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-x- A320 stuff from other decks -x- > APU > Flashcards

APU Flashcards

1
Q
  1. (DSC-49-20) When the Apu master switch is released, a normal Apu shutdown occurs; (a) Without delay in all cases. (b) With a delay in all cases. (c) With a delay if the bleed air was in use. (d) Only after the main batteries are switched off.
A

(c) With a delay if the bleed air was in use.

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2
Q
  1. (DSC-49-10) What are the apu manual shut down possibilities in the cockpit; (a) Apu master switch push button, Apu fire push button switch. (b) Apu master switch push button. (c) Apu fire push button switch, Apu shut off push button. (d) Apu avail push button switch.
A

(a) Apu master switch push button, Apu fire push button switch.

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3
Q
  1. (LIM-49) Normal electrical system being available, you may restart the apu up to; (a) 31,000 ft. (b) 20,000 ft. (c) 41,000 ft. (d) 45,000 ft.
A

(c) 41,000 ft.

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4
Q
  1. (DSC-49-10) When the Apu is running, the Apu fuel pump; (a) Runs when the tank pump pressure is not sufficient. (b) Runs all the time. (c) Runs only in flight. (d) Runs when the Apu fuel pump is selected on.
A

(a) Runs when the tank pump pressure is not sufficient.

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5
Q
  1. (DSC-49-10) Normal Apu rotation speed (N%) is; (a) 99% ( Ground, nil bleed demand, OAT > 18c <35c) (b) Always steady at 99 %. (c) Always 80 % (d) Always 75 %.
A

(a) 99% ( Ground, nil bleed demand, OAT > 18c <35c)

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6
Q
  1. (DSC-49-20) Apu master switch selected on; (a) On illuminates blue, Apu system is supplied and Apu starts at 95%, Avail comes on. (b) On illuminates blue, Apu system is supplied, Apu starts as soon as start P/b is depressed and intake flap opens. (c) Apu fuel pump runs immediately. (d) On illuminates green and Apu starts.
A

(b) On illuminates blue, Apu system is supplied, Apu starts as soon as start P/b is depressed and intake flap opens.

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7
Q
  1. (DSC-49-10) Apu bleed air is controlled; (a) By ECB ( N% adjustment) (b) Not controlled. (c) By Apu bleed valve, which operates as a shut off valve. (d) By pack flow switch Lo/Norm/Hi on overhead panel.
A

a) By ECB ( N% adjustment)

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8
Q
  1. (DSC-49-20) Apu N indication becomes amber on ECAM SD, when; (a) N >/= 107 %. (b) N >/= 102 %. (c) N >/= 99 %. (d) N >/= 95 %.
A

(b) N >/= 102 %.

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9
Q
  1. (DSC-49-20) Apu EGT indication becomes red on ECAM SD, when; (a) EGT >/= 715 c ( Apu running) (b) EGT >/=1038 c ( Apu running) (c) EGT >/= 675 c (Apu running) or EGT . 1090 c (during apu start). (d) EGT .> 950 c.
A

c) EGT >/= 675 c (Apu running) or EGT . 1090 c (during apu start).

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10
Q
  1. (DSC-49-10) On ground, Apu provides; (a) Electrical power & hydraulic power. (b) Electrical power & bleed air. (c) Hydraulic power & bleed air. (d) Hydraulic power & electrical power.
A

(b) Electrical power & bleed air.

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11
Q
  1. (LIM-49) Air Bleed extraction for wing anti-ice: (a) Is permitted. (b) Is not permitted. (c) Is permitted only on ground. d) Is permitted only in flight.
A

(b) Is not permitted.

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12
Q
  1. (DSC-49-10) Can you start the Apu using the a/c batteries: (a) Yes. (b) No. (c) Only on the ground. d) Only in flight.
A

(a) Yes

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13
Q
  1. (DSC-49-10) The Apu is supplied from the: (a) Left fuel feed line. (b) Right fuel feed line. (c) Centre tank always. (d) Right inner tank always.
A

(a) Left fuel feed line.

