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psa 2 > EICAS, Power, plant APU, Air Conditioning & Pressurization > Flashcards

EICAS, Power, plant APU, Air Conditioning & Pressurization Flashcards

0
Q

APU;

What is indicated by the illumination of the PUMP FAIL light?

A

APU fuel pump failed to energize

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1
Q

APU;

What happens when you push the PWR FUEL swichlight

A 
When pressed in:
APU fuel pump is energized
ECU powers up
APU IN BITE status message appears on ED2
APU and RPM gages appear on ED2
The door open on the ground
APU shut off valve opens
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2
Q

APU;

What is indicated by the illumination of the SOV FAIL light?

A

APU fuel shut off valve is not in the commanded position

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3
Q

APU;

What happens when the START/STOP switchlight is pressed in?

A

In flight the APU door will modulate open as needed
The starter motor is energized
White start light illuminates
At 40-60% RPM the START light extinguishes
At 99% RPM plus 2 seconds the green AVAIL light illuminates

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4
Q

APU;

When the START/STOP switchlight is pressed out what happens

A

Fuel shut off valve closes
APU shuts down
The green AVAIL light extinguishes
The inlet door closes

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5
Q

What is the primary function of the APU

A

To provide electrical power

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6
Q

How many VAC does the APU generate

A

115 VAC

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7
Q

Where is the APU fuel pump and how many volts DC is it

A

In the left collector tank

28 VDC

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8
Q

What would cause the APU to shut down in flight or on the ground

A 
Overspeed >106%RPM
Loss of OVERSPEED protection
Loss of speed sensor signals
No APU rotation
No APU light off
Slow start
No acceleration 
Speed fallback
APU fire/emergency
Loss of air inlet
APU door failure
Uncommanded door closure
ECU internal failure
Loss of DC power
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9
Q

Will the APU shut down on the ground due to high oil temp or low oil pressure

A

Yes

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10
Q

Will the APU shut down in flight due to high oil temp or low oil pressure

A

No

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11
Q

If the APU shuts down due to fire on the ground will the bottles fire

A

Yes

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12
Q

At what altitude will the surge control valve open

A

17000

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13
Q

The APU will not start if the RPM is rotating above what speed on the ground and in flight

A

5% on ground

12% in flight

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14
Q

If the APU door is open or the door position is unknown with the APU shut down what is the limitations

A

Flight restricted to 220 KIAS

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15
Q

Why is the APU door restricted to 220 KIAS while shut down

A

To prevent APU from windmilling without proper lubrication

To insure RPM stays below 12% in the event the APU becomes necessary to start in flight

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16
Q

Is there a way around the 220 KIAS restriction with the APU door open

A

Yes, normal speed may be used if APU is running

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17
Q

If the APU fuel pump fails will the APU continue running

A

Yes, but cannot be restarted without the pump

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18
Q

What is the purpose of the load control valve (LCV)

A

The LCV varies pneumatic load to ensure electrical power and 45psi in the manifold

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19
Q

Can APU bleed air be used for anti-ice

A

No

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20
Q

What is the minimum battery voltage for the APU

A

22 volts

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21
Q

What powers the APU door, and what powers the ECU

A

APU battery provides power to the door and is secondary for the ECU. the main battery is the primary power source for the ECU

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22
Q

If the APU is left unattended can the ground crew shut it down

A

Yes, APU shut off switch on the forward nose or in the APU compartment

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23
Q

What do the following EICAS display color codes mean:

Red, amber, green and white

A

Warning, caution, advisory, status

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24
Q

What powers the two EICAS screens

A

The battery bus

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25
Q

Are the two EICAS cooling fans powered by the battery bus

A

No

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26
Q

What gathers data for EICAS displays

A

(DCU) Data Concentrator Unit

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27
Q

How many chimes for CAUTION message at a WARNING message

A

One chime

Three chimes respectively

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28
Q

Name a few other aural warnings that the DCU’s can generate

A

Fire bell for fire
warbler for stall
Clacker for an overspeed
Siren for windshear and terrain

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29
Q

Which aural warnings will the DCU audio warning inhibit switch not cancel

A

Windshear, EGPWS and TCAS

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30
Q

When will the oil pressure gauges be present on the EICAS primary display in addition to the digital readout

A

With the engines shut down, or with low oil pressure

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31
Q

When will the N1 vibration gauge replace the oil gauges

A

With the engines running and normal oil pressure

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32
Q

How is N2 vibration monitored

A

The system monitors N2 vibration independently without display.
If N2 vibration exceeds a predetermined amount, VIB will be displayed inside the N2 gauge

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33
Q

When will the flap gauge disappear

A

With the wheel brake temps in normal range and the gear, slats and flaps retracted

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34
Q

When will the wheel brake temps indicators disappear

A

With the wheel brake temps in the normal range, and the hear, slats and flaps retracted

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35
Q

When can you box caution messages and how

A

Pressing the CAS button with both engines running. New message will appear above the boxed MSG icon

