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Contact Phase > Engine > Flashcards

Engine Flashcards

1
Q

engine modules

A

cold section, hot section, turbine section, accessory section

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2
Q

cold section module components

A

inlet partical separator (IPS)
compressor
the output shaft assembly
line replaceable units (LRU)

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3
Q

Inlet Partical Separator (IPS)

A

removes foreign material from the engine inlet air, air passes through swirl vanes, directing air into a rotating pattern.

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4
Q

compressor

A

has five axial stages and 1 centrifugal stage that continuously pressurizes the combustion chamber, cools the hot section components and provides bleed air from three bleed ports at the 5th stage of the compressor case.

one port provides air to the anti ice start bleed valve the other 2 provide air to the pneumatic system and engine inlet anti-ice

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5
Q

Hot section Module components

A

gas generator (GG) turbine
stage 1 nozzle assembly
combustion liner

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6
Q

Power Turbine Section Module components

A

2-stage power turbine
exhaust frame
drive shaft assembly
C-sump housing

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7
Q

The power turbine converts …

A

gas pressure into rotational shaft energy to power the drive train

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8
Q

The seven thermocouple probes measure …..

A

the temperature of the gases between the Ng and Np turbine sections

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9
Q

Accessory Section Module

A 
accessory gear box
Hydromechanical unit (HMU)
pressurizing and overspeed unit (POU)
overspeed and drain valve (ODV)
starter
engine driven fuel boost pump
oil filter
oil cooler
alternator
oil and scavenge pump
IPS blower
fuel filter assembly
chip detector
oil filter bypass sensor
liquid to liquid cooler
oil temperature sensor
fuel pressure sensor
oi pressure sensor
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10
Q

Hydromechanical Unit (HMU)

A

High pressure pump - delivers fuel to the combustion chamber. The high pressure provides a precise spray pattern for good atomization. The vane pump can suction fuel from the fuel cell

Fuel flow metering/scheduling

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11
Q

HMU - Fuel flow metering/scheduling

A

LDS input

ECU/DEC/EDECU

PAS

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12
Q

HMU - LDS input

A

load demand schedule is manually adjusted by collective movements through the LDS. The collective link to this schedule proactively attempts to match engine power output to the main rotor load. This attempt is approximate and must be further adjusted by the ECU/DEC, via the torque motor

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13
Q

HMU - ECU/DEC/EDECU input

A

the torque motor acts as an interface between the ECU/DEC/EDECU and load dead schedule of the HMU. Trimming of the HMU reduces pilot load by electrically keeping Np and Nr constant (Np governing), keeping power output to the main rotor load. This attempt is approximate and must be further adjusted by the ECU/DEC, via the torque motor.

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14
Q

HMU - PAS input

A

maximum power available schedule is set by the PCL through the PAS. The PAS sets the maximum power limits that may never be exceeded by collective movement

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15
Q

HMU - Acceleration/decelaration fuel flow limiting

A

automatic mechanical function that prevents flameout due to rapid power changes. This limits the metering valve movement rate to prevent compressor stalls and engine flame out

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16
Q

PAS override function

A

the pilot may sever the DEC/EDECU to HMU interface by locking out the torque motor. Advancing the PCL to lockout mechanically blocks off the torque motors fuel control passage within the HMU. The three ECU/DEC functions have been locked out.

17
Q

HMU - PAS override function

A

the pilot may sever the DEC/EDECU to HMU interface by locking out the torque motor. Advancing the PCL to lockout mechanically blocks off the torque motors fuel control passage within the HMU. The three ECU/DEC functions have been locked out.

18
Q

HMU - Ng limiting

A

HMU can. mechanically compute/set the max Ng speed or it induces a physical limitation in which the metering valve is full open. Limiting depends on engine inlet temperature

Ng is limited to 103% Ng and in extreme cold conditions, less Ng is allowed. Ng governing may be entered prior to TGT limiting

Ng shutdown is the engine shutdown at 110% Ng to prevent destruction on Ng section and occurs when a mechanical Ng speed sensing mechanism stops all fuel to the engine when Ng speed reaches 110%

19
Q

HMU other non fuel flow functions

A

Variable geometry positioning - varies the angle of attack of the inlet guide vanes

Vapor vent valve - allows pilot to manually prime the fuel system passages from the fuel cell to the HMU.

20
Q

Overspeed and Drain Valve - ODV

A

controls the sequencing of fuel for the engine, fuel purge functions, and also the flow schedule for overspeed protection

21
Q

ODV Functions

A

sequences fuel through the main fuel manifold to the injectors for starting acceleration and engine operation

Purges fuel from the main fuel manifold on shutdown to prevent coking

It shuts off fuel flow to prevent an engine overspeed when the overspeed system is sensed by the DEC

Shuts off fuel to prevent hot starts when activated by the hot start preventer (HSP)

22
Q

Engine Alternator

A

supplies AC power and support all essential engine electrical functions. The alternator contains three separate sets of windings for its three functions

23
Q

Alternator functions

A

Ignition exciter power

Ng signal to the cockpit

provides power to the ECU

24
Q

Alternator Lost/Disabled

A

Ng signal is interrupted, loss of cockpit indications

ENG OUT warning and audio (Ng is <55%)

25
Q

Complete loss of Alternator

A

No loss of cockpit indications % RPM 1 or 2, TRQ%, because of DEC/EDECU

ENG OUT warning and audio will occur

Overspeed protection is still available

26
Q

HMU - PM CAN VETO

A

Pumps fuel at high pressure

Meters fuel in response to PAS, LDS, ECU (TQ motor) & engine variables

Collective pitch compensation through the LDS. When collective is moved, Ng is reset for immediate Np response

Acceleration/Deceleration fuel flow limiting prevents compressor stall and flameout

Ng limiting. Limits MTA @ low temps

Variable geometry positioning of the inlet guide vanes for optimum performance

ECU lockout. PAS override control w/ ECU ions. Pilot can bypass TQ motor inputs

Torque motor to trim Ng output. fine tune engine output. Override through lockout

Opens vapor vents for manual HMU priming, to remove air from HMU

27
Q

Engine Alternator - INE

A

Ignition power to the exciters during start

Ng signal to the cockpit

ECU power

28
Q

ODV - HOPS

A

Hot Start Preventer. Tells ODV to shut off fuel when TGT reaches 900C (Ng < 60%, Np < 50%)

Overspeed Protection (Np) From DEC @ 120% +/- 1%

Purges main fuel manifolds and allows back flow of high-pressure air for purging

Sends fuel through manifold to injectors for starting and operation

Contact Phase (7 decks)

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