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14
Q
  1. (DSC-49-20) If air bleed was used, after a manual shut down sequence the apu: (a) Stops immediately. (b) Keeps running for four minutes. (c) Keeps running for between 60 sec. (d) Keeps running for 10 mins.
A

(c) Keeps running for between 60 sec.

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15
Q
  1. (DSC-49-20) Avail light illuminates on start p/b when; (a) External power is disconnected. (b) 2 seconds after Apu N reaches 95 %. (c) Apu electric power is used. (d) Main engine generator is on line.
A

(b) 2 seconds after Apu N reaches 95 %.

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16
Q
  1. (DSC-49-10) The Apu has its own lubrication system; (a) Yes. (b) No. (c) No, it is lubricated and cooled by hydraulic fluid from the green system. (d) No, it uses the same oil as engine no. 2.
A

(a) Yes.

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17
Q
  1. (DSC-49-10) What determines the Apu speed in accordance with air bleed demand; (a) Electronic control box. (b) Air conditioning system. (c) Air intake system. (d) Main engine RPM.
A

(a) Electronic control box.

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18
Q
  1. (DSC-49-10) Besides the master switch on the cockpit Apu panel, Apu shutdown is possible by; (a) Switching off the left fuel pumps. (b) Switching off the right fuel pumps. (c) Turning off both main batteries. (d) Pressing the Apu Shut Off push button on the external interphone panel or pushing the APU fire pushbutton (o/head fire p/b).
A

(d) Pressing the Apu Shut Off push button on the external interphone panel or pushing the APU fire pushbutton (o/head fire p/b).

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19
Q
  1. (LIM-49) The supply of electrical power has priority over bleed air supply; (a) No. (b) Yes. (c) Only above 25000 feet (d) Only when the ditching pushbutton has been selected on.
A

(b) Yes.

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20
Q
  1. (DSC-49-20) Master switch on, the ; (a) Apu starts. (b) ECB is electrically supplied. (c) Air intake flap closes. (d) Apu fuel pump starts immediately.
A

(b) ECB is electrically supplied.

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21
Q

What causes an automatic EMER. SHUTDOWN of the APU? When is this facility available?

A
  • APU fire on the ground. - Pressing the APU fire on the exterior panel.
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22
Q

Why would the APU continue to run after being selected OFF?

A

If using APU bleed air, the APU keeps running for cooling period of 60sec.

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23
Q

What happens if excessive EGT is sensed?

A

FAULT amber light, and a caution appears on ECAM. Followed by an automatic shutdown.

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24
Q

AUTO SHUTDOWN is available during which phases of flight? And EMER SHUTDOWN (Fire)

A

1500’ – 800’

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25
Q

What causes the FLAP to OPEN? What does the message FLAP OPEN mean exactly?

A
  • When MASTER SW p/b is pressed. - In green when APU air intake flap is fully open. - In amber after 3min APU has been switched OFF.
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26
Q

What happens if the START button is pressed immediately after the MASTER button is pressed?

A
  • Green light comes on when N is >99.5% or 2sec after N reaches 95% - APU can now be used for electrics and/or bleed
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27
Q

What is the Maximum altitude for APU start?

A
  • 41,000’ by electrical power - 25,000’ by battery only - 14,500’ on the ground
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28
Q

What are the altitude limitations for the use of APU bleed & packs?

A

2 packs: 15,000’ 1 pack: 22,500’

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29
Q

What would you do if the SD showed LO OIL LVL?

A
  • Refill the oil - Low APU oil when the aircraft is on the ground, and the APU is not running. - The APU may be started ad operated even if the LOW OIL LEVEL ECAM advisory is displayed. - Maintenance action is required within next 10hrs of APU operation.
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30
Q

What is the APU start limitation?

