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Zz EMB-120 Braz > Engines and Props > Flashcards

Engines and Props Flashcards

1
Q

What type of engines does the Braz have

A

PW 118 A

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2
Q

What is the rated power output of engine

A

1800 SHP

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3
Q

How many compressors does the engine have

A

2 Centrifugal compressors

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4
Q

How many turbines does the engine have

A

3
2 x Single stage axial turbines
1 x 2 stage axial turbine

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5
Q

At what point will the starter generator switch over to being generator

A

50% Nh

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6
Q

As well as lubrication what is an additional use of the oil

A

Heat the fuel

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7
Q

Each engine has how many compressor bleed ports

A

2 x Low Px, Station 2.5, 12 o’clock / 2 o’clock

1 x High Px, Station 3, 10 o’clock

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8
Q

On approach with auto-feather armed, if the engine fails will it feather

A

No, conditions not meet
PLA (PWR LVR ANG) greater than 62
Tq greater than 62%

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9
Q

What type of combustion chamber

A

Reverse Flow annular, 14 nozzles

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10
Q

Engine power control is maintained by

A

Electronic Engine Control (EEC) and the Hydromechanical Control unit (HMU)

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11
Q

What controls the fuel flow in the absence of electrical power, EEC failure

A

Hydromechanical Control unit (HMU)

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12
Q

The EEC (Electric Engine Control) is powered by

A

Emergency DC Buses

and b/up emergency Dc buses

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13
Q

The EEC normally what position

A

TO - AUTO

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14
Q

What does the Illumination of the glare shield EEC light indicate

A

Respective EEC failure detected

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15
Q

Oil Pressure Light activates at?

a. Limitations (note 11)

A

40 psid light
40 mins with oil between 40 - 55 only if NH below 75%
(i.e. flt idle)

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16
Q

Condition Lever job is to?
Positions and guards
Min FLT , Taxi

A

RPM
Mechanically connected to PCU, also HMU for shutdown
Fuel Shut OFF / Feather Min RPM / Max RPM
80% Np Min FLt
50% NP Taxi

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17
Q

Power Lever function is to?
Positions and guards
Provides direct control over

A

FLT Ops NH
Mechanically connected to HMU ( Power lever angle (PLA) controls fuel schedule) and electrically to EEC
PCU (for ground Ops in Beta range), controls pitch for fixed Np - taxi(50%Np) and reverse(80.5%Np EEC controlled)
*Controls Low pitch lock schedule PCU

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18
Q

Ignition system
Auto
On
Off

A

Auto - will activate during start sequence and auto disconnect at 50% Nh changing from starter to generator
On - Ignition circuit is continuously energized
Off - De-energized - used for DRY motoring
Clearing fuel after WET start
Lowering T6 after HOT start

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19
Q

Fuel flow to the engine is metered by

A

HMU / EEC

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20
Q

EEC has a Fail____ Function

a. This does what

A

Fixed - sensor fail only, not full EEC fail
Freezes Torque motor to prevent spool backs during T/Off, fix prop pitch
-Active below FL140-

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21
Q

What is the role of the 14K and 10 K switches

A

14 K changes fuel schedule for the HMU passing FL140,
Leans climbing through and enrichens on descent,allows EEC to adjust fuel schedule
If 14K fails passing 10K this switch throws a fault warning

22
Q

EEC control functions activates at

A

25% Nh

23
Q

What props does the Braz have

A

Hamilton Sundstrand 14 RF-9 Commuter Propeller

Constant Speed, reversible, Full Feathering

24
Q

Prop tip clearance

A

18”

25
Q

Normal ops Props max governed speed

A

1300 RPM (range 1300 - 1313)

26
Q

Pitch range

A

-15.0 through to +79.2 - measured at 42”

27
Q

What controls Np?
During ground Ops?
In Flt?

A

In Flight PCU
On the Ground fixed Power lever via the BETA valve
MIN RPM 50% Np / MAX RPM 65%Np

28
Q

What sort of screw is used in governor

A

acme reverse thread screw, changes actuators position to allow oils to flow from different chambers

29
Q

What is pitch lock?

How is it achieved

A

Pitch lock gap

Change of 1% or 2Np closed the gap trapping oil and stopping further reductions in prop pitch

30
Q

What do the BETA lights on glareshield indicate?
In flight
On the ground?

A

In flight FLASHING - primary low pitch stop has failed secondary low pitch stop is working
Normal on GRD

31
Q

What is the BETA valve?

What does it do?

A

In flight controls Low Pitch Back Stop, controls speed governor not allowing prop pitch below established values
Power lever below FLT Idle
Control blade angle for ground Ops, activated when
Commanded directly by Power lever

32
Q

What if the function of the Least select valve

A

Hydraulic Discriminator between Governor section and Over speed governor

33
Q

Prop sync is activated by

A

Switch
Only Operates between 80% - 100& Np
Left prop is master
won’t activate if Np diff greater than 2.5%

34
Q

PCU Oil Pressures

A

Aux Oil tank feed approx 100 psi
Propeller Oil Pump boosts to 780 psi
Aux Pump Px 820 psi for feathering

35
Q

Reverse Valve

A

Controlled by Power lever selects either governor or Beta valve to control prop pitch
FLT Idle up - Governor
Grd Ops - BETA Valve

36
Q

How many Spools does PW118a have

A

3
Low Press
High Press
Power Spool

37
Q

Which spool drives the starter generator start sequence

A

High Press spool

38
Q

What is the purpose of the S Shaped duct in the air induction inlet

A

Inertial separator, removes FOD by bending the airflow

39
Q

How many fuel injector nozzles are there in the combustion chamber

A

14

40
Q

Where is the T6 temp measured

A

Between the 2nd stage turbine and the power turbine

HP Spool and Power Spool

41
Q

How much does the RGB reduce the RPM going to the prop shaft

A

15:1 reduction through 2 stage gearbox, reduces RPM and increases the torque

42
Q

Is the HMU driven by the TMM gearbox (HP spool)

A

No located on it through the fuel pump,

Fuel pump driven by gearbox but HMU not driven by it

43
Q

How is the AUX oil tank (EFP),( electric feather pump reservoir) replenished

A

Automatically filled by oil system when engine is running or being dry motored
Dry motoring, turning starter without adding fuel to spin the engine

44
Q

What safe guards does prop heat have on the ground

A

Will only function when oil press is above 40 psid

Engine low oil pressure switch

45
Q

What does the abort selection on starter switch do

A

Aborts the start by sending an artificial NH 50% to the GCU - this ends the start cycle

46
Q

Is a generator alone sufficient to an engine

A

No, requires assistance from the main battery

47
Q

At what point does pilot introduce fuel during the start sequence

A

Passing NH 10% condition lever moved from Cut Off to Feather

-make sure temp below 200, hot start delay fuel input-Prior to 19%

48
Q

What is the time limits for “light Up” during engine start?

A

10 secs for light Off (T6 begins to rise)

49
Q

Nh Governing Speeds

A

EEC maintains Ground Idle Nh 62%

Flight idle Nh 72%

50
Q

EEC safety features
Nh Overspeed
Nh undespeed

A

Nh under 60% EEC switches OFF

Nh over 103% EEC switches OFF

51
Q

EEC failure, signs and actions

A

EEC lights on GLARESHIELD
System reverts to HMU, resulting in power loss
Add 20% Torque

Zz EMB-120 Braz (6 decks)

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