Math
A blueprint shows a hole of 0.17187 to be drilled. Which fraction size drill bit is most nearly equal?
A. 11/64
B. 11/32
C. 9/32
A. 11/64 (11/64 is equal to 0.171875. )
What does a hydrometer measure in a lead-acid battery?
A. Current flow
B. Specific gravity of electrolyte
C. Voltage output
B. Specific gravity of electrolyte
Which inspection method for deep flaws shows internal flaws without damaging the part?
A. Tap test
B. Magnetic particle inspection
C. Film radiography
C. Film radiography
Film radiography allows internal inspection through X-rays without harming the part. It is ideal for checking inside castings, welds, or sealed components.
What is the most effective ballast placement?
A. At the aircraft’s CG
B. Next to the pilot seat
C. As far from the datum as possible
C. As far from the datum as possible
Placing ballast as far from the datum as possible is most effective. This maximizes the moment arm, allowing the smallest weight to achieve the needed CG correction.
What is the decimal (base 10) equivalent of the binary number 1011?
A. 9
B. 10
C. 11
C. 11
Solve the equation. (64 x 3/8) ÷ 3/4 =
A. 18
B. 32
C. 24
B. 32
What is absolute humidity?
A. The actual amount of the water vapor in a mixture of air and water
B. The ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure
C. The temperature to which humid air must be cooled at constant pressure to become saturated
A. The actual amount of the water vapor in a mixture of air and water
What tool is used to measure the internal diameter of a small bore?
A. Radius gauge
B. Small hole gauge
C. Dial indicator
B. Small hole gauge
Small hole gauges expand within a bore and can then be measured with a micrometer. They are specifically designed for small internal diameter checks.
What formula is used to calculate the moment of an object in weight and balance calculations?
A. Moment = Weight × Arm
B. Moment = Weight ÷ Arm
C. Moment = Arm ÷ Weight
A. Moment = Weight × Arm
A six-cylinder engine with a bore of 3.5 inches, a cylinder height of 7 inches and a stroke of 4.5 inches will have a total piston displacement of
A. 256.88 cubic inches
B. 43.3 cubic inches
C. 259.77 cubic inches
C. 259.77 cubic inches
A rectangular-shaped fuel tank measures 37-1/2 inches in length, 14 inches in width, and 8-1/4 inches in depth. How many cubic inches are within the tank?
A. 525
B. 4,331.25
C. 4,33.125
B. 4,331.25
What happens to the volume of gas if pressure is reduced and temperature is held constant?
A. Volume decreases
B. Volume increases
C. Volume stays the same
B. Volume increases.
Boyle’s Law: volume increases when pressure decreases at constant temperature.
An aircraft receives its annual inspection on January 12, 2025. When is the last valid day for this inspection?
A. December 31, 2025
B. January 12, 2026
C. January 31, 2026
C. January 31, 2026
Per 14 CFR § 91.409(a), an annual inspection is valid for 12 calendar months. That means if the inspection is completed on any day in January 2025 (e.g., January 12), it is valid until the last day of January 2026 — January 31, 2026 — regardless of the specific inspection day.
What will be the weight condition of an aircraft, if all seats are occupied, full baggage weight is carried, and all fuel tanks are full?
A. It will be at maximum basic operating weight (BOW)
B. It will be at maximum landing weight
C. It will be in excess of maximum takeoff weight
C. It will be in excess of maximum takeoff weight
Most modern aircraft are designed so that if all seats are occupied, full baggage weight is carried, and all fuel tanks are full, the aircraft will be grossly overloaded. It will be in excess of maximum takeoff weight.
A pilot pulls the nose up steeply during climb. The aircraft begins to buffet and lose lift. What is most likely happening?
A. The engine is producing too much thrust
B. Airflow is separating and causes a stall
C. The aircraft is entering a spin
B. Airflow separates and causes stall
Exceeding the critical angle of attack causes airflow to separate from the upper wing surface. This leads to buffering and a sudden loss of lift.
An airplane flying a distance of 875 miles used 70 gallons of gasoline. How many gallons will it need to travel 3,000 miles?
A. 250
B. 144
C. 240
C. 240
If the airplane uses 70 gallons of gasoline while flying 875 miles, it is geƫng 875 ÷ 70 or 12.5 miles per gallon of fuel burned. At this rate of fuel consumption, it will require 3,000 ÷ 12.5 = 240 gallons of fuel to fly 3,000 miles
Which axis does the elevator control during flight?
A. Vertical
B. Lateral
C. Longitudinal
B. Lateral
Elevators control pitch, which occurs around the lateral axis.
What tool should be used to measure the depth of a groove in an engine casing to ensure proper fitment of a seal?
A. Depth micrometer
B. Outside micrometer
C. Inside caliper
A. Depth micrometer
A depth micrometer is designed for precise measurement of depth in holes, slots, or grooves, making it ideal for this task.
What does Maximum Zero Fuel Weight (MZFW) exclude?
A. Passenger baggage
B. Hydraulic fluid
C. Usable fuel
C. Usable fuel
MZFW excludes usable fuel to prevent structural overload.
During a dye penetrant test, why must the excess penetrant be removed before applying developer?
A. It protects the part from corrosion
B. To allow accurate flaw indication
C. To soften the defect area
B. To allow accurate flaw indication.
If excess dye isn’t removed, it will obscure the flaw indications. Proper cleaning ensures only penetrant in the defect remains, which can then be drawn out by the developer
If a double-actuating actuating cylinder in a 3,000 psi system has a piston with a surface area of three square inches on the extension side, and a rod with a cross-section area of one square inch attached to the piston on the other side, approximately how much force will the actuator be able to produce when retracting?
A. 9,000 pounds
B. 6,000 pounds
C. 3,000 pounds
B. 6,000 pounds (2 sq. in. x 3,000 psi = 6,000)
If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume temperature remains constant):
A. Increase in direct proportion to the volume increase
B. Be reduced to one-half its original value
C. Remain the same
B. Be reduced to one-half its original value
The pressure of a gas in an enclosed container varies inversely as the volume of the container, if the absolute temperature of the gas remains constant. Doubling the volume of the container will decrease the pressure of the enclosed gas to a value of one-half its original pressure.
During a heavy maintenance check, you suspect there is a deep internal crack in a wing spar. Which inspection method should be used to confirm this?
A. Magnetic particle
B. Ultrasonic imaging
C. Eddy current testing
B. Ultrasonic imaging
Ultrasonic imaging uses sound waves to detect deep internal flaws, making it ideal for inspecting internal structures like wing spars.
The following alteration was performed on an aircraft: A model B engine weighing 275 pounds was replaced by a model D engine weighing 185 pounds at a -62.00-inch station. The aircraft weight and balance records show the previous empty weight to be 998 pounds and an empty weight CG of 13.48 inches. What is the new empty weight CG?
A. + 19.73
B. + 20.96
C. - 14.25
B. + 20.96
An aircraft as loaded weighs 4,954 pounds at a CG of +30.5 inches. The CG range is +32.0 inches to +42.1 inches. Find the minimum weight of the ballast necessary to bring the CG within the CG range. The ballast arm is +172 inches.
A. 57.16 pounds
B. 61.98 pounds
C. 53.08 pounds
C. 53.08 pounds