PP214-5 - Turbine Engine Maintenance and Overhaul test 2

When should the starter disengage?

When the engine reaches self acceleration

Define - Dry motor check

Prime and leak check lubrication system and Make sure it rotates freely

What is the first indication of a successful light off of a turbine engine

An increase in EGT

What should never be used to mark hot section components

Lead pencil, grease pencils, and crayons

Who can perform overhauls?

-Engine Manufacturer

-Approved repair station

Why should the aircraft face into the wind during an engine run?

Faster, smoother acceleration

Which gauge indicates a hot start?

EGT

What is used to pressurize a metal shipping container?

5 PSI of Nitrogen

What is the proper starting sequence for a turbine engine

Starter, Ignition, then Fuel

How is a hung start indicated

Doesn't reach idle

Define a hung start

During start, RPM fails to accelerate to idle

Who publishes the procedures for testing?

The engine manufacturer

Define - wet motor check

Spooling with fuel and without igniters in order to prime and leak check the fuel system

How long can a turbine engine run without oil pressure?

2 minutes

Engine trimming involves a fuel control adjustment to bring the engine to a specific what?

-EPR

-EGT

-Fuel Flow

-RPM

what do we call it when excess fuel ignites during starting and shoots out the exhaust

torching

Define - torching

excess fuel from a no start shoots flames out of the exhaust

What three instruments are monitored during starting?

-EGT

-RPM

-Oil Pressure

Name the good turbine operating techniques

-Operate the engine at less than limits

-Starter ignition and fuel flow at proper RPM

What cockpit indicator is used to determine thrust for a turbojet?

EPR

What do you do for an internal fire?

Cut fuel flow and continue spooling the engine to lean out the flames

What is considered long-term storage

Four months or more

Test procedure usually includes instrument readings at what thrust setting?

-Max continuous takeoff power

-Idle power

what can a hung start cause

Hot start

How do you choose the proper cleaning material or process?

-What it's made of

-Type of special coating

What may need to be done to parts that have been weld repaired

-X-ray inspection

-Pressure test

Define - Spring back / cushion

Max stop on the fuel control is achieved before the throttle hits its max stop

Define - Part Throttle Engine

Develops takeoff power with throttle at less than full forward position

What do we call adjusting the throttle linkage so that the fuel control hits its max power stop before the throttle lever hits its forward stop?

spring back

What do we call engines that make take-off thrust below the full throttle position?

Part throttle

How are parts inspected if they have been cleaned by tumbling?

Mag part inspection

Name the factors taken into account when determining a TBO extension

-Make/Model of engine

-Use of engine

-Experience with an engine

Name the two types of inspections

-Dimensional

-Non-dimensional

Name the precautions for cleaning and handling turbine bearing

-Don't spin dry

-Lint free gloves

-Preserve in oil

-DO NOT grit blast

-Degauze

-Keep split bearings together

-Don't mix halves

-Demag as necessary (special)

Who is responsible for extending the TBO for a turbine engine

-FAA

-Owner/Operator

-Engine Manufacturer

how do you determine if you will replace only the damaged blade or multiple blades

If the blade has the same Moment-Weight as the one being replaced

Name the two methods of balancing

-Static

-Dynamic

What can be done to a rotor in order to achieve balance?

-Weights on bolts

-Special balancing bolts

-Grinding balance ring

-Replace blades

What must be checked during reassembly?

clearances

Will you need to check clearances during reassembly?

Yes

Name the seven steps of overhaul in their proper order

-Disassemble

-Clean

-Inspect

-Repair

-Reassemble

-Test

-Storage

What may need to be done to parts after a welded repair?

reheat treating

Can carbon seals be reused

yes, if it passes inspection

Can you use the thrust rating on the data plate for all engines of that same make, model, and series?

No, ratings all different

Will the RPM for rated thrust on the data plate be the same for engines of the same model and series?

No