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HAC Study ft. Big Daddy SPOONS > Ch. 2 The Engine > Flashcards

Ch. 2 The Engine Flashcards

1
Q

What type of Engine do we have?

A

T700-GE-401C

Front-Drive Turboshaft Engine

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2
Q

What are the Sections of the Engine?

A

Inlet
Compressor
Combustor
Turbine
Exhaust

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3
Q

Compressor Section

A

5 stage axial
1 stage centrifugal
Rotor stator assembly

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4
Q

Combustion Section

A

Flow-through, annular combustion chamber.

2 igniters
12 injectors

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5
Q

Gas-Generator turbine

A

Ng turbine drives the compressor and AGB.

2 stage, air cooled, high performance, axial design.

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6
Q

Power Turbine

A

Np turbine has 2 stages that turn the power turbine drive shaft.

Shaft is coaxial turning inside the Ng driveshaft, extending through the front of the engine where it connects to the high speed shaft to the input mod.

TGT is sensed between Ng and Np turbines

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7
Q

Engine Air Flow

A

30% for combustion

Remainder for:
1. Compressor inlet temp (T2)
2. Compressor discharge pressure (P3)
3. Combustor turbine cooling
4. Engine oil seal pressurization

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8
Q

AGB Driven by?

Front Face?

Rear Face?

A

Driven by a radial drive shaft from the Ng turbine.

Front face provides drive pads for the alternator and engine driven boost pump.

Rear face provides drive pads for engine starter, HMU, IPS blower and ODV

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9
Q

LDS Operation

A

With the PCL in FLY, the HMU responds to collective position through the LDS to automatically control ENG speed and provide required power.

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10
Q

ENG Driven Boost Pump

A

Mounted on the forward side of the AGB

  1. Provide reliable suction feed from the fuel tank to the engine,
  2. Provide discharge pressure to satisfy the minimum inlet pressure of the HMU
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11
Q

Fuel Tapped From the HMU for the following

A
  1. Positioning a metering valve to ensure proper fuel flow to the engine
  2. Positioning a servo piston that actuates the variable geometry vane servo and start bleed valve.
  3. Amplifying signals (T2, P3, Ng) that influence fuel flow.
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12
Q

HMU receives cockpit inputs and responds to PCL for?

A
  1. Fuel shut off
  2. Setting engine start fuel flow
  3. Setting permissible Ng up to maximum
  4. Fuel priming
  5. EDECU LOCKOUT
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13
Q

HMU Provides

(RANNAF)

A
  1. Rapid engine transient response through collective compensation
  2. Automatic fuel scheduling for start
  3. Ng overspeed protection
  4. Ng Governing
  5. Acceleration Limiting
  6. Flameout and compressor stall prevention
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14
Q

ODV 4 Main Functions

A
  1. Provides fuel to 12 injectors
  2. Purges the fuel manifold overboard after engine shut down
  3. Traps fuel upstream keeping the fuel oil heat exchanger full
  4. Returns fuel back to the HMU if the Np overspeed is energized or EDECU hot start prevention
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15
Q

Engine Limiting?

A
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16
Q

Windings of the alternator?

A

Provides AC power to
1. Igniter assembly
2. EDECU
3. Ng signal to the VIDS

17
Q

16 Functions of the EDECU

4N(+A), 4C, 3E (last 4)

A
  1. Ng decay relight feature
  2. Np Governing
  3. Np Over Speed Protection
  4. Np Overspeed Test
  5. Auto Ignition
  6. TGT Limiting
  7. Manual C-PWR
  8. Auto C-PWR
  9. Dual ENG Auto C-PWR
  10. Engine Load Sharing
  11. Engine Speed Trim
  12. EDECU Lockout
  13. Cockpit signals
  14. Hot Start Prevention
  15. TDI
  16. Fault Diagnostics
18
Q

Np Governing

A

Np sensor located on the left side of the power turbine and provides signal to the EDECU. Actual compared to reference

19
Q

Np Over speed Protection

A

Actuated at 120% - ODV diverts fuel to the inlet of the HMU, causing flame out

20
Q

TGT Limiting

A

When TGT approaches 878 ( 866 +/- 10)(MRP), EDECU prevents further fuel flow increase. If more is demanded Np/Nr will droop.

