Aircraft Engine Instrument System Review

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Questions and Answers

What is the definition of engine pressure ratio?

The total pressure ratio between the aft end of the compressor and the aft end of the turbine (correct)

The total pressure ratio between the aft end of the turbine and the front of the engine inlet

The total pressure ratio between the front of the engine inlet and the aft end of the compressor

The total pressure ratio between the front of the compressor and the rear of the turbine

Which of the following instrument conditions requires immediate correction?

Case paint chipped

Red line missing

Pointer loose on shaft (correct)

Mounting screws loose

What is a characteristic of a thermocouple-type temperature indicating instrument system?

It is a digital-type, temperature-measuring instrument

It usually contains a balancing circuit in the instrument case (correct)

It is a balanced-type, variable resistor circuit

It requires an external power source

What produces the indication on a thermocouple-type cylinder head temperature indicator?

A current generated by the temperature difference between dissimilar metal hot and cold junctions Signup and view all the answers

What determines the voltage output of a thermocouple system?

The temperature difference between the two ends of the thermocouple Signup and view all the answers

What type of electric motors are commonly used in electric tachometers?

Direct current, series-wound motors Signup and view all the answers

What is provided by a computerized fuel system (CFS) with a totalizer-indicator, in addition to fuel quantity?

Fuel flow rate Signup and view all the answers

What is the primary function of a balancing circuit in a thermocouple-type temperature indicating instrument system?

To prevent fluctuations of the system voltage from affecting the temperature reading Signup and view all the answers

On a twin engine aircraft with fuel-injected reciprocating engines, what is the probable cause of a fuel-flow indicator reading considerably higher than the other in all engine operating configurations?

One more fuel nozzles are clogged Signup and view all the answers

What is the principal fault in the pressure type fuel flow meter indicating system installed on a horizontally opposed continuous-flow fuel-injected aircraft reciprocating engine?

A plugged fuel injection nozzle will cause a higher than normal fuel flow indication Signup and view all the answers

What is the purpose of a manifold pressure gauge?

To indicate absolute pressure in the intake manifold Signup and view all the answers

Where is the turbine discharge pressure indicator sensor typically located in a turbine engine?

Immediately aft of the last turbine stage Signup and view all the answers

What is an indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine known as?

Bootstrapping Signup and view all the answers

What does the engine pressure ratio (EPR) indicate?

The engine's thrust produced Signup and view all the answers

What would be the effect of a plugged fuel injection nozzle on the fuel flow meter reading?

A higher than normal fuel flow indication Signup and view all the answers

What is the primary purpose of a fuel flow meter?

To measure fuel flow rate Signup and view all the answers

Study Notes

Engine Instrument System

Engine pressure ratio is the total pressure ratio between the aft end of the compressor and the aft end of the turbine.

Instrument Conditions

The following instrument conditions are NOT acceptable and require immediate correction: red line missing, pointer loose on shaft, glass cracked, mounting screws loose, leaking at line B nut, will not zero out, and fogged.
A case paint chip is an acceptable condition and does not require immediate correction.

Thermocouple-Type Temperature Indicating Instrument System

A thermocouple-type temperature indicating instrument system requires no external power source.
It usually contains a balancing circuit in the instrument case to prevent fluctuations of the system voltage from affecting the temperature reading.

Thermocouple-Type Cylinder Head Temperature Indicator

The indication on a thermocouple-type cylinder head temperature indicator is produced by a current generated by the temperature difference between dissimilar metal hot and cold junctions.
The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple.

Electric Motors in Electric Tachometers

Direct current, series-wound motors are commonly used in electric tachometers.

Computerized Fuel System (CFS) with Totalizer-Indicator

A computerized fuel system (CFS) with a totalizer-indicator provides indication of fuel flow rate, fuel used since reset or initial start-up, and fuel time remaining at current power setting.

Fuel Flow Meter Indicating System

A plugged fuel injection nozzle will cause a higher than normal fuel flow indication in a pressure type fuel flow meter indicating system.
On a twin engine aircraft with fuel-injected reciprocating engines, a significantly higher fuel-flow indicator reading on one engine likely indicates a faulty fuel nozzle.

Manifold Pressure Gauge

A manifold pressure gauge is designed to indicate absolute pressure in the intake manifold.

Turbine Discharge Pressure Indicator Sensor

The turbine discharge pressure indicator sensor is located immediately aft of the last turbine stage in a turbine engine.

Unregulated Power Changes

An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine is known as bootstrapping.

Engine Pressure Ratio (EPR)

Engine pressure ratio (EPR) is a ratio of the total pressure ratio between the aft end of the compressor and the aft end of the turbine, and indicates the thrust produced.

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Description

Review questions on engine instrument systems, covering topics such as engine pressure ratio and instrument conditions. Designed for powerplant reviewers and enthusiasts.