Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
100 Cards in this Set
- Front
- Back
Atmospheric pressure at sea level is |
14.7 pounds per square inch (psi). |
|
A barometer is designed to measure pressure in |
Inches of mercury. |
|
The primary force an airfoil has to defeat is |
Weight. |
|
The force that acts upward at a right angle to the direction of the relative wind is |
Lift. |
|
The force that acts parallel to the relative wind is |
Drag. |
|
The stress that resists the force tending to cause one layer of material to slide over an adjacent layer is called |
Shear. |
|
What is the design that uses any combination of longerons, stringers, bulkheads and frames in the construction of the fuselage called? |
Semi-monocoque. |
|
The structural members used to give shape to the aircraft and provide a means for attaching the skin to the structure are called |
Stringers. |
|
The most common type of material used for fuselage construction is |
Aluminum alloy. |
|
The wing design used on most modern military aircraft is |
Cantilever. |
|
The fixed vertical surface of the empennage is called the |
Fin. |
|
Engine mounts are typically made of corrosion-resistant steel that are able to withstand forces of |
180,000 to 200,000 psi. |
|
The main difference between inspection plates and panels is |
Size. |
|
A network of ultrafine cracks that form on or under the surface of transparent plastics is called |
Crazing. |
|
What are the reference locations in the vertical direction measured from a reference datum that is usually well below the aircraft called? |
Waterlines. |
|
Movement about the vertical axis is called |
Yaw. |
|
Which flight control surface is a longitudinal control surface? |
Elevator. |
|
Which of these is attached to the trailing edge of a horizontal stabilizer? |
Elevator. |
|
When making a right turn, the relative position of the ailerons is the right aileron trailing edge is |
Up, left aileron trailing edge is down. |
|
The purpose of wing flaps is to |
Increase lift and drag. |
|
The purpose of an aircraft trim systems is to |
Correct minor deviations in flight attitude. |
|
Matter is any substance that has mass and |
Occupies space. |
|
Atoms are made up of |
Protons, neutrons, and electrons. |
|
Electrons can be released from their outer orbit by all of the following forces except |
Cold. |
|
What is the electrical pressure that causes electrons to flow through the conductor called? |
Electromotive force. |
|
If you apply 24 volts through a total resistance of 6 ohms in a series circuit, the amperage would be |
4. |
|
A permanent magnet is produced from a material with |
High reluctance and low permeability. |
|
When soft iron is brought close to a permanent magnet it is |
Magnetized. |
|
The greater the current flow through an electromagnet, the |
Greater the strength. |
|
Current flow in most aircraft circuits is controlled by |
Switches. |
|
The majority of aircraft circuit protection devices are normally located |
In the aircraft cabin. |
|
What term describes current that reverses it's direction at regularly recurring intervals? |
Alternating. |
|
The methods used to cool brushless alternating current (AC) generators are |
Engine oil and blast air. |
|
The output of the constant speed drive (CSD) used to drive a 60/80 kilo volt ampere (KVA) generator is approximately |
8,000 RPM. |
|
The understeer switch (USS) on the 60/80 kilo volt ampere (KVA) generator constant speed drive (CSD) actuates at |
365 Hz. |
|
What supplies rotary power to the input gear of the constant speed drive (CSD)? |
Accessory gearbox. |
|
A battery's internal component that is a grid or framework which supports the active chemical materials is called the |
Plate. |
|
A 24-volt nickel-cadmium battery has |
19 cells. |
|
The nickel-cadmium battery can be fully charged only by |
Constant current. |
|
What type of motor can operate on alternating current (AC) or direct current (DC)? |
Universal. |
|
A shunt-type motor has |
Low starting torque and good speed regulation. |
|
The three states of matter are |
Liquids, gases, and solids. |
|
When any force causes a solid to change permanently, the solid is said to have |
Passed the elastic limit. |
|
The most outstanding characteristic of a liquid is its |
Ability to conform to the shape of its container. |
|
What usually produces flow in a pneudraulic system? |
Piston pushing the fluid. |
|
Who was among the first to study the compressibility of gases? |
Boyle. |
|
If 50 pounds per square inch (psi) of cylinder pressure acts on a 5-square-inch piston head, what will the resulting force be? |
250 pounds. |
|
When an 8-square-inch piston moves 5 inches within a cylinder, what volume of liquid is displaced? |
40 cubic inches. |
|
Turbulence affects fluid-flow in a hydraulic line by |
Creating resistance and loss of energy. |
|
A tube whose cross-section area is gradually reduced to a smaller size diameter is called a |
Venturi. |
|
The purposes of a hydraulic reservoir are to |
Replenish fluid, allow for thermal expansion, and provide a means of bleeding air from the system. |
