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Aircraft Systems, Part 1

Atmospheric pressure at sea level is 14.7 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 alluminum 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 is 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 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 its 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 kilovolt ampere (KVA) generator is approximately 8,000 RPM
THe underspeed swith (USS) on the 60/80 KVA generator constant speed drive actuates at 365 Hz
What supplies rotary power to the input gear of the CSD Accessory gearbox
A bettery'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 psi of cf 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 seperate 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 retary 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 hydrualic 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 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? Restrictor check 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, the 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 targes 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 Down (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 gear is not safe
Brake fade is defined as a gradual braking action loss due to overheating
A major disadvantage of multilple 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 a aircraft tire are the tread and sidewall, cord body, and beads
What prevents pressure buildup and separation of cord piles 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
Created by: kmkotter
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