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64 SYSTEMS > Engines > Flashcards

Engines Flashcards

1
Q

The engine is divided into four modules:

A

cold section, hot section, power turbine section, and accessory section

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2
Q

Cold section

A

(a) Cleans
(b) Directs
(c) Then compress the air
(Suck/Squeeze)

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3
Q

Hot Section

A

mixing of fuel and air for combustion

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4
Q

Power Turbine section

A

Extracts energy from hot expanding gases and converts it to mechanical energy (shaft horsepower)

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5
Q

Accessory Section

A

provides for engine-driven accessories and engine starting.

accessory section module is driven by the radial driveshaft

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6
Q

ATS

A
  1. Rotates the compressor until self-sustaining (52% Ng)
  2. PRSOV regulates air from IPAS to ATS (Pressure regulating shutoff valve)
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7
Q

Engine Fuel Boost Pump

A

Engine-driven, non-self-priming suction and pressure pump

Suction ensures that fuel supply system is under negative pressure, reducing danger of fire in case of fuel system damage

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8
Q

Common Hydromechanical Unit (CHMU)

A

The CHMU provides metered fuel, fuel pumping, flow computation, pressurization, fuel shutoff

Ng overspeed protection (mechanical) at 110±2% Ng, results in flameout

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9
Q

ODV

A

In normal operation it Provides fuel to the 12 fuel injectors

Np overspeed protection (electrical) at 118.1±1% Np from EDECU (activates the overspeed solenoid valve on the ODV, shutting off fuel from the ODV to the injectors and re-routing it to the CHMU, causing flame out)

fuel injector draining upon shutdown

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10
Q

Ignition System

A

Each engine has an ignition exciter unit with two igniter plugs. The exciter unit re-ceives power from its engine alternator.

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11
Q

3 windings of the alternator

A

(1) The engine-driven alternator supplies 115 Vac for the engine electrical system.
three windings providing power for:
(a) Engine ignition
(b) Ng speed indication
(c) EDECU

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12
Q

2 overspeed protections

A

NG mechanical (CHMU 110 +/- 3)
NP digital (ODV 118.1 +/- 3)

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13
Q

Enhanced Digital Electronic Control Unit (EDECU)

A

The EDECU controls the engine and transmits information to the crew.

MTRA
OVERSPEED PROTECTION
Transient droop improvement
TGT LIMITING
TQ MATCHING
HOT START PREVENTION
FAULT CODES

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14
Q

Maximum Torque Rate Attenuator (MTRA)

A

Reduces the risk of exceeding DE torque limits during uncompensated maneuvers.

These are any maneuvers where pedal or cyclic inputs are made but no collective control input occurs.

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15
Q

Engine Chip Detector

A

The chip detector attracts metal particles that may be present in the Engine Oil System.

The chip detector consists of an outer shell with internal magnet, electrical connector, removable screen and has no fuzz suppression (burning-off) capabilities.

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16
Q

Yellow wire

A

Yellow harness supplies power and control system trim signals

17
Q

Blue Wires

A

overspeed and torque signals

18
Q

Green Wires

A

Green harness conducts engine condition monitoring (crewstation instrumentation)

19
Q

The engine alternator has three windings providing power for:

A

(a) Engine ignition
(b) Ng speed indication
(c) EDECU

20
Q

Engine Chop Control

A

The guarded Chop (CHOP) button on the flight grip of the collective provides a means to immediately and simultaneously reduce both engines electronically to idle.
After pressing you must reduce power levers to idle or else the engines will go back to fly.

21
Q

PAS

A

Power available spindle: The PAS is mechanically connected to the pilot’s power levers

converts push-pull motion at the POWER levers to rotary motion at the CHMU input shaft.

22
Q

LDS

A

Converts push-pull motion at the collective lever to rotary motion at the CHMU input shaft.

Load demand spindle is connected to a bellcrank attached to the collective servo.

23
Q

Black cable

A

Ignition

24
Q

Air Turbine Starter:

A
  1. Rotates the compressor until self-sustaining (52% Ng)
  2. PRSOV regulates air from IPAS to ATS
25
Q

Power Available Spindle

A

provides power lever input (on CHMU)

26
Q

Load Demand Spindle

A

provides collective load demand input (on CHMU)

27
Q

Components of Accessory section

A

Starter
CHMU
Chip detector
ATS
APS
Alternator
Fuel pump/filter
ODV

28
Q

Components of electrical

A

Eedecu
Thermocouple harness assembly
History recorder
Alternator
Np, Torque, and Overspeed Sensors

Engine Anti-Ice/Start Bleed Valve

29
Q

CHOP Button

A

immediately and simultaneously reduces both engines electronically to idle

30
Q

Lockout

A

Overrides EDECU, disables EDECU auto fuel metering

31
Q

What will the crewstation lose if the alternator fails?

A

NG indication

32
Q

The cold section is made up of what?

A

Inlet
Compressor
Diffuser

33
Q

Pressing Firebutton

A

Arms the fire ext system
Fuel shut off xfer valves
Bleed air off PRSOVS
Louvers
Voice stops
Warning message stops

34
Q

TQ Sharing System

A

The torque-sharing system increases power on the lower-output engine to match it with the higher output engine.

35
Q

TDI

A

Transient Droop Improvement:
Prevents NR Droop during collective applications

64 SYSTEMS (13 decks)

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