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231b1abeb3b7df36 | receive and process input signals from aircraft and engine sensors and send the data to the appropriate display. The CRT is the display unit used in an EFIS. It displays alphanumeric data and graphic displays that represent the aircraft instruments. 638. Stall warning systems are generally designed to begin warning the... | 100 | 465 | |
231b1abeb3b7df36 | The angle-of-attack detector operates from differential pressure when the airstream A. is parallel to the longitudinal axis of the aircraft. B. is not parallel to the true angle of attack of the aircraft. C. is parallel to the angle of attack of the aircraft. The angle-of-attack indicating system consists of an airstre... | 101 | 430 | |
231b1abeb3b7df36 | The angle of attack system installed in some aircraft measures a differential pressure at the point the airstream flows in a direction not parallel to the true angle of attack of the aircraft. 650. The primary purpose of a takeoff warning system is to alert the crew that a monitored flight control is not properly set p... | 102 | 464 | |
231b1abeb3b7df36 | A blue radial line is used on an airspeed indicator to indicate single-engine, best- rate-of-climb speed for a multiengine aircraft. 158 of 252 2/17/26, 13:31 656. Which of the following instrument discrepancies would require replacement of the instrument? A. Case leaking, glass cracked, instrument will not zero out, o... | 103 | 508 | |
231b1abeb3b7df36 | According to 14 CFR 91.207, the batteries of an ELT MUST be replaced or recharged (if they are rechargeable): - By the date marked on the outside of the transmitter. - When the transmitter has been in use for more than one cumulative hour. - When 50 percent of their useful life has expired. 663. A gasket or sealant is ... | 104 | 497 | |
231b1abeb3b7df36 | Operation of an ELT is verified by tuning a communications receiver to 406 MHz and activating the transmitter for no more than three audible sweeps. The test must be conducted within the first five minutes after any hour. If the ELT must be operated outside of this time frame, you should contact the control tower befor... | 105 | 535 | |
231b1abeb3b7df36 | transmitting a signal and receiving back a reflected signal. B. receiving signals transmitted from ground radar stations. C. means of transponder interrogation. A radar altimeter measures the height of the aircraft above the ground by transmitting a VHF signal vertically downward from the aircraft and receiving the ref... | 106 | 511 | |
231b1abeb3b7df36 | A satellite weather antenna. Figure 30 depicts a lightning detector system antenna. 683. A DME antenna should be installed on the aircraft in a position that will A. not be blanked out by the wing when the aircraft is banked. B. not be blanked out by the vertical stabilizer. C. facilitate cleaning, inspection, and main... | 107 | 509 | |
231b1abeb3b7df36 | The FCC regulations require a restricted radio telephone operator permit only when the aircraft is operated outside the United States. 691. Aircraft antenna must be grounded to the B. wing spar. C. bus bar. When an aircraft radio antenna installation is required to be grounded, it is grounded to the airframe structure.... | 108 | 503 | |
231b1abeb3b7df36 | Figure 27 depicts an aircraft radar beacon transponder antenna. 699. What is the operating principle of the sensing device used in an autopilot system? A. The reaction of the force 90° away from the applied force in the direction of gyro rotation. B. The relative motion between a gyro and its supporting system. C. The ... | 109 | 503 | |
231b1abeb3b7df36 | When such equipment is installed, a new weight and balance record must be made showing the change in the empty weight and empty-weight CG of the aircraft. The addition of avionics equipment will decrease the useful load of the aircraft. 706. A radar altimeter indicates A. flight level (pressure) altitude. B. altitude a... | 110 | 468 | |
231b1abeb3b7df36 | Static dischargers are mounted on the trailing edges of aircraft control surfaces to conduct charges of static electricity into the atmosphere before they build up enough voltage to cause a high current to flow and cause radio interference. By the proper design and location of these dischargers, the static charges will... | 111 | 498 | |
