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The free sample gives you about two exams' worth of questions per knowledge area. The full bank covers every ACS knowledge area in depth, with source-cited explanations. $49, one time, lifetime access on up to 3 devices — all three tests (General, Airframe, Powerplant) included.
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The real Aviation Mechanic - General written test has 60 multiple-choice questions (3 options each), a 2-hour time limit, and requires 70% to pass. Questions are drawn across 12 knowledge areas per the FAA-S-ACS-1 blueprint; this bank mirrors those areas and weights.
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The live test bank is not published. Our questions include the FAA's own published sample questions plus original questions written to the ACS blueprint and grounded in the FAA handbooks (FAA-H-8083-30B/31B/32B) and 14 CFR, with the source cited in each explanation.
The full Aviation Mechanic - General bank contains 375 questions with explanations. The free sample gives you roughly two exams' worth per knowledge area.
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A selection of free questions with answers and explanations. Use the interactive modules above for timed, scored drills.
What is the value of the square root of 64 plus 4 squared?
Why: Square root of 64 is 8; 4 squared is 16; 8 + 16 = 24. FAA-H-8083-30B ch.3 (powers and roots).
Flareless (MS) fittings differ from AN flare fittings in that flareless fittings
Why: MS flareless fittings use a presetting sleeve that bites into the tube - no flare is formed on the tube end. FAA-H-8083-30B ch.9.
An aircraft burns 105 gallons of fuel during a 3.5-hour flight. What is the average fuel consumption?
Why: 105 gallons / 3.5 hours = 30 gallons per hour. FAA-H-8083-30B ch.3 (division).
A sheet metal repair requires 12 rivets for each of 14 wing ribs, plus 25 additional rivets for the doubler. How many rivets are required in total?
Why: 12 rivets x 14 ribs = 168, plus 25 for the doubler = 193 rivets. FAA-H-8083-30B ch.3 (multiplication and addition of whole numbers).
14 CFR part 65 contains regulations regarding the certification of
Why: 14 CFR part 65 contains the certification regulations for airmen other than flight crewmembers. 14 CFR part 65.
How many personnel are required to service an aircraft with gaseous oxygen?
Why: Two personnel are required to service an aircraft with gaseous oxygen: one at the control valves and one observing the pressure in the aircraft system, with communication between them. FAA-H-8083-30B ch.1.
Approximately what percentage of maintenance-related errors is estimated to be caused by distractions?
Why: It is estimated that 15 percent of maintenance-related errors are caused by distractions; a good practice is to go back three steps in the procedure when work resumes after a distraction. FAA-H-8083-30B ch.14.
Magnetic particle inspection can be used on which materials, and what must be done after the test?
Why: Magnetic particle inspection works on ferromagnetic materials only, detects surface and subsurface discontinuities, and the part must be demagnetized after the test. FAA-H-8083-30B ch.10.
A supplemental type certificate (STC) is issued when
Why: An STC approves a major modification of the type design; TCDSs and STCs are available through FAA databases and must be consulted for modified aircraft.
What type of drawing line consists of alternating long and short lines?
Why: A center line consists of alternating long and short dashes. FAA-H-8083-30B ch.4.
What is the MEDA process, and who developed it?
Why: MEDA (Maintenance Error Decision Aid) was developed by Boeing; its goal is to investigate errors, understand root causes, and prevent accidents, instead of placing blame on the maintenance personnel. FAA-H-8083-30B ch.14.
Fretting corrosion between two mating surfaces is also known by what name, and is identified on a rivet how?
Why: Fretting corrosion occurs when mating surfaces at rest undergo slight relative motion; it has been called false brinelling, and the common example is the smoking rivet, identified by a black ring around the rivet. FAA-H-8083-30B ch.8.
When an aircraft is sold domestically, the Airworthiness Certificate
Why: When an aircraft is sold domestically, the Airworthiness Certificate is transferred with the aircraft at the time of sale. FAA-H-8083-30B ch.2.
When calculating the new weight and balance for an aircraft, what is used to determine the operating CG range?
Why: The operating CG range used in weight-and-balance calculations is obtained from the Type Certificate Data Sheets. FAA-H-8083-30B ch.6.
According to Faraday's law, the voltage induced in a coil is proportional to
Why: Faraday's law: induced emf depends on the rate of change of flux linking the coil - the basis of generator action. FAA-H-8083-30B ch.12.
What is the standard position for an aircraft taxi signalman relative to the aircraft?
Why: The standard position for a signalman is slightly ahead of and in line with the aircraft's left wingtip, staying far enough ahead to remain in the pilot's field of vision. FAA-H-8083-30B ch.1.
What type of line is normally used in a drawing or blueprint that indicates invisible edges or contours?
Why: Invisible (hidden) edges or contours are shown with a medium-weight line of short dashes evenly spaced. FAA-H-8083-30B ch.4.
If a part to be inspected for surface defects is made of a magnetic material, which inspection method is generally recommended?
Why: If the part in question is made of a magnetic material, magnetic particle inspection is generally recommended over penetrant inspection. FAA-H-8083-30B ch.10.
Charles' law states that a gas expands and contracts in what relationship to absolute temperature, provided pressure is constant?
Why: Charles' law: all gases expand and contract in direct proportion to the change in absolute temperature, provided pressure is held constant (V1T2 = V2T1). FAA-H-8083-30B ch.5.
The purpose of a voltage regulator in an aircraft generator system is to
Why: The regulator adjusts field current so output voltage stays constant despite changing engine speed and electrical load. FAA-H-8083-30B ch.12.
Examples of units used in the conventional (U.S. or English) measurement include
Why: Conventional (U.S./English) measurement units include the inch, ounce, and pound. FAA-H-8083-30B ch.3.
What is the correct grounding/bonding sequence when fueling an aircraft from a fuel truck?
Why: Ground the aircraft and then ground the truck; next, ground or bond them together by running a connecting wire between the aircraft and the fuel truck. FAA-H-8083-30B ch.1.
In a sectional view drawing, what sections illustrate particular parts of an object?
Why: Removed sections illustrate particular parts of an object, drawn outside the main view. FAA-H-8083-30B ch.4.
The 'Environment' element of the PEAR model addresses which two environments in aviation maintenance?
Why: A human factors program must address at least two environments: the physical workplace (ramp, hangar, shop) and the organizational environment that exists within the company. FAA-H-8083-30B ch.14.
A handle-length extension (cheater bar) must never be used on
Why: The handbook cautions against handle extensions on flexible beam-type wrenches; on other types a handle extension alone does not change the reading. FAA-H-8083-30B ch.7.
When installing a flexible hose assembly, the hose should be
Why: Hose shortens under pressure, so 5-8% slack is required; hose must never be installed twisted or taut. FAA-H-8083-30B ch.9.
The capacity of an aircraft storage battery is rated in
Why: Battery capacity - how much current it can deliver for how long - is expressed in ampere-hours. FAA-H-8083-30B ch.12.
Which of the following tools is best to use when cutting soft aluminum tubing?
Why: A hand-operated wheel-type tubing cutter is best for cutting soft aluminum tubing. FAA-H-8083-30B ch.9.
From the control tower, a flashing green light signal directed at a taxiing aircraft means what?
Why: Standard taxi light signals: flashing green means cleared to taxi. FAA-H-8083-30B ch.1 (Figure 1-22).
Alclad aluminum sheet is aluminum alloy
Why: Alclad carries pure-aluminum surface layers whose natural oxide protects the stronger but less corrosion-resistant alloy core. FAA-H-8083-30B ch.7.