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36
Q

When are caution messages inhibited on take off

A

Short answer: Thrust lever advancement to 400 feet
Long answer: With the power greater than 79% N1 to 100 KIAS some messages will be inhibited; when the speed is greater than 100 KIAS UP TO 400 feet on the radar altimeter most messages will be inhibited

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37
Q

When are certain caution messages inhibited on landing

A

400 feet AGL to WOW plus 30 sec. Or when climbing above 400 feet

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38
Q

What happens if ED1 fails

A

Primary page will display automatically on ED2

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39
Q

If ED1 fails the primary page will revert to ED2 how can the Synoptics page be viewed

A

Select EICAS on the MFD reversionary panel and use the ECP (EICAS Control Panel) to cycle through synoptic page or select ED2 on the source select panel to un-inhibit the ECP then select the desired Synoptics page

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40
Q

Name several conditions that must be satisfied for the TAKOFF CONFIG OK advisory message to be displayed

A 
Parking brake off
Flight spoilers stowed
Flaps between 8 and 20
Stabilizer trim inside green takeoff band
Rudder trim inside takeoff range
Aileron trim inside takeoff range
Autopilot off
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41
Q

What does the FADEC do

A

Controls engine starting, fuel flow, compressor airflow and ignition automatically

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42
Q

Describe the engine fuel system

A

Fuel is drawn from the collector tanks through motive flow, and supplied to the engine fuel pumps and fuel metering unit (FMU). Metered fuel is then supplied to the fuel injectors where it is sprayed into the engine combustion chamber directed by the FADEC

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43
Q

What happens when pushing the START switchlight

A

The isolation and start valves open and the Air Turbine Starter (ATS) will engage illuminating the START switchlight and the appropriate L or R START status message on ED2

44
Q

When will the CONT switchlight illuminate and the igniters fire automatically

A

FADEC senses a flameout, prior to stick shaker during a stall, or when airflow is disrupted in the engine

45
Q

What drives the accessory gear box

A

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

46
Q

What items are in the accessory gear box

(HOFFAI)

A 
H ydrolic pump 
O il pump
F ADEC alternator
F uel pump
A ir turbine starter
I ntergrated drive generator
47
Q

What are the three interconnected fuel pumps within the accessory gear box

A

Low pressure pump
High pressure pump
Motive flow pump

48
Q

What are the rated thrust outputs of the engines

A

Normal is 12,670

APR is 13,790

49
Q

What drives the N1 fan

A

Low pressure turbine

50
Q

How many stages is the low pressure turbine

A

Four

51
Q

What comprises an engine stage

A

A set of staters and rotors.

52
Q

How much thrust is provided by the N1 fan

A

80%

53
Q

What powers the variable geometry vanes (VG)

A

Fuel pressure directed by the FADEC

54
Q

What is the operability valve

A

The operability valve 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

55
Q

What powers the operability valve

A

Fuel pressure directed by the FADEC

56
Q

How is fuel heated prior to combustion

A

Fuel/oil heat exchanger

57
Q

How many channels does the FADEC have and when do they change channels

A

Two handles A and B, channels change when N2 RPM falls below 7% on EVERY engine shutdown

58
Q

How many FADEC channels are in use at once

A

One channel commands the engine while the other channel monitors the controlling channel and is in standby in case the commanding channel fails

59
Q

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

A

In an engine OVERSPEED situation both channels will command the fuel valves to close to bring the speed into normal range

60
Q

What happens if both FADEC channels fail or FADEC loses power

A

The engine will fail

61
Q

Can the left engine FADEC control the right engine

A

No

62
Q

Do the left and right engine FADEC cross talk with each other

A

Yes, they compare engine speed and thrust reverser position information

63
Q

While cross talking, when will one engine’s FADEC assume the other engine’s FADEC has failed

A

Difference of 15% N1

64
Q

When an engine fails, what will the operative engine’s FADEC automatically command

A

APR in the TOGA detent, MCT in the climb detent, and a power increase in the cruise range

65
Q

What will the FADEC command if a thrust reverser deploys in flight

A

It will reduce that engines thrust to idle

66
Q

At what speed does the FADEC lock in the final N1computation during takeoff

A

65 KIAS

67
Q

What powers the FADEC

A

Aircraft electrical power with an N2 of less 50% and the FADEC alternator with N2 of greater than 50%

68
Q

When will the L or R OOL LEVEL LO status message

appear

A

Below 57% with the engine running and below 80% with the engine stopped

69
Q

What must the pilot verify on takeoff using FLEX takeoff

A

Computed thrust display on primary display is equal or greater than that required in the QRH

70
Q

What powers the igniters

A

Igniter A is powered by the AC essential bus and igniter B is powered by the aircrafts battery and an inverter