|
The purpose of a standpipe in a reservoir is to |
Reserve fluid for the emergency pump. |
|
The amount of fluid a pump produces on each cycle or revolution is called its |
Displacement. |
|
When referring to hydraulic hand pumps, double-action means |
Fluid-flow is created with each stroke of the pump handle. |
|
Variable-volume pumps do not require a separate pressure-regulating device in the system because |
They have an integral compensator. |
|
What provides for cooler operation in a Stratopower variable-volume hydraulic pump? |
Creep plates. |
|
In the Stratopower variable-volume pump, what holds the pistons in contact with the cam plate? |
Nutating plate. |
|
The purpose of a hydraulic motor is to convert hydraulic pressure into |
Rotary mechanical motion. |
|
How is the piston installed in an accumulator? |
Hollow end toward the air side of the accumulator. |
|
The size of one micron is four |
Millionths of an inch. |
|
In a hydraulic system, the hydraulic manifold provides a location where the |
Common fluid lines can come together. |
|
The purpose of an actuating cylinder is to transform fluid pressure into |
A mechanical force. |
|
What pneudraulic system component uses a single - acting actuating cylinder? |
Brake assembly. |
|
What pneudraulic system component uses a double-acting balanced actuating cylinder? |
Nosewheel steering. |
|
Which actuator type slows down piston travel when the piston nears either end of the cylinder? |
Internal snubber. |
|
A manual poppet-type selector valve is in a working position when the camshaft is rotated to |
Unseat one pressure poppet-type and one return poppet. |
|
The major advantage of the manual slide-type hydraulic selector valve is its |
Metering ability. |
|
Normally, what positions hydraulic selector valves? |
Solenoid. |
|
The advantage of an electrically controlled solenoid valve is its |
Reduced weight. |
|
The difference between a selector valve and a servo valve is that the |
Servo valve controls fluid-flow. |
|
Another name for a flapper check valve is |
Gate check valve. |
|
What is the purpose of the arrow on a check valve? |
Show the direction of free flow through the valve. |
|
Which of these allows normal operating speed of a hydraulic actuator in one direction while limiting speed in the other direction? |
Relief valve. |
|
What are the basic units of a hydraulic hand pump system? |
Reservoir, pump, actuator, and manual shutoff valve. |
|
The reservoir supplies hydraulic fluid to a hand pump |
By gravity and the suction effect of the pump. |
|
When pressure in a hydraulic system with a variable-volume pump increases, fluid-flow |
Decreases. |
|
The purpose of the torsion links on a main landing gear is to |
Prevent the inner cylinder from rotating within the outer cylinder. |
|
How is the motion of the landing gear control lever transmitted to the selector valve? |
By a cable system. |
|
What prevents the lock solenoid from energizing when the nose landing gear is off center? |
Centering switch. |
|
Electromagnetic devices capable of sensing magnetically conducive metal targets on landing gears are known as |
Proximity sensors. |
|
A unit that is a combination of the landing gear shimmy damper and steering unit is known as |
A steer damper. |
|
What position must the landing gear control handle be in before emergency extension of the landing gear? |
DN. |
|
What slows the free fall of the main landing gear during the emergency extension sequence? |
Snubbing mechanism. |
|
The purpose of the landing gear warning horn is to |
Sound when the gear is not safe. |
|
Brake fade is defined as a gradual braking action |
Loss due to overheating. |
|
A major disadvantage of multiple disc brakes is that they |
Warp when overheated. |
|
What automatically compensates for brake wear on the segmented rotor brake? |
Adjusters. |
|
The purpose of the antiskid system is to |
Prevent wheel skid by releasing pressure from the skidding wheel. |
|
The purpose of deboosters is to |
Reduce braking pressure. |
|
Aircraft wheels are normally constructed of |
Magnesium and/or aluminum alloys. |
|
Split wheels are balanced |
Individually by halves. |
|
What maintains an airtight seal between split wheel halves? |
An O-ring seal. |
|
What prevents tire explosion from excessive heat buildup? |
Thermal relief plugs. |
|
What type of bearings is used on aircraft wheels? |
Tapered roller. |
|
The bearing cone of an aircraft wheel bearing is also called the |
Inner race. |
|
When cleaning aircraft wheels, you should not use |
A wire brush. |
|
Installed bearing races should be free of scratches, dents, and |
Overheating marks. |
|
The main parts of an aircraft tire are the tread and sidewall, |
Cord body, and beads. |
|
What prevents pressure buildup and separation of cord plies or tread rubber on an aircraft tire? |
Vent holes. |
|
For tires 24 inches or greater outside diameter, the tire must be removed when wear reaches the bottom of any tread groove for a continuous length of |
12 inches. |