A

After 3 starter motor duty cycles, wait 60min before attempting 3 more cycles.

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31
Q

What are the APUs max operating altitude limits(flight envelope)?

A

FL391 - max operating altitude -Generator use altitude -Start limit with normal pwr FL250 - max start limit when solely on bat. pwr FL200 - max bleed air use

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32
Q

Why must the aircraft batteries be on for all APU starts AND when the APU generator is the sole source available to the starter motor?

A
  1. Turning them ON permits the APU starter motor to connect to the aircraft battery buses which are the only source for the starter motor 2. In the event an APU Fire when the APU generator is the sole source of power, the batteries being in ensures a pwr source for proper APU shutdown and extinguisher discharge
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33
Q

Uses of APU bleed air Can and can nots?

A

CAN - Engine starts A/C pack operation CANNOT - wing anti ice

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34
Q

What Protection is not provided by the Full Authority Digital Control(FADEC) during inflight Engine starts?

A

EGT Protection is not provided

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35
Q

Which malfunction can the FADEC not identify therefore cannot automatically abort?

A

Tailpipe Fire

36
Q

How does a pilot manually abort a start?

A

By placing the respective ENG NASTER switch to OFF

37
Q

What is the effects on both FADECs when the aircraft is initially powered

A

Both FADECs are energized and perform a self test. After the test they deenergize. If the FADEC is not energized the engine indications are replaced with Amber Xs.

38
Q

When do the FADECs reenergize after the self test

A

When the ENG MODE is placed to IGN START

39
Q

How is the FADEC powered after engine start

A

Dedicated alternator

40
Q

Minimum oil quantity for engine start

A

9.5 quartz +0.5 quart for every hour of flight

41
Q

What’s the meaning of the FLAP OPEN and LOW OIL LEVEL indications on the ECAM APU page? (Pic)

A
  1. FLAP OPEN: A. APU air intake flap is fully Open B. Flap is commanded open when APU MASTER SW pb is selected ON C. APU starter motor is inhibited until flap Is fully open 2. LOW OIL LEVEL: A. APUs oil tank quantity is sensed to be low B. Indication would appear immediately When the APU MASTER SW pb is Selected to ON and the aircraft is on Ground 3. Note: with the LOW OIL LEVEL indicated, the APU START pb should not be selected ON. Contact maint.
42
Q

What are the indications when the APU is on speed? (Pic)

A
  1. AVAIL (green) appears on the: A. APU START pb B. ECAM APU page C. E/WDs memo section(APU AVAIL) 2. APU BLEED (green): A. E/WDs memo section B. Replaced APU AVAIL when the APU Bleed valve is open 3. Note: APU generator is never indicated on the E/WD memo section
43
Q

What’s the function of the APU MASTER SW pb? (Pb)

A
  1. ON (blue) A. APU Computers is enabled and performs a self test B. Air intake flap is commanded open 2. Light out - the APU computer is deactivated and the APU shuts down 3. FAULT (Amber) - an automatic shutdown or failed start has occurred
44
Q

How do you shut down the APU normally?

A

Selecting the APU MASTER SW to OFF(light out)

45
Q

What’s the function of the APU BLEED pb and APU GEN pb? (Pic)

A
  1. APU BLEED pb - ON (blue) commands the APU bleed valve open 2. APU GEN pb: A. Light out - APU generator will auto Energize once the APU is in speed B. OFF (white) - APU is deenergized
46
Q

How can continuous ignition (both igniters) be activated manually? (Pic)

A

By rotating the ENG MODE Selector from NORM to IGN/START following an engine start

47
Q

What is the indication that continuous ignition has been activated?

A

IGNITION (green) appears in the memo section of the E/WD and is the only indication.

