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EMB 120 > Powerplant > Flashcards

Powerplant Flashcards

1
Q

What engines does 120 have

A

PW118, A, B

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2
Q

What is the difference in the engines

A

A and B have better performance

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3
Q

What kind of props does the 120 have

A

Hamilton Sundstrand 14rf-9
4 blades 10.5 ft diameter

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4
Q

How many compressors does each engine have

A

2 centrifugal compressors

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5
Q

What is TMM and what is run my TMM

A

Turbo machinery module
1. Starter/generator
2. HMU
3. Oil pump
4. Fuel pump

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6
Q

What is HMU

A

Hydrotechnical Metering Unit. The mechanical fuel, it takes inputs from different systems and creates fuel schedule

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7
Q

What is RGB and what is run by RGB

A

Auxiliary Gen
Hydraulic pump
Axillary Feater pump

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8
Q

What is RGB and what is run by RGB

A

Auxiliary Gen
Hydraulic pump
Axillary Feather pump
PCU oil pump
Overspeed governor
PCU

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9
Q

What is PCU

A

Propeller Control Unit
Primary governor
Controls prop pitch and speed

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10
Q

Are the compressors and power turbine connected

A

No the compressor section creates enough airflow to the combustion section to sustain continuous combustion. The turbine section converts energy form the expanding gasses exiting the combustion chamber in to rotational force used to drive the compressor, propeller, and accessories

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11
Q

Do turbines spin in different direction

A

Yes to prevent torque effect

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12
Q

How much HP is the engine rated for

A

18000 SHP

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13
Q

Roughly how much air is used for cooling and combustion

A

About 75% for cooling and 25% for combustion

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14
Q

What kind of oil system does the engine have

A

Pressure system

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15
Q

How much oil can the system hold

A

2.4 Gal

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16
Q

Is the oil pressure gage and the oil light connected

A

No

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17
Q

How many fuel nozzles does each engine have

A

14 that produce continuous flow of fuel

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18
Q

How many igniter does the aircraft have

A

2

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19
Q

What is a Hot start

A

When either too much fuel or not enough air. T6 raises very rapidly

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20
Q

What is a Hung start

A

A hung start is a start that begins but doesn’t finish properly

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21
Q

What is EEC

A

Electronic Engine Control - takes fuel information form the HMU and other engine inputs and fine tunes the HMU fuel scheduling

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22
Q

Functions of EEC

A
  1. Idle speed governing
  2. Np fuel governing
  3. Acceleration/Deceleration control
  4. Fixed torque climb
  5. HMU de-enrichment
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23
Q

What happens at 14,000 ft

A

When climbing through 14,000 ft the fuel gets too rich for EEC so HMU de-enriches the fuel schedule so the EEC can properly utilize the fuel schedule. When descending back trough 14,000 ft the HMU will re-enrich the fuel schedule. If re-enrichment doesn’t happen you will get a tipple chime and “ENGINE CONTROL”

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24
Q

What is the ax RPM for the Propeller

A

1300 RPM

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25
Q

How much oil is in the AUX tank

A

0.3 gallons enough to go to full forward to full feather once. If the engine is spinning it will re-fill itself

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26
Q

Explain how the propeller works

A

The PCU is commanded by Power lever and Condition levers. When a pitch change is commanded, the PCU changes the rotational speed of the transfer tube (normally rotates the same speed as the prop) either faster or slower than the prop speed. This speed change is obtained by 2 distinct oil pressures; supply and control. The supply pressure actuates to increase pitch and control pressure actuates to decrease pitch. When the transfer tube speed is increased or decreased it opens 1 or 2 chambers. When oil enters either chamber it move the actuator piston witch then changes the pitch of the blades

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27
Q

What condition must be met for auto feather to work

A

Switch to on
PLA grater than 62°
Tq of both engines must be above 62%

28
Q

Why prop sync have to be off during takeoff

A

Because the left engine is the Master and the right engine is slaved to the left, so if the left engine would have failed the right engine would try to match the Np of left engine

29
Q

How close the props have to be for prop sync to work

A

2.5%

30
Q

How any turbines does the engine have. How many power turbines

A

4 turbines total, 2 power turbines

31
Q

What should be Ground and Flight idle Nh with EEC ON

A

Ground 62%
Flight 72%

32
Q

What happens if EEC fail below 14,000 ft

A

They fail fixes at whatever schedule they are in

33
Q

What is the flight idle stop and how does it work

A

Prevents the power levers from going into reverse while in flight. A weight on wheels switch removes the block on the ground

34
Q

When is prop heat available

A

Oil pressure 40 psi

35
Q

What ways can the prop be feathered

A

Manually
Electrically
Auto feather
Fire T handle

36
Q

What is the low pitch secondary stop

A

If primary pitch stop fail the props will keep propeller at around 12.6° thus prevents then form going into reverse

37
Q

What could be a reason for beta light in flight

A

Surging prop

38
Q

What keeps the prop at selected speed

A

Primary speed governor, uses flyweights

39
Q

Explain how the overspeed governor takes over

A

The least selector valve chooses the lowest pressure between the primary governor and overspeed governor. The primary governor has lower pressure then the overspeed governor in normal operations. If the normal speed governor fail, the pressure will increase making the overspeed governor oil pressure the lower of the two. The least selector valve will then choose the overspeed governor

40
Q

What Nh will the overspeed governor try to keep the prop in

A

103%

41
Q

What if overspeed governor cant maintain 103% Nh

A

Fuel topping governor will reduce amount of fuel to the combustion chamber keeping Nh at 107%

42
Q

What happens if the prop system looses oil pressure

A

Fixed pitch prop. Prop is driven toward flat pitch until it closes pitch lock gap which keeps the prop fixed

43
Q

Engine power control is accomplished by operation of

A

A combination of the EEC and HMU

44
Q

The device that provides essential fuel control in the absence of electrical power

A

HMU

45
Q

The EEC normally is used in what position

A

TO or ON

46
Q

If EEC light on the glareshield illuminates, this indicates

A

An electrical failure exists in the system

47
Q

Minimum oil temperature for takeoff

A

45°

48
Q

Oil pressure alarm light will illuminate at

A

40 PSID

49
Q

The PW118 combustion section is defined as

A

Reverse flow annular combustion

50
Q

Power lever provides direct control to

A

HMU

51
Q

During engine start with ignition system set to AUTO

A

The ignitors come on automatically
The ignitors go off automatically

52
Q

What indication does the pilot have to indicate the engine ignitors are energized

A

A white ignition light

53
Q

After initiation a start cycle automatically interrupted at approximately

A

50% Nh

54
Q

Engine oil is also used for

A

Fuel heating

55
Q

Fuel flow to the engine is metered by

A

HMU/EEC

56
Q

The EEC has a function called

A

Failed fixed

57
Q

EEC control functions are activated at

A

25% Nh

58
Q

In normal operation, maximum governed propeller speed is

A

1290-1309 RPM

59
Q

Normal operation range for a propeller

A

79.2°(feather) to -15°(reverse)

60
Q

In flight Np is controlled by

A

PCU

61
Q

The main component for changing propeller pitch

A

Propeller servomechanism

62
Q

During taxi and reverse witch unit controls Np

A

PCU

63
Q

Which control input sets the speed for a prop governor

A

Condition levers

64
Q

When in BETA range

A

The speed governor no control of propeller pitch

65
Q

Beta valve position is adjusted by

A

Power levers

66
Q

Will the propeller feather atomically in flight if it has not fathered after an engine failure

A

No

67
Q

Propeller sync is activated by

A

System on and Np > 80%

EMB 120 (22 decks)

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