Describe a turbojet engine?

Describe a turboshaft engine?

Once a HEIU has been switched off, what is the minimum time for safety that you must wait before touching any part of the system?

Basic Engine Start Circuit: Energising what ?? will allow DC power to H.E.I.U which produces the power for the igniter plug.

Merlin No1 engine starting using an air starter (APU): The engine must be either in accessory drive, or main drive with blades spread and the rotor brake on.

Electrical starters can be configured to perform the dual role of driving the engine for starting and subsequently being driven by the engine to generate electrical power for the aircraft systems.

Engine Starting: The drive shaft of an air turbine starter is permanently coupled to the engine.

Engine Starting: The APU can provide power for both electrical and air starters.

gas turbine engines: This engine is used in rotary wing aircraft:

• A free turbine is used to produce shaft power to drive machinery instead of producing thrust.

VENT

Which of the following is NOT an occasion when it is required to motor the engine without fuel or ignition:

Engine Torque is a measure of the output ______ being developed by the engine. 

A PTIT harness is made up of five dual thermocouple sensors which are electrically connected in series and arranged concentrically at the rear of the combustion chamber.

Aircraft thermocouples are made of two dissimilar metals called

A Compressor Inlet Temperature (CIT) Sensor is an example of a thermocouple.

Thermocouples: The magnitude of the EMF will depend upon the types of dissimilar metals used

The engine start procedure for a Merlin is to start the APU first using battery power:

• The APU is controlled by the?

Select two items:

State A & H

H.E.I.U

State the LT and HT energy levels?

A starter/generator must be connected to the engine through a clutch mechanism which engages at commencement of the start cycle and disengages as the engine reaches self-sustaining speed.

Which of the following is NOT an occasion when it is required to motor the engine without fuel or ignition:

Multiple choice 1 Question 24

The Compressor Inlet Temperature sensor produces resistance value signals proportional to the inlet air temperature which are fed to each ECU to provide cold junction compensation for the thermocouple circuit.

POWER TURBINE SPEED SENSOR (NP):

The sensor is a dual coil magnetic variable reluctance pickup speed sensor which senses the speed of the 76-tooth gear which drives the oil pump

Engine oil pressure and gearbox oil pressure are sensed by oil pressure ________ on the engines and the gearboxes which are displayed in the cockpit.

Thermocouple Operation:

When two wires of dissimilar metals are joined at their ends to form a closed loop and heat is applied to both ends, an EMF is produced