48
Q

What are the indications for engine igniters on the ECAM ENGINE page? (Pic)

A
  1. During engine start, when the igniters have been energized, the igniter indication is displayed near the bottom of the ECAM ENGINE page next to the start valve indication 2. Igniters are labeled A & B in green for each engine 3. AB indicates that both igniters are in use(continuous ignition)
49
Q

What are the indications on the E/WD N1 gauges? (Pic)

A
  1. Green - digital numeric N1 speed and analog green line N1 speed 2. Amber tick mark - FADEC computed maximum N1 for current ambient temperature 3. Red arc - maximum permissible 4. White circle - current position of the associated thrust lever 5. Blue arc - indicates the difference between actual N1 and the thrust commanded by the autothrust system 6. Boxed Amber REV - one or more of the reverser blocker Doors is not stowed or unlocked 7. Boxed green REV - all four reverser blocker doors are fully deployed
50
Q

What’s the meaning of the Grey background on the E/WD N2 page? (Pic)

A

An active engine start sequence is occurring. When it is complete the Grey background disappears

51
Q

What occurs when an ENG MAN START pb is selected ON? (Pic)

A
  1. ON (blue) - illuminated within the pb 2. The respective engine start valve opens if the ENG MODE Selector is in CRANK or IGN/START and bleed air is available 3. The respective valve will auto close at 50% N2 but the ON light will remain illuminated
52
Q

What is the igniter behavior during automatic and manual starts. ( Pic)

A
  1. Automatic - igniters alternate between starts(A or B) 2. Manual - both igniters are automatically activated(AB)
53
Q

Describe the movement of the Amber Max EGT tick mark on the engine EGT gauge during and after engine start. (Pic)

A
  1. During start the tick ark moves to the start EGT limit 2. When start complete the tick mark returns to the normal Maximum Continuous Thrust (MCT) EGT limits
54
Q

What is the function of the controls and indicators on the ENG panel? (Pic)

A
  1. ENG MASTER 1(2) switches - A. ON - initiated the engines start sequence B. OFF - shuts down the engine 2. ENG MODE Selector - A. NORM - normal ops after engine start B. IGN/START - selected prior to engine start 1. Displays the ECAM ENGINE page on The SD with start valve indications 2. Connects FADEC to the electrical System 3. Commands packs valves closed for 30 seconds 4. Activates continuous ignition WHEN Cycled from the NORM position C. CRANK - only permits the rotation of The engine (dry crank) 1. No fuel or ignition 2. MAN START pbs must be used to open The respective start valve 3. FIRE (red) - illuminates when an engine fire has been detected 4. FAULT (Amber) - illuminates when A. Auto start has been aborted (FADEC start fault) B. A disagreement between the actual Position of the HP fuel valve and it’s Commanded position Note: there is no relationship between FIRE and FAULT indications. They are separate
55
Q

What is the purpose of the Engine Interface Computer(EIC)

A

It collects and transmits data to the FADEC used for engine management.

56
Q

When will the FADEC protect against EGT overexceedance?

A

Only during ground starts

57
Q

FADEC electrical power is provided by?

A

The aircrafts electrical system when the engine is not running and by a dedicated engine driven alternator when the engine is running.

58
Q

Does the FADEC detect a tailpipe fire.

A

No

59
Q

The CRANK position on the ENG MODE Selector is used for what and with what?

A
  1. To crank the engine without allowing and fuel to be supplied to the engines 2. Used with the ENG MAN START pbs to dry crank
60
Q

The blue arc on the N1 indicator means what?

A

Represents the difference between the current thrust output and the thrust commanded by the Autothrust system.

61
Q

The FADEC limits each engine start cycle to how long?

A

2 minutes

62
Q

How many generators has the APU?

A

One.

63
Q

When does the APU AVAIL appear green?

A

The APU AVAIL appears in green when APU N is above 95%.

64
Q

What is the basic element of the APU?

A

The basic element of the APU is a single-shaft gas turbine that delivers mechanical shaft power for driving the accessory gearbox (electrical generator starter etc.) and produces bleed air (engine starting and pneumatic supply).

