Turbines 3 Midterm 1

Identify an example of an engine “condition” indicator from the following:

Torque percentage (turboprops)

Exhaust gas temp (egt)

Engine pressure ratio (epr)

Fan speed (turbofans)

Which system is used as a performance indicator on a turboprop engine?

Free (power) turbine speed

Engine pressure ratio (EPR)

Torque oil pressure

Core engine speed (ng)

What action is required if an igniter plug is dropped during installation?

An ultrasound must be performed on the igniter plug

A visual inspection must be completed as per the maintenance manual

The igniter plug must be discarded and a new one installed

A visual inspection must be carried out, followed by sand-blasting the centre electrode to ensure that its clean

Select the fluid that has the lowest viscosity of using compressor bleed air to pressure engine bearing compartments?

Support bearing operation

Prevent oil leakage past the seals

Sprays a fine mist through the oil nozzles for atomization

Aerate the oil to prevent cavitation

As per the diagram, where does unmetered fuel become metered fuel?

High pressure fuel pump

Low pressure fuel pump

Fuel control Unit (F.C.U)

Main fuel shutoff valve (spar valve)

Which fuel system component is operated by the fire handle?

The fuel pressure regulating valve

The fuel flow divider

The spar valve

The engine-driven fuel pump assembly

What procedure must be carried out prior to disconnecting an ignition lead from an igniter on a high energy ignition system?

Test the ignition system to make sure that there is no residual fuel in the combustion chamber

Dry cycle (motor) the engine to remove and residual fuel from the combustion chamber

Ensure that the aircraft is in hangar

Pull the ignition circuit breaker and wait the allotted time as per the maintenance manual

Which air source provides cooling for the HP turbine blades and disks?

Low pressure turbine discharge air

Fan discharge air

High pressure compression discharge air

Cabin air

What procedure must be accomplished prior to carrying out an engine ignition test (firing the igniters)?

Dry cycle (motor) the engine to remove and residual fuel from the combustion chamber

Place the aircraft on jacks to disable the fuel pumps

Disconnect igniter leads from exciter boxes

Pull the ignition circuit breakers

What is the purpose of the low and high pressure turbine active clearance control system?

Help prevent the main engine shaft from warping

Lower the temperature in the turbine section, to increase the engine service life

Optimize tip clearance between the blade and the engine casing

Increase the tip clearance between the blades and engine casing

When would the fuel system spar valve normally be closed by maintenance personnel?

During a wet cycle to check for fuel flow

Whenever there is and upstream fire or overheat, between the fuel tanks and the valve

During engine ground run-ups

When disconnecting a fuel line downstream from the valve

What is the advantage of using a borescope to perform and engine inspection?

The engine does not require disassembly

No experience is required

Repairs can be made through the borescope probe

All of above is correct

What does the acronym SOAP represent?

Spectrometric Oil Analysis Program

Spectrographic Oil Analytical Process

Spectral Organic Analytical Process

Septic Organ Analysis Program

Which procedure can be accomplished to remedy a declining trend in engine performance?

The engine must be removed and sent to overhaul immediately

A high power run with the fuel selected to rich, to burn off deposits in the combustion chamber and turbines

Compressor wash

A hot section inspection must be completed

Which parameter is not recorded for engine trend monitoring?

Engine fuel flow (FF)

Engine pressure ratio (EPR)

Exhaust gas temp (EGT)

Engine compression ratio (EGR)

What does the acronym TBO represent?

Time between overhaul

Time between operations

To be overhauled

Time before overhaul

Which of the following is not a non-destructive testing method for turbine engine inspections?

Ultrasound

Orthoscope

MPI

Eddy current

What procedure would you accomplish if you experience a “hot start” during an engine start?

Move the fuel condition lever to off and motor (dry cycle) the engine

Move the fuel condition lever to odd and discharge the fire extinguisher

Activate (discharge) the fire extinguisher

Continue the start and move the power lever to high power in order to blow out the fire

What is the purpose of using the beta ring puller when removing the Hartzell propeller?

The puller is used to release the propeller spinner pre-load for it removal

It is a part of the lockout (safety) procedure during propeller removal

It feathers the propeller to access the propeller mount bolts

It pulls the beta ring forward to access the propeller mount bolts

What is the purpose of the quick reference handbook (QRH) during and engine run?

It is used to calculate centre-of-gravity and fuel loads

The QRH is the pilot procedures manual fro normal aircraft operations

It is primarily used as a quick reference for checking MEL items that could ground the aircraft

It contains the checklists for abnormal/emergency operating occurrences

What must be done with the fuel nozzles during PT6A hot section inspection?

A flow (spray pattern) check must be accomplished

They must all be replaced with new nozzles

No action is required as the fuel nozzles are only inspected if issues should arise in service

Only a visual inspection must be performed on the nozzles

You have selected start/ignitions switch on the Cessna conquest for an engine start. Which gauge would you reference first to confirm starter engagement (see picture below)?

PROP RPM gauge

Ng RPM gauge

ITT gauge

TORQUE gauge

You are running a Cessna Conquest PT6 engine at high power and experience and engine fire warning in the flight deck. After cancelling the actual warning and throttling back to idle. What is your next course of action?

Activate the fire extinguisher (discharge the bottle)

Move the start/ignition switch to MOTOR Only to blow out the fire

Move the condition lever to the cutoff position to turn off the fuel

Leave the engine operating at idle until the fire is extinguished by the prop wash

How is the Hartzell propeller aligned to ensure proper installation on the engine

There are 2 dowels on the engine flange that align with holes on the propeller flange.

