What safety device is usually located between the driving unit and hydraulic pump drive shaft?
Thermal relief valve. Pump motor safety switch. Pump drive coupling shear section.
The method most often used in overcoming the effect of armature reaction is through the use of:
Interpoles. shaded poles. drum-wound armatures in combination with a negatively connected series field.
Relief valves are used in pneumatic systems:
for one direction flow control. to reduce the rate of airflow. as damage-preventing units.
During inspection of an anticollision light installation for condition and proper operation, it should be determined that:
electrical or mechanical interconnections are provided so that the anticollision light will operate at all times that the position light switch is in the ON position. an appropriately rated fuse is in position at the light to protect the connecting wiring against electrical faults. the anticollision light can be operated independently of the position lights.
Magnetic compass bowls are filled with a liquid to:
retard precession of the float. reduce deviation errors. dampen the oscillation of the float.
Aircraft fuse capacity is rated in:
volts. ohms. amperes.
The length of a rivet to be used to join a sheet of .032-inch and.064-inch aluminum alloy should be equal to:
two times the rivet diameter plus .064 inch. one and one-half times the rivet diameter plus .096 inch. three times the rivet diameter plus .096 inch.
What should be used to inert an integral fuel tank before attempting repairs?
CO2. Water. Steam.
How can the direction of rotation of a do electric motor be changed?
Interchange the wires which connect the motor to the external power source. Reverse the electrical connections to either the field or armature windings. Rotate the positive brush one commutator segment.
What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system?
Low-pressure liquid. Low-pressure vapor. High-pressure vapor.
Which procedure should you use if you find a vacuum operated instrument glass loose? install another instrument mark the case and glass with a slippage mark replace the glass.
The altitude controller maintains cabin altitude by modulation of the: safety and outflow valves outflow valve safety valve.
Flapper valves are used in fuel tanks to: prevent a negative pressure act as check valves reduce pressure.
A drip gauge may be used to measure: fuel pump diaphragm leakage the amount of fuel in the tank system leakage with the system shut down.
What is used to flush a system normally serviced with MIL-H-5606 hydraulic fluid? lacquer thinner or trichlorethylene methyl ethyl ketone or kerosene naphtha or varsol.
The classification for fiberglass reinforcement material that has high resistivity and is the most common is:
E S G.
The type of fuel-boost pump that separates air and vapor from the fuel before it enters the line to the carburetor is the:
gear-type pump. centrifugal-type pump. sliding vane-type pump.
The purpose of a diaphragm in a vane type fuel pump is to:
equalize fuel pressure at all speeds. vary fuel pressure according to throttle setting. compensate fuel pressures to altitude changes.
The function of a CRT in an EFIS is to:
allow the pilot to select the appropriate system configuration for the current flight situation. display alphanumeric data and representations of aircraft instruments. receive and process input signals from aircraft and engine sensors and send the data to the appropriate display.
The basic difference between an autosyn and a magnesyn indicating system is the:
rotor. transmitter. receiver.
Where can information be obtained about the compatibility of fire-resistant hydraulic fluid with aircraft materials?
Manufacturer's technical bulletins. Aircraft manufacturer's specifications. AC 43.13-1 A.
The purpose of the vertical fin is to provide:
directional stability. longitudinal stability. lateral stability.
If an aircraft is fueled from a truck or storage tank which is known to be uncontaminated with dirt or water, periodic checks of the aircraft's fuel tank sumps and system strainers:
can be eliminated except for the strainer check before the first flight of the day and the fuel tank sump check during 100-hour or annual inspections. are still necessary due to the possibility of contamination from other sources. can be sharply reduced since contamination from other sources is relatively unlikely and of little consequence in modern aircraft fuel systems.
The primary purpose of a fuel tank sump is to provide a:
positive system of maintaining the design minimum fuel supply for safe operation. place where water and dirt accumulations in the tank can collect and be drained. reserve supply of fuel to enable the aircraft to land safely in the event of fuel exhaustion.
Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?
Distributor valve. Pressure regulator. Suction relief valve.
The primary function of the flap overload valve is to:
prevent the flaps from being lowered at airspeeds which would impose excessive structural loads. cause the flap segments located on opposite sides of the aircraft centerline to extend and retract together so that the aircraft will not become aerodynamically unbalanced to the extent that it becomes uncontrollable. boost normal system pressure to the flaps in order to overcome the air loads acting on the relatively large flap area.
If the IDG scavenge oil filter is contaminated with chunks or pieces of metal:
change the oil at 25 hour intervals. remove and replace the IDG. replace the oil and filter at 25 hour intervals.
Characteristics of MIL-H-7644 hydraulic fluid are:
red color, petroleum base, will burn, synthetic rubber seals. light purple color, phosphate ester base, fire resistant, butyl rubber seals. blue color, vegetable base, will burn, natural rubber seals.
Proper pre-preg composite lay-up curing is generally accomplished by 1. applying external heat. 2. room temperature exposure. 3. adding a catalyst or curing agent to the resin. 4. applying pressure.
2 and 3. 1 and 4. 1, 3, and 4.
An automatic damping action occurs at the steer damper if for any reason the flow of high-pressure fluid is removed from the:
outlet of the steer damper. inlet of the steer damper. replenishing check valve.
(Refer to Figure 20 .) What is the minimum circumstance that will cause the landing gear warning horn to indicate an unsafe condition? All gears up and one throttle retarded. Any gear up and both throttles retarded. Any gear not down and locked, and one throttle retarded.
Chatter in a hydraulic system is caused by:
excessive system pressure. insufficient system pressure. air in the system.
Smoke detection instruments are classified by their method of:
construction. maintenance. detection.
Electric wire terminals for most aircraft applications must be what type? ring hook slotted.
The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily: to prevent circuit failure due to terminal disconnection for permanent connection to the circuit for uncomplicated and rapid circuit connection and disconnection.
Aluminum wire must be stripped very carefully because: high resistance will develop in stripping nicks stripping nicks can cause short circuits individual strands will break easily after being nicked.
One purpose of a glowler test is to determine the presence of: an out of round commutator a broken field lead a shorted armature.
If a generator is equipped with a vibrator type voltage regulator, the actual time the voltage regulator points remain open: is controlled by the reverse current cutout relay point clearance depends on the load carried by the generator is increased when the external load is greater than the generator output.
To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the: o-ring seal gasket seal chevron seal.
What type of packings should be used in hydraulic components to be installed in a system containing skydrol? AN packings made of neopreme packing materials made for ester base fluids AN packings made of natural rubber.
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