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Engine Instrument Sy
O&P(P)
| Question | Answer |
|---|---|
| What are three types of flow-indicating systems used in a turbine engine | Vane-type flow meters, synchronous mass-type flow meters, and electric motorless mass flow meters |
| What do mass flo systems measure | The mass of the flow. This is affected by the density of the fuel which is in turn affected by the fuel temp |
| In what unit is an electronic motorless mass flow meter system calibrated | Pounds per hour of fuel flow |
| What is indicated ins a turbine engine if the fuel flow for all conditions is high | If there are other instrument abnormalities, there are possible damaged turbine components |
| Who is authorized to repair a fuel flow indicating system | The components can be repaired only by an FAA repair station certificated for the particular instruments |
| Where can you find the electrical power requirements for a fuel flow indicating system | Aircraft maintenance manual |
| Where in the fuel system is the fuel flow transmitter located | Between the fuel control and fuel nozzles |
| What type of instrument system is used for measuring cylinder head temp and exhaust gas temp | Thermocouple system |
| What kind of electrical instrument system is used for measuring oil temperature | A ratiometer type system |
| What should a thermocouple cylinder head temp indicator read when the engine is cold | The same as the outside air temp gauge |
| What is critical in the installation of the thermocouple leads for a cylinder head temp indicator, the length of the leads or their resistance | The resistance is critical, it must have the resistance specified on the indicator. This is usually 2 or 8 ohms |
| What should a ratiometer temp indicator read when the electrical power is off | The pointer should be off scale to the low side |
| How does a ratiometer type oil temp gauge measure the temp of the oil | A ratiometer measures the resistance of the temp bulb. The indicator is calibrated in degrees Fahrenheit or Celsius rather than in ohms |
| What kind of tachometer is used on most small single engine airplanes | A magnetic drag tach that is similar to an automobile speedometer |
| What would likely cause the pointer of a magnetic drag tach to oscilate | Either a dry cable connecting the indicator to the engine, or a kink in the cable housing |
| What kind of tach is used on most large multi engine airplanes | A three phase AC electric tach |
| What is measured to indicate the engine RPM with a three phase AC electric tach | The frequency of the AC the tachometer generator produces |
| What kind of indicator mechanism is used to measure oil pressure | Bourdon tube |
| What kind of indicator mechanism is used to measure manifold pressure | A differential bellows |
| What should a manifold pressure gauge read when the engine is not operating | The existing barometric pressure as indicated on the altimeter barometric scale when the altimeter pointers are set to the surveyed field evelation |
| What type of fitting used to connect an oil pressure gauge to the engine | A fitting with a restrictor that smooths out the pulsations and should a break occur in the indicator line, prevents a serious loss of engine oil |
| What is used to fill the line between a fuel pressure gauge and the fuel metering system | Light oil such as kerosine |
| What could cause a fuel pressure gauge to fluctuate | The loss of the light oil in the line between the gauge and the engine |
| What is the range of pressure needed for a fuel pressure gauge used in a float carburetor | Normally from 1 to 25 psi |
| What are the colors used in annunciator indicating systems, and what do they represent | Green indicates a safe condition, yellow indicates a caution alert, red indicates a warning alert |
| What kind of indicating system is used to measure oil temp in a small single engine, general aviation airplane | A sealed system in which a bulb, partially filled with a highly volatile liquid, is installed inside the oil strainer. The bulb is connected to a pressure gauge by a copper tube. The pressure of the has above the liquid is proportional to the temp of the |
| What does a torquemeter meaasure | Most torque system use an oil pressure output from a torquw valve to indicate actual engine power output at various power settings. The torquemeter indicates the amount of torque being produced at the prop shaft. A helical gear moves back and forth as the |
| What does the engine pressure ratio (EPR) indicator measure | EPR is an indication of the thrust being developed by a turbofan engine and is used to set power for takeoff on many types of aircraft. It is instrumented by total pressure pickups int the engine inlet and in the turbine exhaust |
| What is an EICAS (engine indicating and crew alerting system) | EICAS is an electronic instrumentation system that monitors airframe and engine parameters and displays the essential info on a video display on the instrument panel. Only vital info is continually displayed, but when any sensed parameters fall outside of |
| What is an engine FADEC (full authority digital electronic control) system | FADEC is a digital electronic fuel control for a gas turbine engine that is functioning during all engine operations, hence full authority. It includes EEC and functions with thr flight management computer. FADEC schedules the fuel to the nozzles in such |
| What is an ECAM system | ECAM (electronic centralized aircraft monitor) is a system that monitors airframe and engine functions and displays them in the flight deck. It can also provide checklists for system failures |
| What do the colors red, green, and yellow indicate on an aircraft instrument or gauge | Red indicates a maximum range or limit, Green indicates a normal operating range, Yellow indicates a caution range |
Created by:
tbarth
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