231b1abeb3b7df36 | A satellite weather antenna. Figure 31 depicts a marker beacon receiver antenna. 722. (Refer to Figure 29.) What kind of antenna is this? A. A glide slope antenna. B. A VOR and localizer antenna. C. A radar beacon transponder antenna. Figure 29 depicts a VOR and localizer antenna. 723. Which of the following is a two-w... | 112 | 487 | |
231b1abeb3b7df36 | Which of the following provides manual maneuverability of the aircraft while the autopilot is engaged? B. Directional gyro indicator. C. Flight controller. The flight controller allows the pilot to provide manual maneuverability to the aircraft when the autopilot is engaged. The pilot can insert a command signal throug... | 113 | 515 | |
231b1abeb3b7df36 | It can also be used to thaw ice that has formed on the fuel screen. 736. Microbial growth is produced by various forms of micro-organisms that live and multiply in the water interfaces of jet fuels. Which of the following could result if microbial growth exists in a jet fuel tank? A. Interference with fuel flow, interf... | 114 | 494 | |
231b1abeb3b7df36 | In a large aircraft manifold fuel system, all tanks can be serviced through a single connection, any engine can be fed from any tank, all engines can be fed from all tanks simultaneously, and a damaged tank can be isolated from the rest of the fuel system. 744. What unit is generally used to actuate the fuel pressure w... | 115 | 503 | |
231b1abeb3b7df36 | If a rubberized fabric bladder tank is to remain empty for an extended period of time, it should be cleaned out thoroughly and its interior covered with a film of clean engine oil. 751. The presence of fuel stains around a fuel nozzle would indicate A. too much fuel pressure. B. excessive airflow across the venturi. C.... | 116 | 506 | |
231b1abeb3b7df36 | Flapper valves allow fuel to flow to the booster pump but prevent its flowing away from the pump during certain flight maneuvers. 758. Fuel jettisoning past the limits prescribed by Federal Aviation Regulations is usually prevented by A. closely monitoring the fuel quantity and turning off the fuel dump switch(es). B. ... | 117 | 495 | |
231b1abeb3b7df36 | The totalizer adds the quantites of fuel in all of the tanks and gives the pilot an indication of the total number of pounds of fuel remaining. 764. What is the purpose of a float-operated transmitter installed in a fuel tank? A. It sends an electric signal to the fuel quantity indicator. B. It senses the total amount ... | 118 | 508 | |
231b1abeb3b7df36 | By the engine-driven pump's design and internal clearance. B. By the first check valve downstream from the pump. C. By the pump's design and internal clearances. The outlet fuel pressure produced by a submerged, single-speed, centrifugal-type fuel pump is determined by the pump's design and its internal clearances and ... | 119 | 489 | |
231b1abeb3b7df36 | What must each fuel quantity indicator be calibrated to read during level flight when the quantity of fuel remaining is equal to the unusable fuel supply? A. The total unusable fuel quantity. B. Both the total unusable fuel quantity and the unusable fuel quantity in each tank. Each fuel quantity indicator must be calib... | 120 | 499 | |
231b1abeb3b7df36 | Turbine engine fuel may have moisture entrained in it that will condense out and freeze on the fuel filters. This ice will shut off the flow of fuel to the engines. To eliminate this danger, anti-icing additives may be put in the turbine fuel to lower the freezing temperature of the water and prevent its freezing on th... | 121 | 509 | |
231b1abeb3b7df36 | A fuel strainer differential pressure gauge gives an indication that ice crystals have already formed and are restricting the fuel filter. Ice crystals on the filter element cause an excessive pressure drop across the filter. 791. Which procedure must be followed when defueling aircraft with sweptback wings? A. Defuel ... | 122 | 486 | |
231b1abeb3b7df36 | Transmits an electrical signal to fluid pressure. B. Converts fluid pressure to an electrical signal. C. Transmits fluid pressure directly to the indicator. The transmitter in a fuel pressure warning system converts the pressure of the fuel into an electrical signal that turns on a warning light or flashes a warning on... | 123 | 513 | |
231b1abeb3b7df36 | Integral fuel tanks are actually a part of the aircraft structure in which all of the seams and riveted joints are sealed with an appropriate sealant. The fuel is carried in the sealed-off aircraft structure. 804. The electronic-type fuel quantity indicating system consists of a bridge circuit, A. an amplifier, an indi... | 124 | 489 | |
