Chapter 1- Power Plant Flashcards
What type of Engine is in the A109 and in what class?
Free turbine, turbo-shaft engine in the 500kW class
How many and what are the locations on the engines?
The power plant consists of two engines identified as No1 engine in the LH side and No2 engine on the RH side
What are the 2 main modules of the engine?
Module 1: Reduction gearbox
Module 2: Gas generator and Power turbine
Where are the module identification plates located?
Module 1 has 2 plates, both located at the lower front, upper plate is for the module M01 and lower is for the power plant/engine. Module 2 has 1 located at the 12o'clock/ top rear for the M02
What are the engine performance for ‘one engine inoperative’?
OEI 2.5 min 590kW
OEI continuous 530kW
What is the max time for OEI 2.5min rating for an engine life?
Can be used up for 2.5mins at a time and a max of 15mins over the whole engine life
What is the engine mass with eecu and specific equip?
115kg
Fuel specific consumption at a ref cruise is?
403 grams per kilowatt hour (g/kW.h) at 300kW
How many firewalls are surrounding the engines?
5 - 1 front and 1 rear firewall per engine and a central firewall dividing the 2 engines
What are the 3 main components of module 1?
Rear and front casings
Reduction gear train with power drive
Accessory drive train
(also includes oil tank)
What does the reduction gear train provide?
An output drive for the main transmission drive shaft.
(Also provides a reduction of rotational speed from 44009RPM (power turbine speed at 100%) to 6000RPM (output gear) with CW rotation - the reduction ratio is 7.3:1)
What does the accessory drive train provide?
Driven by the gas generator shaft the drive train provides the mechanical power required to drive the engine accessories
What are the 5 module 1 accessories?
Starter/Gen Fuel pumps Oil pumps Alternator Centrifugal breather
What does the module 2 provide?
The mech energy required to drive the accessory drive train and reduction gear train
What are the 6 main module 2 components?
Air intake Compressor Combustion chamber Gas gen turbine Power turbine Exhaust system
What is the purpose of the air intake?
Directs the ambient air into centrifugal compressor
What is the type of compressor?
A centrifugal single stage compressor
What is the purpose and location of the compressor?
Provides compressed air required for combustion,it is located at the rear of the air intake casing
What is the type of combustion chamber?
An annular, reverse flow type
What does the combustion chamber do?
It burns the air-fuel mix and delivers the burnt gases to the turbine.
What are the two flows divided in the combustion chamber?
A primary air flow mixed with the fuel for combustion
A secondary air flow (diluted) for cooling of the burnt gases.
What is the gas gen turbine type and purpose?
An axial, single stage type.
Transforms kinetic energy contained in the burnt gases into mech power to drive the compressor and engine accessories.
What is the power turbine type and purpose?
An axial, single stage type.
Tranforms the gas energy provided by the gas generator into mech power to drive the reduction gear train.
What does the exhaust system do?
Continues the expansion phase and expels the gases overboard
What are the two engine air systems?
Combustion air
Internal air and tappings
What is P3?
Centrifugal compressor outlet pressure.
What does the internal air flow system do?
Pressurizes the labyrinth seals, cools certain internal parts and provides balancing of forces with air pressure against the discs
What are the 3 external air tapping system used for?
(P3 air is taken from the compressor stage outlet)
Air pressure control signals for the EECU
Air pressure for the HMU acceleration control system
Aircraft services (heating and EAPS)
