Q400 > Engines - Propeller System > Flashcards

Engines - Propeller System Flashcards

(115 cards)

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1
Q

Engine type?

A

Pratt and Whitney PW150A

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2
Q

Propeller type?

A

Dowty R408

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3
Q

SHP? NTOP, MTOP

A

NTOP 4580 SHP
Auto uptrim after EF 5071 SHP on one engine MTOP

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4
Q

3 stage low pressure axial compressor air is displayed as?

A

NL

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5
Q

Second stage of compression is the high pressure centrifugal compressor which is displayed as?

A

NH

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6
Q

Two igniter plugs in the combustion chamber do what?

A

Used for initial ignition during engine start

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7
Q

What are the compressors driven by?

A

Single stage turbines

(NH turbine and NL turbine)

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8
Q

What drives the Reduction gear box?

A

Power turbines (NPT)

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9
Q

Reduction gear box transmits power to drive the?

A

Propeller

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10
Q

Where is the starter/ generator mounted?

A

Accessory gear box

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11
Q

What is the starter generator switch over?

A

50%

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12
Q

Components driven by accessory gearbox?

A

Fuel metering unit
Permanent magnet alternator
Oil pressure scavenge and pumps

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13
Q

What is driven by the reduction gearbox?

A

AC generator
Engine driven Hydraulic pump
propeller pitch control unit (PCU)
Propeller overspeed governor
Alternate feathering pump

(ACHOPA)

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14
Q

Power lever position?

A

RATING

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15
Q

When is FADEC used?

A

Forward and reverse ranges

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16
Q

In BETA range power levers control the?

A

Propeller blade angle using the Propeller Electronic Control (PEC)

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17
Q

Power levers forward of the RATING detent does what to the toque and propeller speed?

A

FADEC linearly increases engine power from rated power to 125% of MTOP
Cause the props to set 1020RPM

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18
Q

Flight idle gate purpose?

A

Prevents moment into the ground beta range

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19
Q

When in DISC the prop blades are at what angle?

A

0 degrees

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20
Q

Do not use max reverse thrust under what speed?

A

60KIAS

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21
Q

Reverse speed control for the prop is between?

A

660 and 950RPM
Max 1020RPM

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22
Q

Condition levers have two main purposes?

A

Introduce and terminate fuel flow during engine start and shutdown
& control propeller RPM

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23
Q

Condition lever positions? 5

A

MAX1020RPM
900RPM
MIN 850 RPM
START AND FEATHER
FUEL OFF

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24
Q

Condition lever set to max does what?