231b1abeb3b7df36 | What method would be used to check for internal leakage of a fuel valve without removing the valve from the aircraft? A. Place the valve in the OFF position, drain the strainer bowl, and with boost pump on, watch to see if fuel flows to the strainer bowl. B. Remove fuel cap(s), turn boost pump(s) on, and watch for bubb... | 125 | 526 | |
231b1abeb3b7df36 | Turbine engine fuel holds water more readily than gasoline. Microorganisms live in this water and form a scum which clogs the fuel filters, lines, and fuel controls. The scum holds water against the fuel tank structure and causes tank corrosion. 816. Many fuel tanks incorporate _________________ valves to prevent fuel ... | 126 | 501 | |
231b1abeb3b7df36 | 821. When inspecting a removable rigid fuel tank for leaks, what procedure should be followed? A. pressurize the tank with air and brush with soapy water. B. fill the tank with water and pressurize with air and brush with soapy water. C. pressurize the tank with air and submerge in water to locate leaks. After a remova... | 127 | 503 | |
231b1abeb3b7df36 | Aromatic additives in aviation gasoline increase its antidetonation characteristics, but they also cause deterioration of rubber parts. Any hose, seal, or diaphragm used with a fuel that contains aromatic additives must be specifically formulated to withstand these additives. 197 of 252 2/17/26, 13:31 828. What can be ... | 128 | 483 | |
231b1abeb3b7df36 | An electronic (capacitance-type) fuel quantity indicating system incorporates a signal amplifier. 835. What unit would be adjusted to change the fuel pressure warning limits? A. Fuel flowmeter bypass valve. B. Pressure-sensitive mechanism. C. Fuel pressure relief valve. The contacts on the pressure-sensitive mechanism ... | 129 | 469 | |
231b1abeb3b7df36 | Turbine-engine fuel will cause severe detonation when a reciprocating engine is operated at takeoff power. 842. When moving the mixture control on a normally operating engine into the idle cutoff position, engine RPM should A. slightly increase before the engine starts to die. B. slightly decrease and then drop rapidly... | 130 | 514 | |
231b1abeb3b7df36 | coat the connector with grease. B. use a special moisture-proof type. C. spray the connector with varnish or zinc-chromate. When electrical connectors are exposed to moisture, a special moisture-proof-type connector should be used. 850. An ammeter in a battery charging system is for the purpose of indicating the A. amp... | 131 | 490 | |
231b1abeb3b7df36 | Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to A. prevent current return paths. B. allow static charge accumulation. C. prevent development of radio frequency potentials. The most reasonable choice is that electrically grounding a conductive object prev... | 132 | 481 | |
231b1abeb3b7df36 | This arrangement minimizes the possibility of a short between a connector and ground when the connectors are separated. 861. During inspection of an anticollision light installation for condition and proper operation, it should be determined that A. electrical or mechanical interconnections are provided so that the ant... | 133 | 463 | |
231b1abeb3b7df36 | In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder? A. The brush pigtail. B. Brush spring tension. 206 of 252 2/17/26, 13:31 C. Undercutting the mica on the commutator. The brush pigtail eliminates any possible sparking between the brush and... | 134 | 501 | |
231b1abeb3b7df36 | Electric circuits are protected from overheating by B. AN/MS connectors. Electrical circuits are protected from overheating by means of fuses or circuit breakers. 874. Which of the following statements is true? A. There are two basic types of DC motors: series and compound. B. In the compound motor, the field windings,... | 135 | 481 | |
231b1abeb3b7df36 | show high resistance when the meter prods are connected to the terminals of the coil. C. show very low resistance if it is a series field coil. Series field coils are wound of relatively few turns of heavy wire and have a very low resistance. All of the generator output current flows through them. 881. Major adjustment... | 136 | 507 | |
