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CRJ700 Systems > Powerplant > Flashcards

Powerplant Flashcards

1
Q

What type of engines does the airplane have?

A

General Electric CF34-8C5B1

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2
Q

What is the maximum N1 rpm?

A

99.4% which is the top of the green arc

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3
Q

What is the maximum N2 rpm?

A

99.3% which is the top of the green arc

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4
Q

What is the maximum oil temperature?

A

164’

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5
Q

What is the minimum oil pressure?

A

25 psi

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6
Q

The engines must remain at idle after start until what parameters are reached?

A

Don not exceed 75% N1 for 2 minutes or until all operating indications are in the normal range, which ever is longer

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7
Q

What is the engine cool down limitation?

A

After landing the engine must be at or near thrust for two minutes prior to shutdown

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8
Q

White drives the accessory gear box?

A

The N2 compressor, which is driven by the high pressure turbine

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9
Q

What items are on he accessory gear box?

A 
Hydraulic pump
Fuel pump (3 pumps on a shaft)
Oil pump
FADEC alternator 
Integrated drive generator 
Air turbine starter
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10
Q

There are three interconnected fuel pumps with in the accessory gear box. What are they?

A

Low pressure pump
High pressure pump
Motive flow pump

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11
Q

What are the rates thrust outputs of the engines?

A

Normal is 12670 and APR 13790

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12
Q

What drives the N1 fan?

A

The low pressure turbine

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13
Q

How many stages is the low pressure turbine?

A

Four

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14
Q

What comprises an engine stage?

A

Stage includes a set of stators and rotors.
Compressor section: spin rotors blades simultaneously accelerate and compress air. Stator vanes remain fixed and direct air to the next set of rotor vanes.

Turbine section: escaping exhaust gas spins turbine rotors. Turbine rotors used to spin the compressor blades through an interconnected concentric shaft.

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15
Q

How much of the engines overall thrust is provided by he N1 fan?

A

80%

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16
Q

What powers the Variable Geometry vanes?

A

Fuel pressure directed by the FADEC

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17
Q

What is the operability valve?

A

Works in conjunction with the VG vanes to remove internal air pressure from the compressor section of the engine reducing the risk of a compressor stall.

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18
Q

What powers the operability valve?

A

Fuel pressure directed by the FADEC

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19
Q

How is fuel heated prior to combustion?

A

Through the use of a fuel/oil heat exchanger

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20
Q

How many channels does the FADEC have, and when do the channels change?

A

There are 2 channels A and B. They change when N2 rpm falls below 7% on every other engine shut down

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21
Q

How many FADEC channels are in use at once?

A

One channel commands the engine. The other channel monitors and is in standby Incase the commanding channel fails

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22
Q

Is there ever a time when both FADEC channels will command the engine simultaneously?

A

In an over speed both FADEC channels will command the fuel valves to bring the speed into normal range

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23
Q

What happens if both FADEC channels fail or the FADEC loses power?

A

The engine will fail

24
Q

Can the left engines FADEC Control the right engine?

25
Do the left and right engines FADEC crosstalk to each other?
Yes. They compare engine speed and thrust reverser position information.
26
Whip cross talking when will one engines FADEC assume the other engine has failed?
When the difference is at least 15% N1
27
When an engine fails, what will the operative engines FADEC automatically command?
APR in the TOGA detent, MCT in the Climb detent and a proportionate increase throughout the cruise range
28
What will the FADEC command if a thrust reverser deploys in flight?
It will reduce that engines thrust to idle
29
At what speed does the FADEC lock in the final N1 computation during takeoff?
65kts
30
What powers the FADEC?
Aircraft electrical power with an N1 of less than 50% and the FADEC alternator with an N2 of greater than 50%
31
If we wait for the FADEC to shut the engine down during a hot start are we guaranteed that the ITT limit will not be exceeded?
No
32
Will the engine automatically shut down for a hot start on the ground?
Yes
33
Is there ITT protection and subsequent auto-shutdown in flight?
No
34
What is the time limit for single engine APR thrust?
10minutes
35
What is the time limit for normal or FLEX thrust?
5minutes
36
When will the L or R oil level LO status message appear?
Below 57% with the engine running and below 80% with the engine stopped
37
What is FLEX thrust?
It’s a reduced power setting for takeoff calculated using an assumed temperature
38
When using FLEX thrust for takeoff what must the PIC verify prior to takeoff?
The PIC must verify the computed thrust displayed on the primary display is equal to or greater than the required QRH vol 1
39
What color will the FLEX thrust rating be displayed in on the primary display?
Magenta
40
When is FLEX thrust not permitted?
Wing/Cowl anti-ice bleeds are in use Runway is contaminated Warnings or forecast windshear/downdrafts Anti skid system inop
41
What stages of the engine is bleed air extracted from?
6th and 10th stage
42
Can both stages be used at once?
No
43
What powers the igniters?
Igniter A is powered by the AC essential bus and igniter B is powered by the aircraft’s battery and an inverter
44
When is the use of continuous ignition required?
Bc of thunderstorms Moderate to sever turbulence Moderate to severe rain Operation on contaminated runway
45
When will continuous ignition fire automatically?
FADEC senses flame out Approaching a stickshaker during a stall Disruption of airflow detected through the engine
46
How are the thrust reversers actuated?
Hydraulically
47
How are the thrust reversers locked?
Hydraulically and mechanically
48
What is he maximum ITT for engine start on the ground and in flight?
120’ on the ground and 90’ inflight
49
What is the maximum altitude for engine relight?
FL120
50
What are the 5 different engine idles?
``` Flight idle Approach idle Landing idle Reverse idle Ground idle ```
51
When is APR armed on takeoff?
When within 8% of target thrust
52
When is the go around mode armed on approach?
With the gear extended or the flaps greater than 20
53
What did the blue circle indicate on the N1 gauge during cruise flight?
The maximum thrust setting for cruise
54
What are the engine warmup limitations?
Engines must remain at idle until oil pressure is in the normal range. Don’t exceed 75% of N1 until all indications are in the green or two minutes has passed whichever is greater
55
What is the engine cool down limitation?
After landing the engine must be at or near idle thrust for two minutes prior to shutdown

CRJ700 Systems (17 decks)

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