A

Provides an engine rating of NTOP

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25
Conditions levers at 900RPM and power levers in rating detent provides?
MCL max climb power
26
Condition levers at MIN850 and power levers at rating provides?
Maximum cruise power (MCR)
27
Fuel metering unit (FMU) driven by?
Accessory gearbox
28
FMU controls fuel based on demands from?
FADEC
29
How many FADECs in the AC?
One on each engine
30
FADEC also controls what valves?
Handling bleed off valves (HBOV)
31
Propeller underspeed governing limits prop speed to?
A minimum 660RPM (Np) in the air and on the ground with the condition overs forward of start & feather
32
FADEC prevents an engine overspeed by?
Cutting off fuel if NH exceeds 108%
33
FADEC prevents engine torque limits exceeding what?
Reverse 35% Forward range 106% Over travel range 125%
34
Spurious propeller feathering at a high power setting what will FADEC do?
Rapidly reduces NH preventing torque from exceeding 135%
35
What controls engine start and shutdown sequence?
FADEC
36
FADEC critical fault results in?
The engine stabilising at FLIGHT IDLE or The engine automatically shutting down
37
#1 or 2 ENG FADEC FAIL warning light?
FADEC critical fault
38
FADEC cautionary fault results in?
Asymmetric power lever positions for symmetrical power or Engine surge from rapid power lever movement
39
#1 or 2 ENG FADEC caution light?
FADEC cautionary fault
40
FADEC advisory fault?
Not critical or cautionary just needs maintenance prior to next flight
41
Source of power for FADEC?
Permanent magnet alternator (PMA) above 20% Nh ESS BUS for Engine starting or PMA failure
42
FADEC provides electrical power to?
Propeller electronic control (PEC)
43
Reduced take off power is achieved by?
2% each DEC push (max reduction 10%) On the ED it’ll show the RDC TOP
44
Reset button on REC TOP does what?
Resets to NTOP
45
Reduced NP landing will be what?
850RPM
46
How to set up reduced np landing mode?
Press RDC Np LDG button Power levees between flight idle and half way. Condition levers can then be set to max whilst it remains at 850np (must do within 15 seconds)
47
Automatic take off power control system does what?
Power Uptrim if engine fails
48
Uptrim when taking off at NTOP and RDC what happens?
NTOP goes to MTOP RDC adds 10% to the torque being used
49
Is Arming of ATPCS automatic?
Yes when power lever angles are high and torque is at least 50%
50
If uptrim is detected what will you see?
UPTRIM message on ED in reverse video colours for 5 seconds then reverts to normal video
51
When will uptrim be activated?
Torque falls below 25% or NP decreases below 816RPM or auto feathers
52
How many torque sensors are there and how many need to sense a loss of torque before UPTRIM signal generated?
Two sensors and both must sense the loss
53
How to deactivate UPTRIM?
Moving both power levers below the RATING detent
54
How does the bleed selector effect take off power when not at MIN?
Must be at MIN to allow for uptrim or it will be a very reduced torque for the detent
55
With OEI how can you change to power to MCP?
By selecting NORM or MAX on the bleed air selector
56
When to move the condition lever during engine start?
At first indication of NH move to start and feather
57
After start Engine stabilises at?
64.2% NH
58
What light must be out before starting the second engine?
SELECT push light (takes 15 seconds after the START light goes out)
59
How long can you exceed 880 degrees?
20 seconds
60
What temp must you never exceed for ITT?
920 degrees
61
FADEC auto Eng start abort when?
Light off does not occur within 16 seconds of fuel flow introduction If 920 degree starting ITT is exceeded
62
Will FADEC abort a hung start?
No manual intervention required
63
Cranked starting limits?
70 seconds on 2 mins off 70 seconds on 2 mins off 70 seconds on 30 mins off
64
Air start vs ground start?
Auto abort and ITT over temp features of the FADEC are disabled
65
How does FADEC know if it’s an air start or on the ground?
WOW or 75kts
66
# 1 or 2 ENG OIL PRESS warning light?
Oil pressure below 44psi
67
A/F ARM in reverse video means?
Auto feather is armed on takeoff
68
Fuel flow (FF) shown in?
Kilograms per hour
69
ITT maximum radial line on gauge changes how?
NTOP rating red radial line will display 822-847 depending on temperature and altitude Other ratings 880 Engine start 920
70
Oil temperature scale adjustments occur when and change to? Look at pictures to see colour arc changes
Propeller heat is on 55degrees 65PSI Propeller heat off 65 degrees 65PSI Power levers below idle 55 degrees 65PSI Power levers above idle 55 degrees 65PSI
71
Propeller control system include?
Propeller electronic control (PEC) Propeller oversepeed governor (OSG) Alternate feathering pump Automatic propeller synchrophase system