231b1abeb3b7df36 | Which of the following is not one of the purposes of interpoles in a generator? A. Reduce field strength. B. Overcome armature reaction. C. Reduce arcing at the brushes. 211 of 252 2/17/26, 13:31 Interpoles are used in high-output compound-wound DC generators to counteract field distortion and to overcome armature reac... | 137 | 506 | |
231b1abeb3b7df36 | 894. The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a A. double-pole, single-throw (DPST), two-position switch. B. single-pole, double-throw (SPDT), two-po... | 138 | 511 | |
231b1abeb3b7df36 | Anytime an electrical cable, a wire bundle, or an individual wire comes into contact with some moving part of the aircraft, the wire must be protected by passing it through conduit. 902. A circuit breaker is installed in an aircraft electrical system primarily to protect the A. circuit and should be located as close to... | 139 | 505 | |
231b1abeb3b7df36 | With both ends of the field at ground potential, there can be no field current. The only magnetic field for the armature windings to cut is that caused by the permanent magnetism in the generator field frame. Permanent magnetism in the field frame produces residual voltage, which is somewhere between one and two volts.... | 140 | 496 | |
231b1abeb3b7df36 | The Magnesyn remote indicating system uses a permanent magnet as its rotor. 915. Which type of DC generator is not used as an airplane generator? A. Externally grounded. B. Series wound. C. Compound wound. Series-wound DC generators are not used in aircraft electrical systems because of the difficulty in regulating and... | 141 | 498 | |
231b1abeb3b7df36 | Which of the following must be accomplished when installing an anticollision light? A. Install a switch independent of the position light switch. B. Use shielded electrical cable to assure fail-safe operation. C. Connect the anticollision light to the aircraft position light switch. When installing an anticollision lig... | 142 | 471 | |
231b1abeb3b7df36 | A friction brake is applied by a spring and released by a magnet. A magnetic brake used to stop rotation of an electric-motor armature is applied by spring force and is released by an electromagnet energized when the motor is turned on. As soon as the motor is turned off, the spring applies the brake and stops the rota... | 143 | 503 | |
231b1abeb3b7df36 | Locate the bundle above flammable fluid lines and securely clamp to structure. Any time a wiring bundle is installed in an aircraft in such a way that it passes through a compartment parallel to a fluid line carrying flammable fluids, the bundle should be routed above the fluid line, and it should be clamped securely t... | 144 | 465 | |
231b1abeb3b7df36 | low starting torque. B. speed slightly higher when unloaded. C. high starting torque. 223 of 252 2/17/26, 13:31 A series-wound DC motor has a very high starting torque because all of the current that passes through the armature also passes through the field. 940. When adding a rheostat to a light circuit to control the... | 145 | 496 | |
231b1abeb3b7df36 | Aircraft that use AC generators as the primary source of electrical power usually have a transformer-rectifier unit to provide direct current where it is needed. 947. (Refer to Figure 18.) Which of the batteries are connected together incorrectly? The batteries in 1 are connected correctly in a series circuit. The batt... | 146 | 508 | |
231b1abeb3b7df36 | current rating with the contacts closed. The nominal current rating of conventional aircraft switches is usually stamped on the switch housing. This rating represents the continuous current rating of the switch with the contacts closed. 954. When necessary during operation, CSD disconnect is usually accomplished by A. ... | 147 | 490 | |
231b1abeb3b7df36 | either the component or the circuit is shorted. C. the component has continuity and is not open. If the ohmmeter is connected correctly and indicates some value of resistance, current is flowing through the component and it has continuity. It is not open. 961. Residual voltage is a result of magnetism in the 228 of 252... | 148 | 520 | |
231b1abeb3b7df36 | An AC selsyn system is a widely used electrical method of indicating a remote mechanical movement or position. B. A resistance-type indicating system is an electrical system used for transmitting information from one point to another. C. A synchro-type indicating system is an electrical system used for transmitting inf... | 149 | 475 | |