65
Q

You switched the APU off. Why do you still have the APU AVAIL indications?

A

The APU will run for a cooling period because you have been using the APU bleed.

66
Q

The APU may be started up to which altitude?

A

The APU can be started at any altitude using normal aircraft electrical power.

67
Q

What is the purpose of the Electronic Control Box (ECB)?

A

The ECB is a full-authority digital electronic controller that performs the bulk of the APU system logic for all modes of engine operation such as: Sequences the start and monitor it monitors speed and temperature monitors bleed air sequences the shutdown and controls the automatic shutdown.

68
Q

What occurs in case of an APU fire with no crew in the cockpit?

A

APU fire warnings operate in the cockpit and in the nose gear bay the AVAIL light goes out the FAULT light comes on the APU shuts down and the APU fire extinguisher discharges.

69
Q

What is the purpose of the APU in flight?

A

In flight the APU backs up the electrical system and the air conditioning and it can be used to start the engines.

70
Q

How does the APU fuel system work?

A

The left fuel feed line supplies the APU. The required pressure is normally available from the tank pumps. If pressure is not available (batteries only or pumps off) the APU FUEL PUMP starts automatically. The ECB controls the fuel flow.

71
Q

What is the function of the APU GEN pushbutton located on the overhead electrical panel?

A

When selected to OFF the APU generator field is de-energized.

72
Q

How does the fuel supply work for the APU?

A

The left fuel feed line supplies the APU normally via the tank pumps. The APU FUEL PUMP starts automatically if pressure is not available (batteries only or pumps off).

73
Q

What is the highest altitude the APU can supply bleed air for engine start while providing electrical power?

A

20,000 Feet

74
Q

Does APU air or electric have priority?

A

Electric

75
Q

What does the green “AVAIL” light on the APU start pushbutton indicate?

A

The APU is available to provide electrical power and/or bleed air

76
Q

The APU generator can supply 100% electrical load to what altitude?

A

25,000 Feet

77
Q

What is the highest altitude the APU can supply bleed air to one pack while providing electrical power?

A

25,000 Feet

78
Q

What is the highest altitude the APU can supply bleed air to two packs while providing electrical power?

A

15,000 Feet

79
Q

What happens when the APU MASTER sw pushbutton is selected ON?

A
  • Electrically powers the APU system (Blue ON light in the pushbutton) - Electronic Control Box (ECB) performs a power up test - APU ECAM page appears (if EXT or ENG GEN AC power is available) - APU air intake flap opens - APU fuel isolation valve opens - APU fuel pump operates (if no tank pumps are on)
80
Q

With the APU green AVAIL light ON and the EXT PWR blue ON light illuminated, which system is powering the aircraft?

A

EXT PWR

81
Q

What happens when you push the APU START pushbutton?

A
  • Blue “ON” light illuminates - When APU air intake flap opens the starter is energized - Ignition is turned ON 1.5 seconds after starter is energized - Starter is de-energized and ignition turned off at 55% N - Blue “ON” light in start button extinguishes - Green “AVAIL” light illuminates 2 seconds after 95% N or above 99.5% N - APU page disappears from the ECAM 10 seconds later
82
Q

With the APU green “AVAIL” light ON and the EXT PWR green “AVAIL” light on, with system is powering the aircraft?

A

APU

83
Q

With the APU running and supplying bleed air, how do you shut it down?

A
  • APU BLEED pushbutton OFF - APU MASTER sw OFF - APU will cool down and then shut down
84
Q

If a mechanic pressed the APU AUTO EXTING TEST pushbutton, what would occur?

A

The APU will shut down

85
Q

During the cool down cycle can you still use the APU?

A

Yes, press the APU MASTER sw pushbutton

86
Q

What does an amber “FAULT” light in the APU MASTER sw pushbutton indicate?

A

An ECB commanded auto shutdown of the APU has occurred

-x- A320 stuff from other decks -x- (5 decks)

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