72
PEC does what?
Controls propeller pitch and speed
73
What safety responses does PEC have?
Autofeather Automatic underspeed propeller control Initiation of UPTRIM command to FADEC
74
Purpose of OSG?
Prevent overspeed if a malfunction occurs
75
Alternate feather pump powered by?
28V DC
76
How and when alternate feather pump used?
Activates automatically for a EF on takeoff or by pressing the #1 or 2 ALT FTHR guarded switch lights
77
When won’t synchrophase work?
On the ground and 1020RPM
78
How propeller pitch controlled?
Modulating oil pressure on either side of the pitch change piston located in the propeller hub. Fails to coarse
79
How does the OSG work?
Signals to FMU to reduce fuel flow to the engine when NP reaches 1173RPM (115%). Fuel reduction then causes power to drop which lower prop RPM
80
#1 or 2 PEC caution light
Loss of electrical power power Loss of both PEC outputs Failure of both PCU valves Causing the prop to be feathered
81
Cautionary PEC fault what happens? (#1 or 2 PEC)
Need maintenance before next flight BETA control below flight idle is unavailable
82
AUPC stands for?
Automatic underspeed protection circuit
83
How to do auto feather test?
Power levers DISC, CL start & feather Press autofeather select button
84
What will you see during auto feather test?
-A/F SELECT above the NP indicators. A/E TEST IN PROGRESS outboard of the NP indicators. - UPTRIM in reverse Video at the top centre of the ED, ITT red radial increases to a higher value - NTOP changes to MTOP and torque bugs increase by 10% A/F ARM appears twice in reverse video replacing A/F SELECT
85
What will you see at the end of a successful A/F test?
A/F TEST PASSED
86
The autofeather system is disarmed ?
When autoleather is deselected
87
The autofeather system will arm, displaying the message A/F ARM, when ?
Power lever angles are greater than 60 degrees and torque above 50%
88
Starter engagement is limited to a maximum of ?
70 seconds
89
What is the purpose of the EVENT MARKER button on the engine control panel?
To store engine data from 2 minutes prior to 1 minute after the button is pressed
90
Fuel flow for each engine is indicated on the engine display in ?
Kilograms per hour
91
Fuel sent to the engines is heated by ?
An oil/fuel heat exchanger
92
Illumination of the #1 ENG FADEC caution light indicates ?
A cautionary fault has occurred
93
When the condition levers are positioned to the MAX/1020 detent during flight the default rating power is ?
NTOP
94
Should the primary source of power fail to an engine FADEC it will be powered by ?
28 V DC essential bus
95
Illumination of the #1 ENG FADEC FAIL warning light will also be accompanied by ?
The engine stabilising at flight idle or shutting down
96
The diameter of the propellers fitted to the Dash 8 Q400 is closest to ?
4 metres
97
At normal takeoff power (NTOP) each engine develops ?
4580 SHP
98
The green arc on the oil pressure gauge ranges between ?
61 and 72 PSI
99
Reduced NP landing mode is cancelled when ?
The power levers are advanced to angles greater than 65 degrees
100
The propeller overspeed governor consists of ?
A flyweight governor and gear pump driven by the reduction gearbox
101
The engine FADECs are located ?
On their respective engines
102
Leaving the combustion chamber the exhaust gases first pass through the...
NH turbine
103
When FADEC detects an engine flameout it automatically...
Activates both engine igniters
104
During normal operations, for how long should an engine be left at START and FEATHER prior to shutdown ?
30 seconds
105
When the power levers are in reverse after landing the normal RPM range is ?
660-950
106
During engine start the ITT is limited to a maximum of...
920 degrees C for 20 seconds
107
To allow the aircraft to climb with maximum climb power with the propeller at 850 RPM...
Select condition levers to 850, press the MCL button
108
The selectable condition lever settings to control RPM during flight are ?
850, 900 and 1020 RPM
109
The engine low pressure compressor is a..
Three stage axial compressor
110
During engine start 'light-up' is detected by FADEC as...
An ITT increase of 20 degrees C
111
Which of the following components is NOT mounted on the propeller reduction gearbox?
DC starter / generator
112
Moving a condition lever to FUEL OFF shuts down the engine by...
Sending an artificial NH overspeed signal to the FADEC, closing the engine feed shutoff valve
113
During engine start, DC generators supply DC power above...
50% NH
114
Illumination of the #1 ENG OIL PRESS warning light indicates the oil pressure has dropped below approximately...
44 PSI
115
When the power levers are moved to the RATING detent position the power produced is...
Relative to condition lever position
Q400
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