Powerplant And System Monitoring Instruments Flashcards
The more sophisticated type of stall warning system takes in consideration the following?
- Angle of attack
- flap and, where fitted, slat positions
- Landing gear weight-on position
- Airspeed
The two alpha probes, or angle of attack sensors, fall under what two categories?
- The conical type
2. The vane type
The type of angle of attack detection system that use a cone shaped probe that is at right angles of the airflow, is called?
Conical Probe
The type of angle of attack detection system that makes use of an aerofoil shaped vane, attached to an arm, protruding into the airflow is called?
The vane-type detector
The pressure indication of the manifold is taken at the?
Induction Manifold
Manifold pressure is measured against?
Absolute zero, the pressure in a vacuum.
The EPR probe can be found where?
Facing into the airflow at the engine air intake
Define the EPR?
The Engine Pressure Ratio, or EPR, is the ratio of high pressure (HP) turbine exhaust pressure to Low Pressure (LP) compressor inlet pressure in gas turbine engine.
EPR is directly proportional to?
The thrust produced
A gauge have a sensor connected to a pressure source which transmits pressure data electronically to the gauge, this type of fuel and oil pressure gauge is called?
A remote indicating gauge
A gauge have a line containing the fluid being measured routed directly to the gauge, is called?
A Direct Reading gauge
Fuel pressure gauges usually make use of?
Remote sensing devices
Oil pressure gauges usually makes use of a?
Bourden Tube.
The other name for an RPM indicator?
Tachometer
Gas turbine engine’s RPM will usually be displayed as a?
Percentage
How the mechanical, or magnetic drag tachometer works?
The crankshaft turn a drive shaft at half the crankshaft speed using gears, the drive shaft rotates a series of small magnets inside a copper aluminium drag-cup, the drag caused by the magnets makes the cup turn in the same direction as the magnets with gives us the RPM reading.
How does the Tacho-generator and indicator system work?
The electrical tachometer makes use of a small three-phase AC generator which is driven by the engine gearbox. The output is used to drive a synchronous motor which in turn drives the tachometer in the cockpit.
How does the Tachometer Probe and indicator system work?
This type of system is used on gas turbine engines. It comprises a toothed wheel, called a phonic wheel, that is mounted on the high compression shaft and a probe unit mounted on the case adjacent to the wheel. The probe consists of magnets and a coil, the rotating phonic wheel generates an electrical signal pulse, of which the frequency will be proportional to the engine RPM.
The basic principle of a capacitance fuel gauge system is that the :
capacity of a capacitor depends on the nature of the dielectric in which it is immersed.
Increase and decrease of engine power alters the?
Pressure bellows
Larger aircraft, for gauging fuel, use what principle?
Electrical capacitance of the fuel.