71
Q

Max altitude for engine relight

A

FL210

72
Q

What are the five different engine idles

A 
Flight idle
Approach idle
Landing idle
Reverse idle
Ground idle
73
Q

When is APR armed on takeoff

A

Within 8% of target thrust

74
Q

What does the blue circle indicate on the N1 gauge during cruise flight

A

Max thrust setting for cruise

75
Q

How is the aft cargo bay receive conditioned air

A

Mixing manifold by recirculating fan and supplemental heat is provided by an electrical heater

76
Q

Bleed valve rotary selector:
AUTO
CLSD
MANUAL

A

AUTO-The ACSC’s automatically control all bleed air
CLSD-Closes bleed air from the engine PRSOV’s and APU
MANUAL-Enables the ISOL switch and BLEED SOURCE rotary selector for manual operation

77
Q

BLEED AIR panel;

ISOL switch

A

Divides or connects the left and right pneumatic systems

78
Q

What happens when the L or R PACK switchlight pushed out

A

The pack flow control valve closes and the white OFF light illuminates

79
Q

What happens when L or R PACK switchlight is pushed in

A

The pack flow valve opens and the white OFF light extinguishes

80
Q

AIR-CONDITIONING

What does the amber FAULT light mean

A

Pack has failed in both auto and manual mode due to an over temp or over pressure condition

81
Q

AIR-CONDITIONING

RAM-AIR guarded switchlight what happens when pushed in.

A

The ram air valve will open and the white OPEN light illuminates along with the white status message on ED2

82
Q 
AIR-CONDITIONING;
CARGO switch explain all three positions
OFF
AIR
COND AIR
A

OFF- Ventilation to the aft cargo bay is shut off
AIR-The intake and exhaust valves open and conditioned air is provided to the aft cargo bay from the mixing manifold
COND AIR-Supplemental electrical heater is armed for automatic operations

83
Q

How is the bleed air from both engines kept separate

A

Isolation valve

84
Q

What does the cabin pressure controller do

A

Independently acquires and monitors cabin pressure, outside air pressure, differential pressure and rate of change information also commands the outflow valve to move based on information

85
Q

What does the CPAM do ( Cabin Pressure Acquisition Module)

A

First it acquires cabin pressure and rate of change information displayed on ED2. In the event of CPC failure it will let you know how to operate the outflow valve. Second it will command the passenger oxygen mask to deploy and the seat belt no smoking signs to illuminate if cabin altitude exceeds 14,000 feet

86
Q

During automatic mode when the CPC’s are in control, how many operational phases are there

A

Seven

87
Q

Name the CPC’s operational phases (Cabin pressure controllers)

A 
Ground
Takeoff
Flight abort
Climb/cruise
Descent
Landing
Touch and go
88
Q

What does the flight abort phase do

A

It will assume dept elevation is landing elevation until airplane climbs through 6000 feet or ten mins pass

89
Q

Will the cabin fully depressurization while flying 41000 feet

A

No, up 14,500 feet plus or minus 500 feet

90
Q

What does the ground valve do

A

Insures depressurization on the ground and increases air flow to avionics

91
Q

When does the ground valve close and open

A

Cabin door closes and when WOW

92
Q

What does the OVBD COOL FAIL status message

A

Ground valve did not open on landing

93
Q

Which pack cools the cockpit, cabin

A

Left pack cools cockpit and right cools cabin

94
Q

What protects the airplane from over pressure or negative pressure situation

A

Two safety valves one for over pressure and one for negative pressure

95
Q

When does the bleed air switch from The APU to the engine after takeoff

A

TOGA detent with gear up and flaps 20 or less

96
Q

When does bleed air switch from engine to APU on approach

A

Gear extended or flaps 20 or greater with thrust levers out of TOGA

97
Q

Is the external ground air connector displayed on ECS page

A

No, however a digital air pressure readout will indicate air is being provided

98
Q

What emergency requires the RAM-AIR switchlight to be pressed

A

Emergency ventilation of the cabin is required

99
Q

Where does ram air come from

A

A scoop at the base of the vertical stabilizer

100
Q

When does the CABIN PRESSURE aural warning sound

A

Cabin altitude exceeds 10000 feet or pressure differential exceeds 8.7 psi

101
Q

What is the water extracted from the packs used for

A

It is sprayed across the pack heat exchangers in the ram air duct

102
Q

Which hydronic systems are cooled by the ram air

A

System 1 and 2

103
Q

What does the amber CAUTION ALT caution message indicate

A

Cabin altitude is between 8500-10000 feet

104
Q

What is the function of the pressure regulating shutoff valve (PRSOV)

A

Modulates as commanded by the air conditioning system controller to maintain approx 45 psi in the bleed air manifold

105
Q

Briefly describe the Air Cycle Machine(ACM)

A

Cycles hot air into cold by compression then expansion

106
Q

Hat is the function of the packs hot air shut off valve

A

Opens at high altitudes to supply pre-cooled air to the pack’s flow control valve

107
Q

Describe the flow of air through the pack compartment

A 
Precooler
Heat exchanger
Compressor
Heat exchanger 
Reheater
Condenser
Water extractor 
Turbine

psa 2 (12 decks)

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