Systems Questions (Oral and Test) Flashcards Preview

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Flashcards in Systems Questions (Oral and Test) Deck (120):
1

Is there a speed limit for ADG deployment?

Yes, Vmo (335 Kts)/Mmo (0.85 Mach)

2

What is on the accessory gearbox?

- fuel pump (engine driven high pressure)

- integrated drive generators

- starter (air turbine)

- hydraulic pumps (engine driven) - EDP's

- Oil Pump

- FADEC Alternator (+)

3

When does APR automatically arm?

When N1 RPM of both engines are within 8% of takeoff power, (normal or reduced)

4

What type of takeoff thrust setting is automatically calculated by FADEC?

Normal Takeoff thrust

5

What conditions are you looking for to move the thrust lever to idle position after engine start?

- N2 greater than 20%

AND

- ITT is 120 degrees or less

6

What doors are NOT on the Synoptics page?

- AFT equipment bay

- Crew Escape Hatch

7

How much core air thrust is produced by the CF34-8C5 (CRJ 900) engine?

20%

8

How much bypass air thrust is produced by the CF34-8C5 (CRJ 900) engine?

80%

9

How much engine thrust is produced by APR?

14,750 lbs

10

When will FADEC automatically increase thrust to the operating engine?

When an engine fails and N1 mismatch of 15% or more is detected

11

When is continuous ignition required?

- Takeoffs/Landings on contaminated runways

- Flight through moderate or heavy rain

- Flight through moderate or greater turbulence

- Flight in vicinity of thunderstorms

12

When does the air turbine starter disengage on the starter system?

N2 reaches 50%, of the STOP Switch light is pressed

13

When do we want to introduce fuel on an engine start (moving the thrust lever to idle position)?

- N2 is 20% or greater AND ITT is less than 120 degrees C

If NOT followed (HOT START will occur and FADEC will not allow engine to start)

14

FADEC will automatically abort a start for...

- Hung Start

- Hot Start

- L(R) START ABORT (caution message will be displayed)

15

Where is the Oil Replenishment Tank located?

AFT Equipment Bay

*Reference Slide #73 - Powerplant*

16

What stage of compression is bleed air extracted from?

6th and 10th stage

17

What are the thrust lever Detents located?

- Climb

- TOGA

- Max Power

18

What hydraulic system powers the left thrust reverser? Right thrust reverser?

- Left thrust reverser powered by hydraulic system # 1

- Right thrust reverser powered by hydraulic system # 2

19

Where is the APU located?

Located in the aircraft tail one

20

What causes the APU to automatically shutdown on the ground?

High Oil Temperature, Loss of Oil Pressure ("HOTLOP")

21

In flight, what happens when there is a loss of oil pressure or high oil temperature in the APU?

Caution Message will appear on EICAS display but APU will continue to operate

22

Where does the APU receive fuel from?

Left collector tank via the APU fuel pump

23

What voltage on the batteries are we looking for prior to starting the APU?

Minimum of 22 volts on main battery and APU battery

24

Why do we need a minimum voltage on the main battery and APU battery prior to starting the APU?

Main battery powers the ECU, APU battery provides power to crank the starter

25

When we press PWR/FUEL switch light, what are we looking for on the EICAS display?

Look for "DIGS"

- DOOR OPEN

- IN BITE status message

- GAUGES (RPM and EGT) are displayed

- SOV OPEN status message

26

When can we press the START/STOP Switch light on the APU?

APU IN BITE status message disappears

27

When we press the START/STOP switch light on the APU what are we checking for?

- START switch light illuminates
- APU START status message is displayed
- APU Starts

28

When does the APU START switch light extinguish?

When starter cutouts, occurs between 46-60% RPM

29

When does the APU START status message disappear?

When starter cutouts, occurs between 46-60% RPM

30

When does the APU AVAIL light illuminate?

99% plus 2 seconds

31

What does the APU AVAIL light mean?