21
Q

Engine Load Sharing

A

Torque matching system operates by increasing the lower engine torque while not directly effecting the higher engine

22
Q

Engine Speed Trim

A

INCR / DECR switch controls both engine Np at the same time. Provides EDECU with reference Np between 96 -101

23
Q

Manual C-PWR

A

TGT limit increased to 903 limit (891 +/- 10) (CRP Cont. Range Power)

With the switch flipped you will get #1/#2 C-PWR on advisory

24
Q

Auto C-PWR

A

TGT limit increased to 903 limit (891 +/- 10) (CRP Cont. Range Power)

Enabled in OEI conditions

When the torque from one engine is below 50% the opposite engine EDECU will automatically reset the TGT limiter

No advisory

25
Q

Np Over Speed Test

A

A & B buttons simultaneously resets Np overspeed limit to 96%.

If Ng decreases when either button is depressed individually, the opposite button is faulty.

25
Q

Dual Engine Auto C-PWR

A

TGT limit increased to 903 limit (891 +/- 10) (CRP Cont. Range Power)

One or more of the following must exist:
1. Np drops below 96%
2. Greater than 3% droop between ref. Np and actual Np
3. Greater than 5% per second Np droop rate exists with Np less than or equal to Np ref.

No advisory

26
Q

EDECU LOCKOUT

A

PCL can manually control Ng and Np.

Engine power set by LDS and PAS only

Deactivating TGT limiting, Np Governing and load sharing.

The Np over speed protection is retained

27
Q

Cockpit signals

A

Provides Np, TGT and Torq signals to the DTC for cockpit display

28
Q

Hot Start Prevention

A

Detects a hot start when TGT exceeds 900 with Ng below 60% and Np below 50% and automatically secures fuel flow by tripping ODV.

Restored when TGT below 300 or after 25 seconds

Can be disabled buy pressing and holding OVERSPEED TEST A or B button for duration of start sequence.

29
Q

TDI

A

Designed to initiate power turbine acceleration early by using anticipator from the TDI Nr sensor located in the LEFT ACCESSORY MODULE and a collective positioning sensor in the mixing unit.

30
Q

Auto-Ignition

A

When Np overspeed condition exists (or during overspeed test) the ignition sequence is automatically initiated for 5 seconds to relight the engine.

31
Q

Ng Decay Relight feature

A

If an engine flames our for any reason and exceeds a specified Ng decel rate, the auto ignition system will turn the igniters on for 5 seconds to attempt to relight the engine.

Disabled below 62% Ng

32
Q

Fault Diagnostics

A

Fault codes are displayed numerically on the ENG torq indicator with a brief description in text below the vids

4 seconds on 2 seconds off

can be suppressed and recalled with ENG OVSP test buttons

33
Q

3 Ways to ANTI ICE Engine

A
  1. Vent bleed air into the engine swirl vanes and inlet guide vanes
  2. Vent bleed air into the airframe engine inlet by the engine anti ice valve.
  3. Continuously pump engine oil through the scroll vanes
34
Q

Malfunctioning Engine Anti-Ice

A
  1. Appearance or disappearance of the ENG ANTI-ICE on advisory when outside the specified range
  2. No appearance of ENG ANTI-ICE ON advisory with switch selected on
  3. No rise in TGT when ENG ANTI ICE switch selected on
35
Q

Eng Anti-Ice/Start Bleed Valve

A

5th stage bleed air for anti ice and to prevent compressor instability during starts.

Open below 80.5% Ng
Closes above 96.5% Ng unless selected on or electrical power is lost

36
Q

ENG Inlet Anti-Ice

A
  1. Less than 4C the valve is open and advisory appears when temp reaches 93C
  2. Between 4C and 13C the valve is controlled by Freon-filled bellows. They begin closing at 4C and should be completely closed at 13C
  3. Above 13C the valve is closed and the advisories will extinguish when inlet cowling temp is below 93C

Appearance of INLET ANTI-ICE ON advisory when oat is above 13*C is and indication of a malfunctioning valve.

37
Q

TGT Sensing

A

The thermocouple harness consists of SEVEN thermocouples for measuring TGT.

Joined in parallel and provide an average.

Biased -71*C

Without ENG OVSP CB the bias will be absent.

HAC Study ft. Big Daddy SPOONS (34 decks)

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