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Dash 8 Q400 > Engines and Propellor > Flashcards

Engines and Propellor Flashcards

1
Q

SHP RATING

A

4,580SHP

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2
Q

Type

A

PW150A

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3
Q

FADEC?

A

Full Authority Digital Engine Control

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4
Q

What drives accesory gearbox

A

High pressure compressor

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5
Q

What supplies power to FADEC in each engine and also the APU

A

Right Essential Power Bus powers APU FADEC

Respective PMA’S power each engines FADEC

FADECS are secondarily powered by the essential buses

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6
Q

When does FADEC become operational

A

20% gas generator speed

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7
Q

How many FADEC channels

A

2

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8
Q

MAX RPM

A

1020RPM

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9
Q

MAX Power available

A

125% T/O RATING POWER

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10
Q

MTOP

A

Maximum Take off Power

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11
Q

NTOP

A

Normal Take off Power

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12
Q

UPTRIM

A

Power loss engine’s PEC sends signal to FADEC of operating engine to increase to MTOP and increase power by 10%

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13
Q

Moving Power Levers into Overtravel region does what to prop RPM?

A

Automatically increases to 1020RPM regardless of Condition lever position

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14
Q

TORQUE LIMITS

A

Reverse - 35%
Forward - 106%
Overtravel - 125%
Feathered - 135%

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15
Q

What is the propellor Underspeed governing speed?

A

Prop speed - 660RPM

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16
Q

How does the Nh overspeed correct and when?

A

FADEC restrics fuel flow if 108% is exceeded

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17
Q

What are the three fault classifications

A

Critical
Cautionary
Advisory

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18
Q

Critical Failure definition

A

Detects faults which result in stabilizing the engine at FLT IDLE or GND IDLE, depending on airspeed or air/gound status
A commanded engine shutdown
FADEC signals illumination of the #1 or #2 ENG FADEC FAIL warning Light

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19
Q

Cautionary Fault definition

A
  • Detected faults involving asymmetric Power Lever position or rapid Power Lever movement resulting in engine surge
  • FADEC signals illumination of #1 or #2 ENG FADEC Caution Light
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20
Q

Advisory Fault Definition

A

Advisory faults are detected not classified as critical or cautionary. FADEC transmits Advisory fault codes to the engine monitoring unit and engine display

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21
Q

How many ignitors per engine

A

2

22
Q

How much oil in oil tank

A

6 QTS check within 15-30mins of shutdown

23
Q

What PSI triggers low oil pressure annunciation

A

<47psi

24
Q

When do you introduce fuel in an engine start

A

Once the NH begins to rise

25
Q

When is starter cycle complete

A

50%NH

26
Q

When does FADEC abort start

A

Light off doesnt occur within 16 sec of fuel flow introduction
ITT limit of 920 deg C is exceeded
NH does not reach 50% in 70 sec

27
Q

What happens after FADEC aborts start

A

Select switch auto centers

START caption in the START Switchlight extinguishes

28
Q

What is difference for starting in in-flight starts

A

Both ignitors are used
Auto Abort features are disabled
FADEC doesnt monitor ITT

29
Q

Indicated TRQ range

A

0-199%

30
Q

Indicated PROP RPM Range

A

0 - 1990RPM

31
Q

ITT value Range

A

-99 - 1,999 deg C

32
Q

MCP

A

MAX CONTINUOUS POWER

33
Q

MCL

A

MAX CLIMB POWER

34
Q

MCR

A

MAX CRUISE POWER

35
Q

What prop RPM is MCR available at

A

850 or 900 RPM

36
Q

NH range

A

0 - 199.9%

37
Q

NL range

A

0 - 199%

Low pressure turbine speed

38
Q

Oil temp range

A

-99 - 199 deg C

39
Q

Oil Pressure range

A

0 - 299 PSI

40
Q

Normal oil pressure range

A

40 - 80 PSI

41
Q

MCR

A

Changes engine rating when condition levers are set to MIN/850 from MCR to MCL

42
Q

MCR

A

Changes engine rating when condition levers are set to 900 from MCL to MCR

43
Q

alternative way to feather prop?

A

ALTERNATIVE FEATHER pump 28VDC

44
Q

Prop Gnd range is below what blade angle?

A

16deg

45
Q

When is autofeather armed?

A 
TRQ > 50 %
A/F ON
PLA > 60%
Condition levers set to max/1020RPM
engines running
Displayed on ED
46
Q

The Automatic Takeoff Power Control System (ATPCS) AKA “Uptrim” is triggered by what four conditions?

Is it dependent on Autofeather selection??

A

Torque of the failed engine falls below 25% “OR”
Np falls below 816RPM &
PLA is set to high &
MTOP is not set

It is independent of the autofeather system.

47
Q

How to disarm autofeather

A

Other engine fails
Pushing switch off
Retarding PWR LVR to FLT IDLE
remote prop autofeathering

48
Q

when does AUPC (automatic underspeed propeller control) activate

A

propeller speed <816RPM

49
Q

How is the propeller overspeed governing accomplished?

A

Hydraulically at 1060RPM by stopping the HP oil supply to the hub and allowing the counterweights to coarsen the pitch.

Electrically at 110% or 1120RPM by the FADEC signaling to reduce fuel through the Fuel Metering Unit

50
Q

How is the Nh protected from over speeds?

When is it used in normal operations?

A

The FADEC issues a dual channel signal to the fuel shutoff solenoid when the Nh signal reaches 108%.

It is used to shut down engines in normal operations.

Dash 8 Q400 (23 decks)

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