231b1abeb3b7df36 | The general rule of thumb for replacing aluminum electrical cable with copper is that copper of two wire gages smaller (larger number) may be used to replace aluminum. This rule does not hold in this instance. According to the current-carrying capacity charts in Figures 11.5 and 11.6 of AC 43.13-1, a 6-gage aluminum el... | 150 | 516 | |
231b1abeb3b7df36 | Eddy currents produce heat and are a source of power loss in the generator. 979. What controls the inflation sequence in a pneumatic deicer boot system? A. Shuttle valve. B. Vacuum pump. C. Distributor valve. A distributor valve controls the inflation sequence in a pneumatic deicer boot system. 980. What icing conditio... | 151 | 494 | |
231b1abeb3b7df36 | Why are the tubes in deicer boots alternately inflated? A. Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum. B. Alternate inflation of deicer boot tubes does not disturb airflow. C. Alternate inflation of deicer boot tubes relieves the load on the air pump. Pneumatic deicer boots a... | 152 | 482 | |
231b1abeb3b7df36 | Anti-icing fluid. C. Hot air. Ice should be melted from the inside of a turbine engine by flowing warm air through the engine until all of the rotating parts move freely. 995. Arcing in an electrically heated windshield panel usually indicates a breakdown in the A. temperature-sensing elements. C. conductive coating. A... | 153 | 433 | |
231b1abeb3b7df36 | An aircraft windshield that has an integral heater laminated into the panel uses a 115-volt AC power supply, an autotransformer, a heat-control toggle switch, a heat control relay and indicating lights, but no DC power supply. 1001. Prior to installation of a pneumatic surface-bonded type deicer boots, on the leading e... | 154 | 514 | |
231b1abeb3b7df36 | After passing through the pump, this oil is discharged with the exhaust air. The oil separator removes the oil from the air and returns it to the engine crankcase. Getting rid of this oil, before the air reaches the deicer boots, helps prevent their deterioration. 1007. Light refraction smoke detectors are activated wh... | 155 | 484 | |
231b1abeb3b7df36 | Smoke detectors that measure the light transmissibility of the air (the ability of the air to allow light to pass through it) are called photoelectrical devices. 1014. Which fire-extinguishing agent is considered to be the least toxic? A. Carbon dioxide. B. Bromotrifluoromethane (Halon 1301). C. Bromochloromethane (Hal... | 156 | 488 | |
231b1abeb3b7df36 | The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in A. parallel with each other, and in parallel with the indicator lights. B. parallel with each other, but in series with the indicat... | 157 | 459 | |
231b1abeb3b7df36 | Display 'No Smoking' placards, provide adequate fire-fighting equipment, keep all tools and oxygen servicing equipment free from oil or grease, and avoid checking aircraft radio or electrical systems. All four items listed here are safety precautions to be followed when working with an oxygen system. 1027. Smoke in the... | 158 | 438 | |
231b1abeb3b7df36 | Before connecting the cartridge terminals to the electrical system, the system should be checked with a voltmeter to be sure that there is no voltage at the terminal connections. 1032. What occurs when a visual smoke detector is activated? A. A warning bell within the indicator alarms automatically. B. A lamp within th... | 159 | 484 | |
231b1abeb3b7df36 | It allows the rotors to turn slowly as the engine RPM increases. 247 of 252 2/17/26, 13:31 Since lift in a helicopter is provided by rotating airfoils, these airfoils must be free to rotate if the engine fails. The freewheeling unit automatically disengages the engine from the main rotor when engine RPM is less than ma... | 160 | 501 | |
231b1abeb3b7df36 | A helicopter in forward flight, cruise configuration, changes direction by A. varying the pitch of the main rotor blades. B. changing rotor RPM. C. tilting the main rotor disk in the desired direction. A helicopter in forward-flight cruise configuration changes its direction by tilting the main rotor disk in the desire... | 161 | 493 | |
231b1abeb3b7df36 | anti-torque system to become more efficient in the hover mode. On a single-rotor helicopter with an antitorque tail rotor, the torque of the main rotor tends to rotate the fuselage in a clockwise direction as viewed from above. The tail rotor compensates for this by attempting to rotate the fuselage in a counterclockwi... | 162 | 359 |
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