FAA Engine Fuel and Fuel Metering Systems (2)

Which method is commonly used to adjust the level of a float in a float-type carburetor?. Lengthening or shortening the float shaft. Add or remove shims under the needle-valve seat. Change the angle of the float arm pivot.

If the main air bleed of a float-type carburetor becomes clogged, the engine will run. lean at rated power. rich at rated power. rich at idling.

The primary condition(s) that allow(s) microorganisms to grow in the fuel in aircraft fuel tanks is (are). warm temperatures. the presence of water. the presence of dirt or other particulate contaminants.

During engine operation, if carburetor heat is applied, it will. increase fuel/air ratio. increase engine RPM. decrease the air density to the carburetor.

A major difference between the Teledyne-Continental and RSA (Precision Airmotive or Bendix) continuous flow fuel injection systems in fuel metering is that the. RSA system uses air pressure only as a metering force. Continental system utilizes airflow as a metering force. Continental system uses fuel pressure only as a metering force.

The back-suction mixture control system operates by. varying the pressure within the venturi section. Varying the pressure acting on the fuel in the float chamber. changing the effective cross-sectional area of the main metering orifice (Jet).

A fuel strainer or filter must be located between the. boost pump and tank outlet. tank outlet and the fuel metering device. boost pump and engine-driver fuel pump.

Which of the following is least likely to occur during operation of an engine equipped with a direct cylinder fuel injection system?. Afterfiring. Kickback during start. Backfiring.

Where is the main fuel strainer located in the aircraft fuel system?. At the highest point in the fuel system. At the lowest point in the fuel system. At the inlet chamber of the carburetor.

What will occur if the vapor vent float in a pressure carburetor loses its buoyancy?. The amount of fuel returning to the fuel tank from the carburetor will be increased. The engine will continue to run after the mixture control is placed in IDLE CUTOFF. A rich mixture will occur at all engine speeds.

If fuel is found running from the carburetor with the engine not running, the likely cause is that the. float needle valve is not seated properly. float level is adjusted too low. main air bleed is clogged.

The fuel level within the float chamber of a properly adjusted float-type carburetor will be. slightly higher than the discharge nozzle outlet. slightly lower than the discharge nozzle outlet. at the same level as the discharge nozzle outlet.

When trimming a turbine engine, the fuel control is adjusted to. Produce as much power as the engine is capable of producing. set idle RPM and maximum speed or EPR. allow the engine to produce maximum RPM without regard to power output.

During what period does the fuel pump bypass valve open and remain open?. When the fuel pump pressure is greater than the demand of the engine. When the boost pump pressure is greater than fuel pump pressure. When the fuel pump output is greater than the demand of the carburetor.

The use of less than normal throttle opening during starting will cause. a rich mixture. a lean mixture. backfire due to lean fuel/air ratio.

If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the air-fuel mixture will become. leaner as either the altitude or temperature increases. richer as the altitude increases and leaner as the temperature increases. richer as either the altitude or temperature increases.

The throttle valve of float-type aircraft carburetors is located. ahead of the venturi and main discharge nozzle. after the main discharge nozzle and ahead of the venturi. between the venturi and the engine.

If an engine equipped with a float-type carburetor backfires or misses when the throttle is advanced, a likely cause is that the. float level is too high. main air bleed is clogged. accelerating pump is not operating properly.

The fuel systems of aircraft certificated in the standard classification must include which of the following?. An engine-driven fuel pump and at least one auxillary pump per engine. A positive means of shutting off the fuel to all engines. A reserve supply of fuel, available to the engine only after selection by the flightcrew, sufficient to operate the engines at least 30 minutes at METO power.

(Refer to Figure 7.) What is the purpose of the fuel transfer ejectors?. To supply fuel under pressure to the engine-driven pump. To assist in the transfer of fuel from the main tank to the boost pump sump. To transfer fuel from the boost pump sump to the wing tank.

Fuel crossfeed systems are used in aircraft to. purge the fuel tanks. jettison fuel in an emergency. maintain aircraft stability.

Which statement is true regarding proper throttle rigging of an airplane?. The throttle stop on the carburetor must be contacted before the stop in the cockpit. The stop in the cockpit must be contacted before the stop on the carburetor. The throttle control is properly adjusted when neither stop makes contact.

What method is ordinarily used to make idle speed adjustments on a float-type carburetor?. An adjustable throttle stop or linkage. An orifice and adjustable tapered needle. An adjustable needle in the drilled passageway which connects the airspace of the float chamber and the carburetor venturi.

What occurs when a back-suction type mixture control is placed in IDLE CUTOFF?. The fuel passages to the main and idle jets will be closed by a valve. The float chamber will be vented to a negative pressure area. The fuel passage to the idle jet will be closed by a valve.

Which of the following statements is true?. The mixture used at rated power in air cooled reciprocating engines is leaner than the mixture used through the normal cruising range. The mixture used at idle in air cooled reciprocating engines is leaner than the mixture used at rated power. The mixture used at idle in air cooled reciprocating engines is richer than the mixture used at rated power.

If a float-type carburetor becomes flooded, the condition is most likely caused by. a leaking needle valve and seat assembly. the accelerating pump shaft being stuck. a clogged back-suction line.

The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be. 125 percent of the takeoff fuel consumption of the engine. 125 percent of the maximum, except takeoff, fuel consumption of the engine. 150 percent of the takeoff fuel consumption of the engine.

An electronic engine control (EEC) is a system that receives engine operating information and. adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation. develops the commands to various actuators to control engine parameters. controls engine operation according to ambient temperature, pressure, and humidity.

On a float-type carburetor, the purpose of the economizer valve is to. provide extra fuel for sudden acceleration of the engine. maintain the leanest mixture possible during cruising best power. provide a richer mixture and cooling at maximum power output.

Where physical separation of the fuel lines from electrical wiring or conduit is impracticable, locate the fuel line. below the wiring and clamp the line securely to the airframe structure. above the wiring and clamp the line securely to the airframe structure. inboard of the wiring and clamp both securely to the airframe structure.