The APU is available for electrical loading

32

What is the Primary Purpose of the APU?

Electrical, to operate the gearbox mounted (40 KVA) generator

33

What is the Secondary purpose of the APU?

- Supply Bleed Air for Air Conditioning

- Supply Bleed Air for Pressurization

- Main Engine Starting

34

How long do you have to wait after the APU AVAIL light comes on for using the APU for bleed air?

Pneumatic loading will be available 99% plus 2 seconds

35

When does the APU automatically shut down?

On the ground after 5 seconds

36

What PSI does the APU LCV (load control valve) modulates to?

Regulates manifold pressure of 45 PSI

37

What is the purpose of the APU LCV (Load Control Valve)?

Protects the APU from over temperature condition

38

Why is gravity refueling fuel limits less than the pressure refueling limits?

Because of dihedral of the wing

39

Why is the NACA scoop designed in that shape?

To prevent ice buildup

40

How many motive flow ejector pumps are there? What are their names?

8 Ejectors

- 2 Transfer Ejectors
- 4 Scavenge Ejectors
- 2 Main Ejectors

41

Explain the use of the Transfer Ejectors...

Transfer ejectors are controlled by motive flow created by main ejectors

Transfer ejectors sends fuel from the center tank (when in use) to the Main Tank.

They automatically are activated when the main tank drops to 94% of fuel capacity (on the respective side).

The FSC (Fuel System Computer) will open the respective transfer valve, then close the respective transfer valve when the tank is full

This process continues until the center tank is empty

42

Explain the use of the scavenge ejectors...

Scavenge ejectors takes fuel from the main tanks to the collector tanks

2 per main tank (Synoptics page only shows one)

Gravity line connects the main tanks to the collector tanks to act as redundancy in case the scavenge ejectors fail

43

Explain the use of main ejectors...

Two main ejectors are operated by motive flow created by the the engine driven fuel pumps

Main ejectors takes fuel from the collector tank and delivers fuel to the engine

*Reference Systems Manual Pg. 410, Ch. 11-8*

44

Explain what will happen if the Engine driven fuel pump (EDP) stops working...

Nothing, the associated engine will quit

45

What is the purpose of the Fuel Boost pumps?

Acts as a back up to the main ejectors, when low pressure is detected

Moves fuel from the collector tanks to engines during engine start

46

How are the fuel boost pumps powered?

Electricity (electric boost pumps) DC powered

47

How will the Boost Pumps turn on?

- They need to be "ARMED" (pushed in)

- They need to sense a lower pressure from the main ejector on that side (by the Fuel System Computer)

- When one boost pump turns ON they BOTH TURN ON!
(If the left and right boost pump are pushed in "ARMED" and the left engine is running, but the right engine is NOT running, the right boost pump is sensing a LOW PRESSURE on that side, meaning it will TURN ON, this will make the LEFT fuel boost pump turn on as well... Being able to send fuel under low pressure to start the #2 (right) engine)

48

When will the INOP light on the Fuel Boost Pump turn on?

- Any time the fuel pump switch is not "ARMED" (pushed in)

- When the fuel boost pump has failed

49

What temperature the Fuel/Heat exchanger heats the fuel to?

5 degrees C

50

What does the ENGINE FIRE PUSH or APU FIRE PUSH switch light on glareshield do to the fuel system?

Stops the flow of fuel to the Engine (ENG FIRE PUSH) or stops the flow of fuel to the APU (APU FIRE PUSH)

- Electrically operated Fuel Shutoff Valves (SOV) will close with the push of the respective switch lights on the glareshield

51

When does the XFLOW pump automatically activates?

Imbalance of 200 lbs is detected

52

When does the XFLOW pump in AUTO mode automatically shutoff?

When the computer senses tanks are balanced plus 50 lbs on the low side

53

Regarding the fuel system, when will you use manual cross flow?