There is no specific procedure to install the propeller on the engine

The zero on the propeller flange must be aligned with the zero on the engine flange scale

The propeller must be aligned horizontally with the engine #1 cylinder at top dead centre of the compression stroke

How often is a PT6A hot section inspection carried out?

During every annual inspection

During every A-check

At ½ T.B.O

It is carried out only if trend monitoring indicates a deterioration of engine performance

What is the purpose of using the propeller protractor?

Checks for propeller blade bend during inspection

Ensurs that the propeller blade arc is correct

Determines the correct propeller pitch angle when adjusting the prop

Measure the #1 cylinder piston positions before top dead center

How is the Hamilton standard propeller that is used in the lab project adjusted?

Adjustment screws on the left asn right sides of the hub assembly

It can only be adjusted during the manufacturing process

Rotating the index pin turn barrel assembly under the hub mount

Stop nuts on the index pin under the counterweight caps

What is the indicated propeller angle reading I the protractor in the picture?

17 degrees

17.3 degrees

18.7 degrees

20 degrees

What type of thrust reversers uses buckets mounted inside the exhaust duct, deflecting the exhaust gases out through cascade vanes when deployed?

Pedal doors

Clamshell doors

Target type

Blocker doors

What is the most common gear arrangement for the internal gearbox on contemporary turbine powered engines?

Bevel gears

Worm gears

Planetary gears

Spur gears

What is the purpose of the combustion chamber fuel drain valve?

Drains all excess fuel in the combustion chamber to another engine

Drains residual combustion chamber fuel after shutdown, to prevent a tailpipe fire or subsequent hot start

Drains all the combustion chamber fuel back into the aircraft fuel tank after shutdown

Used to provide additional fuel to achieve takeoff power

Which statement best describes the term cascading?

The installation of fan reverser panels around the circumference of the engine casing, used to redirect airflow during thrust reverse selection

The pumping action of airflow from high to low pressure zones through the stages of axial flow compressors

The mechanical arrangement of the stators and rotors getting progressively smaller from front to back on axial flow compressors

The progressive closing and opening of the variable inlet guide vanes and stators of axial flow compressors as power is increased and decreased

What is the first course of action taken if you experience a hot start on the Cessna Conquest after the fuel condition lever has been moved to the cutoff position?

Select 'Motor Only' using the start switch.

Select 'Ignition & Start' using the start switch.

Discharge the fire extinguisher.

Continue the start and advance the throttle to high power to cool the engine down.

Which instrument represents the free turbine speed on the instrument panel (see photograph)?

Ng gauge

Torque gauge

There is no instrument that represents free turbine speed.

Prop RPM gauge

Which of the following scenarios would cause you to suspect a tailpipe fire during engine shutdown?

An engine fire warning would be indicated.

Smoke in the flight deck

A rise in ITT while all other engine parameters decrease

A sudden increase in engine torque

Which gauge would you observe after confirming positive fuel flow when selecting the fuel condition lever 'ON' during a Cessna Conquest PT6 engine start (see picture)?

Ng gauge

PROP RPM gauge

ITT gauge

TORQUE gauge

Select a medium that can be used to heat engine fuel from the following ....

Engine oil

Fan discharge air

Hydraulic fluid

LP turbine discharge air

What is the purpose of the red 'pop-out' indicator on some fuel filter housings?

Indicates a filter clogging condition

Identifies when the filter requires its annual inspection

Identifies the type of filter installed

Provides a warning of a leak at the fuel metering valve upstream of the filter

Where is the fuel metering valve physically located?

The fuel pump assembly

The fuel control unit

The fuel flow divider

The P&D (pressurization & dump) valve

What fuel system component receives the throttle lever input

The fuel pump assembly

The fuel control unit

The fuel flow divider

The P&D (pressurization & dump) valve

What does FADEC represent in contemporary engine fuel systems?

Fuel Automatic Digital Engine Control

Fully Automatic Dual Electronic Control

Fully Automatic Digital Electronic Control

Full Authority Digital Engine Control

What is the common name for a fuel nozzle with two concentric spray patterns?

Dual nozzle

Duplex nozzle

Twin nozzle

Double nozzle

The pressurizing & dump valve schedules primary and secondary fuel flow to fuel nozzles. What is its other function?

Add air to the fuel nozzles for proper atomization in the combustion chamber

Boost the pressure from the engine-driven fuel pumps to ensure a positive fuel supply

Provide positive fuel cutoff at engine shutdown, draining fuel from the manifolds

Remove contaminants from the fuel system, prior to entering the combustion chamber

What remedy is applied to reduce the risk of fuel icing and microbial growth?

The use of fuel additives

Draining the fuel tank(s) prior to aircraft fuelling

Borescoping the fuel tank(s) during every C-check

Using Avgas periodically to flush the system

What type of aircraft commonly use Jet A fuel?

Piston-powered aircraft

Military aircraft

Civilian aircraft

Air ships

Referencing the photograph, what is the maximum allowable ITT during an engine start on the Conquest?

1090 degrees C.

1090 degrees F.

725 degrees C.

725 degrees F.

What is the purpose of using fan blade mid-span shrouds shown in the illustration?

Improve airflow between the blades

To provide a positive seal for thermal expansion

Ensure that the velocity of the air leaving the blade is consistent from blade root to tip

Reduce blade flutter

How is the free (power) turbine driven in turboprop and turboshaft engines?

The exhaust (exit) gases from the compressor turbine

The high pressure compressor(s)

The low pressure compressor(s)

The compressor turbine, directly through the reduction gearbox

Which condition would allow a shorter runway length to be used for takeoff?

Higher temperature

Higher humidity

Lower humidity

Lower density

Turbines 3 Midterm 1

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