Petroleum base hydraulic fluid is which color?
Purple. Blue. Red.
Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet ports in order to assure emergency supply of fluid. The outlet port with the standpipe in it furnishes fluid to the:
emergency pump when the fluid supply to the normal system has been depleted. emergency pump at any time it is required. normal system power pump.
What is one purpose of a fuel tank vent?
To maintain atmospheric pressure. To decrease fuel vapor pressure. To decrease tank internal air pressure.
How should a welding torch flame be adjusted to weld stainless steel?
Slightly carburizing. Slightly oxidizing. Neutral.
A rivet set used to drive MS20470 rivets should:
have the same radius as the rivet head. have a slightly greater radius than the rivet head. be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted.
Why are jet fuels more susceptible to water contamination than aviation gasoline?
Jet fuel has a higher viscosity than gasoline. Jet fuel is lighter than gasoline; therefore, water is more easily suspended. Condensation is greater because of the higher volatility of jet fuels.
A typical large transport aircraft fuel manifold system allows how many of the following? 1. All tanks can be serviced through a single connection. 2. Any engine can be fed from any tank. 3. All engines can be fed from all tanks simultaneously. 4. A damaged tank can be isolated from the rest of the fuel system.
Two. Three. Four.
When checking a freon system, a steady stream of bubbles in the sight gauge indicates the charge is:
high. correct. low.
The dimensions of an MS20430AD-4-8 rivet are:
1/8 inch in diameter and 1/4 inch long. 1/8 inch in diameter and 1/2 inch long. 4/16 inch in diameter and 8/32 inch long.
What controls the inflation sequence in a pneumatic deicer boot system?
Shuttle valve. Vacuum pump. Distributor valve.
Which statement is correct when an aircraft has not been approved for return to service after an annual inspection because of several items requiring minor repair?
Only the person who performed the annual inspection may approve the aircraft for return to service. An appropriately rated mechanic may repair the defects and approve the aircraft for return to service. An appropriately rated mechanic may repair the defects, but an IA must approve the aircraft for return to service.
A faint line running across the grain of a wood spar generally indicates:
compression failure. shear failure. decay.
Residual voltage is a result of magnetism in the:
field windings. field shoes. armature.
Installed radio equipment is protected from damage due to jolts and vibration by:
shock mounts. spring and/or viscous damper mounted racks. rubber or foam cushioning material between circuit chassis and case.
How does the magnetic brake used to stop rotation of an electric motor armature operate?
Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re-engages the cog when the electrical power is turned off. A friction brake is applied by a magnet and released by a spring. A friction brake is applied by a spring and released by a magnet.
The circuit breaker in the instrument lighting system protects the:
lights from too much current. wiring from too much current. wiring from too much voltage.
After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed
hand pump inport check valve. inport/outport orifice check valve. hand pump outport check valve.
The best method of repair for a fabric-covered surface which has an L-shaped tear, each leg of which is approximately 14 inches long, is to:
re-cover the entire bay in which the tear is located. sew from the end of each leg to the center of the tear with a baseball stitch and then dope on a patch. sew with a baseball stitch from the center of the tear out toward the extremity of each leg and then dope on a patch.
When would a U.S. resident NOT be required to hold a Federal Communications Commission (FCC) Restricted Radio Telephone Operator Permit to operate twoway aircraft VHF radio equipment?
When flying to or communicating with destinations outside the United States. When flying or communicating within the United States. When the radio equipment is operated in aircraft certified for VFR flight only.
What happens to the output of a constant-displacement hydraulic pump when the hydraulic system pressure regulator diverts the fluid from the system to the reservoir?
The output pressure remains the same, but the volume reduces. The output pressure reduces, but the volume remains the same. The output pressure and volume remain the same.
Which procedure must be followed when defueling aircraft with sweptback wings?
Defuel all the tanks at one time. Defuel the inboard wing tanks first. Defuel the outboard wing tanks first.
Why is it necessary to vent all aircraft fuel tanks?
To ensure a positive head pressure for a submerged boost pump. To exhaust fuel vapors. To limit pressure differential between the tank and atmosphere.
Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air-conditioning?
Turbine compressor. Inlet compressor. C-D inlet compressor duct.
Aircraft pressure fueling systems instructional procedures are normally placarded on the:
fuel control panel access door. lower wing surface adjacent to the access door. aircraft ground connection point.
A helicopter in forward flight, cruise configuration, changes direction by:
varying the pitch of the main rotor blades. changing rotor RPM. tilting the main rotor disk in the desired direction.
The starting current of a series-wound do motor, in passing through both the field and armature windings, produces a:
low starting torque. speed slightly higher when unloaded. high starting torque.
Hydraulic system thermal relief valves are set to open at a:
lower pressure than the system relief valve. higher pressure than the system relief valve. lower pressure than the system pressure regulator.
If two actuating cylinders which have the same cross-sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert:
different amounts of force but will move at the same rate of speed. equal amounts of force but will move at different rates of speed. equal amounts of force and will move at the same rate of speed.
To what depth is the mica insulation between the commutator bars of a dc generator undercut?
One half the width of the mica. Equal to twice the width of the mica. Equal to the width of the mica.
A fire-extinguisher container can be checked to determine its charge by:
attaching a remote pressure gauge. weighing the container and its contents. a hydrostatic test.
Bonding connections should be tested for: resistance value rectance amperage value.
How much clearance from the seat bottom is required when installing radio equipment under a seat? 3 inches with the seat unoccupied no set minimum as long as the equipment receives adequate cooling and damage protection 1 inch with the seat occupied and subjected to maximum downward seat spring deflection.
When a butt welded joint is visually inspected for penetration: the penetration should be 100 percent of the thickness of the base metal look for evidence of excessive heat in the form of a very high bead the penetration should be 25 to 50 percent of the thickness of the base metal.
If a high pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the: department of transportation aircraft manufacturer or the cylinder manufacturer national transportation safety board or the standards of compressed gas cylinders.
In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read: either the component or the circuit is shorted the component has continuity and is not open the component has continuity and is open.
Which of the following may be used for the repair of fuel leaks on most integral fuel tanks? welding and resealing riveting and resealing brazing and resealing.
Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protectedfrom chafting by: wrapping with plastic using a suitable grommet wrapping with electrical tape.
Fiberglass laminate damage that extends completely through one facing and into the core: cannot be repaired requires the replacement of the damaged core and facing can be repaired by using a typical metal facing patch.
The pressure source for power brakes is: the main hydraulic system a master cylinder the power brake reservoir.
In an autopilot, which signal nullifies the input signal to the ailerons? followup signal course signal displacement signal.
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