When auto Crossflow fails

54

Regarding fuel system, when will you use gravity cross flow?

When the XFLOW pump has failed

- Selecting the switchlight will allow the SOV to open, and gravity to balance the tanks.

- Put the plane into a side slip or "turn" to help the movement of fuel

55

What does EICAS mean?

Engine Indication and Crew Alerting System (EICAS)

56

Master warning, what will you see and hear?

Red message (Required IMMEDIATE corrective action)

Triple Chime will be heard

Cannot be boxed

Possibly an associated MASTER WARNING FLASHER (on glareshield)

57

Master caution, what will you see and hear?

Single chime

Amber messages (Requires PROMPT corrective action)

Messages can be boxed

Possibly an associated MASTER CAUTION FLASHER on glareshield

58

What are advisory messages?

Green messages

Shows safe conditions

Cannot be boxed

59

What are status messages?

White Messages

Shows certain conditions exist

Can be boxed

60

What conditions will allow you to get Takeoff Configuration Warnings?

"PASSFAR"

- Parking Brake

- Autopilot

- Spoilers

- Flaps

- Stab Trim

- Aileron Trim

- Rudder Trim

61

When will the Flight Data Recorder start record?

When BEACON or STROBE light switch is selected to on

62

What screen will show advisory message?

ED 2

63

What happens when ED1 fails?

Primary page is transferred to ED 2

64

What will happen if ED 2 fails?

It fails, there is no automatic transformation

65

What can you do if your PFD fails?

Use the Display Reversionary Panel (DRP) select PFD

66

What can you do if ED 1 fails? What about ED 2?

Use the Source Selection Panel (SSP) and switch to ED 2 (if ED 1 fails) if ED 2 fails, select ED 1.

67

How many AC generators do we have? Name the AC generators..

3 AC generators

- 2 Integrated Drive Generators (IDG)

- 1 APU generator (used for backup with engines running, or used on ground with engines off)

68

How many volts does the IDGs supply to how many AC buses?

115 volts, supplies power to 4 AC buses

69

What does the IDG consist of? (Two Components)

Constant Speed Drive

Generator

70

What is the generator rated at? And to what altitude?

40 KVA, 41,000 feet

71

The IDGs convert variable engine speed to constant generator speed of:

12,000 RPM

72

When does the FAULT light on the IDG Switch light located on the overhead panel illuminate?

"HOTLOP"

High Oil Temperature, Low Oil Pressure

73

How can the IDG be disconnected? What will happen?

Automatically or Manually (by pressing the IDG DISC switch light)

- Once it is disconnected it only can be reset on the ground by maintenance.

- If the electrical disconnect failed, it will disconnect mechanically by shearing of the IDG drive shaft when an over torque condition is detected

74

What is the purpose of the Generator Control Unit (GCU)?

Provides bus priority and protection during normal and non-normal operations

75

What is the output and rating of the APU? To what altitude?

Output is 115 Volts AC,

Rated at 40 KVA

To altitude of 41,000 feet

76

What conditions must be met for the green AVAIL light to illuminate on the AC Switch light?

Conditions of proper:
- Phase
- Voltage
- Frequency

Have been met

77

What is the exhaust danger area in feet?

100 feet

78

What is the radar hazard area?

2 feet

79

What is the limitation regarding passenger the passenger door?

1,000 lbs or 4 passengers

80

Name the AC buses on the CRJ 900

AC BUS 1

AC BUS 2

AC ESS

AC SERV

81

What is the bus priority for AC BUS 1?

- GEN 1, APU, GEN 2, EXTERNAL

82

What is the bus priority for AC BUS 2?

"ONSIDE, INSIDE, OFFSIDE, OUTSIDE"

- GEN 2, APU, GEN 1, EXTERNAL

83

What bus powers the AC ESS bus?

AC Bus 1

84

If AC BUS 1 fails, what bus is automatically transferred? To what bus?

