2 minutes per question. Implement the 3-Pass Strategy on testing day:

+-------------------------------------------------------------------------+
|                    THE 3-PASS EXAM EXECUTION STRATEGY                   |
+-------------------------------------------------------------------------+
|                                                                         |
|   PASS 1: Rapid Recall & Direct Concepts (Minutes 0–40)                 |
|   • Answer all direct factual, regulatory, and definition questions    |
|   • Instantly identify answers you know with 100% confidence           |
|   • Flag all calculation, diagram, and complex schematic questions     |
|   • Target: 30–35 questions completed; bank remaining time             |
|                                                                         |
|   PASS 2: Calculations, Schematics, & Supplement Lookup (Minutes 40–85) |
|   • Solve flagged calculation problems step-by-step on scratch paper   |
|   • Open FAA-CT-8080-4G supplement figures and verify figure labels  |
|   • Double-check decimal points, units (amps vs. milliamps, in vs. ft) |
|   • Target: Complete remaining 25–30 questions                          |
|                                                                         |
|   PASS 3: Review Flagged Items & Sanity Check (Minutes 85–105)          |
|   • Revisit difficult questions; employ systematic distractor elimination|
|   • Ensure NO questions are left unanswered (no guessing penalty)      |
|   • Verify scratchpad numbers match selected computer choices          |
|                                                                         |
|   FINAL BUFFER (Minutes 105–120)                                        |
|   • Final submission review; breathe and confirm score                  |
+-------------------------------------------------------------------------+

Distractor Deconstruction & Elimination Rules

1. Metric vs. Imperial Units: Watch out for questions giving dimensions in millimeters when the formula expects inches, or grams vs. pounds.
2. Gauge vs. Absolute Pressure: In pneumatic calculations, distractors frequently use psig without adding 14.7 psi.
3. 14 CFR Part Confusion: Distractors commonly swap Part 43 (Maintenance/Alterations) with Part 91 (General Operating Rules) or Part 65 (Certification).
4. Inverted Formulas: In electrical circuits, distractors invert parallel resistance formulas ($R_T = R_1 + R_2$ instead of reciprocal addition).