AC ESS BUS, which is automatically transferred to AC BUS 2

85

What bus powers the AC SERV bus?

AC BUS 2

86

When the ADG is deployed, what does it power?

-

87

What can you do to prevent an "ADG STALL"?

Configure aircraft no later than 140 knots

88

What airspeed will the DC Essential bus load shed with the ADG deployed?

Between 155-160 Knots

89

Explain the use of the Power Transfer Override switch...

Used when one or more normal power generation systems has been recovered, with the ADG deployed.

- Important to re-establish normal AC power to avoid load shed of the DC ESS bus

90

Power for 28 VDC is supplied by:

- 4 Transformer Rectifier Units (TRUs)

91

How many Transformer Rectifier Units (TRUs) do we have on the CRJ 900?

4

92

What are the Transformer Rectifier Units (TRUs) rated at?

120 amps

93

What is the purpose of the Transformer Rectifier Unit (TRUs)

Transforms then rectifies 115 volt AC power to 28 volt DC power

94

How many and what buses do the TRUs supply power to?

4,
- BUS 1

- BUS 2

- ESS BUS

- UTIL BUS

95

What is the main battery rated at?

24 Volts DC, 17 Ampere-hour

96

What is the APU battery rated at?

24 volts DC, 43 Ampere-hour

97

What buses does the batteries supply DC power to?

- Main batt dir bus

- APU batt dir bus

- DC EMER bus

- DC batt bus

98

The main and APU batteries are kept in a charged condition by battery charger?

AC BUS 1 and AC Service bus

99

Fault protection for each generator is incorporated in each...

Generator Control Unit (GCU)

100

IDG 2 normally powers...

AC BUS 2

AC SERV BUS

101

What is the main battery rated at?

24 Volts DC, 17 Ampere-hour

102

What is the APU battery rated at?

24 volts DC, 43 Ampere-hour

103

What buses does the batteries supply DC power to?

- Main batt dir bus

- APU batt dir bus

- DC EMER bus

- DC batt bus

104

When on the ground with the ADG deployed we could lose power unless what...

ADG handle is pulled, otherwise battery power is removed from the DC ESS bus

105

When on the ground with the ADG deployed we could lose power unless what...

ADG handle is pulled, otherwise battery power is removed from the DC ESS bus

106

Which pack controls the flight deck?

Left pack

107

Which pack controls the cabin?

Right pack

108

How many smoke detectors are there in the fwd cargo bay?

Three

109

How many smoke detectors in the aft cargo bay?

Two

110

What does CPAM do with regards to oxygen masks?

Automatically drops oxygen masks at 14,000 feet cabin altitude

111

When does the CABIN ALT caution message come on

Greater than or equal to 8,500 cabin altitude

112

When does the CABIN ALT warning message occur?

Cabin altitude greater than or equal to 10,000 feet

113

Which Hydraulic pumps are running prior to pushback?

pump 3A

114

Which hydraulic pumps are running with one engine running (Taxiing)?

Pumps 1A, 3A

115

Which hydraulic pumps are running while you are taxing and second engine is running?

Pumps 1A, 2A, 3A

116

When reading the taxi checklist, which hydraulic pumps are running?

Pumps 1A, 1B, 2A, 2B, 3A, 3B

117

We are on takeoff and we lose the right engine, which pumps are running?

All pumps are running besides 2A

118

Once we clean up the airplane at acceleration altitude, what hydraulic pumps are running

1A, 3A, and then QRH will direct us to turn on 3B

119

If the APU fuel pump fails, will it shut down?

No, Internal bypass valve will open and high pressure gear driven pump will still be able to draw fuel in for the APU to operate

120

For an unattended APU fire on the ground, what will happen? In flight?

On ground, the APU will shut down automatically (sensing a fire by the dual loop protection) and 5 seconds later, the Firex bottle will be automatically discharged with Halon.

In Flight, the APU will shut down automatically, but the crew must discharge the Fire bottle manually