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B38M Tech > Aircraft General/Eng/Fuel/APU > Flashcards

Aircraft General/Eng/Fuel/APU Flashcards

1
Q

MTW and MTOW?

A

MTW - 82,417kg
MTOW - 82,190kg

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2
Q

MLW?

A

69,308kg

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3
Q

MZFW?

A

65,952kg

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4
Q

Side length dimensions?

A

Length - 39.47m
Nose to nose gear - 4.01m
NLG to MLG - 15.60m

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5
Q

Wingspan dimensions?

A

Wingspan - 35.9M
Horizontal stab - 14.36m
Gear Width - 5.72m

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6
Q

Minimum taxiway width for 180 degree turn?

A

24.4m

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7
Q

Galley electrical power?

A

115v at 400Hz

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8
Q

What external & cockpit lights are powered from Battery Bus?

A

Position lights, dome, standby compass light and instrument flood lights.

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9
Q

What are the emergency lights powered by, and how long do they last?

A

NiCad Batteries charged by 28V DC BUS. Last for 20 minutes. (NOT ARMED light will illuminate if ON)

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10
Q

How do you shut off crew oxygen?

A

Pressing RESET/TEST button when doors are closed. Closing left panel door disables mask mic.

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11
Q

What altitude do cabin oxygen masks drop?

A

14,000ft

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12
Q

How long does cabin oxygen lasts, and what pressure are they charged too?

A

12 minutes, 1800PSI (slightly less than cockpit).

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13
Q

What are the 4 APU indicating lights?

A

DOOR, LOW OIL PRESSURE, FAULT and OVERSPEED.

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14
Q

How long does FAULT and OVERSPEED light stay illuminated after APU shutdown?

A

5 minutes after OFF.

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15
Q

What causes APU DOOR light to illuminate? (3)

A
  • shutdown & door still open
  • Inflight and not in flight position (17^) at liftoff
  • Ground and not in ground position (45*)
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16
Q

What altitudes can the APU operate too? (3)

A

FL100 - Bleed + Electric
FL170 - Bleed
FL410 - Electric

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17
Q

What power is used to start the APU? (3)

A

AC. AC XFR BUS1 or BATT.

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18
Q

When will the APU GEN OFF BUS illuminate?

A

Once APU RPM above 95%. Once one selected on powers both AC XFR Buses through BTB, and illuminates other SOURCE light.

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19
Q

What controls APU speed?

A

Electronic Fuel Control Unit. 400Hz.

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20
Q

What happens when the APU EGT gets too hot? (Before start, during start, inflight)

A

Load sheds. During start, electrical load shed before bleed air. Any other time, bleed is reduced by Compressor Variable Guide Vanes before Electrical.

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21
Q

What will happen to APU if the Battery is switched off?

A

APU will shutdown both on ground and inflight.

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22
Q

When will the APU automatically shutdown? (5)

A

LOW OIL PRESSURE
FAULT light - fuel valve not shut in 30 seconds.
TURBINE OVERSPEED
FIRE WARNING
BATT Switch OFF

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23
Q

How do the boost pumps ensure redundancy?

A

Two per tank, powered by separate AC XFR BUS’s.

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24
Q

Can centre tank feed main tanks?

A

Centre tank can scavenge into Main Tank 1 if FWD pump on and Tank 1 is under half full.

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25
Q

Where is NGS air supplied from?

A

Supplied by bleed air from left side of pneumatic manifold.

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26
Q

What sensors does the NGS controller use? (3)

A
  • Altitude Sensor
  • Differential Pressure
  • Airplane systems
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27
Q

What causes FUEL master caution to illuminate? (Pump) (2)

A

Both individual main tank fuel pumps indicating low pressure. If only one, illuminates on RECALL, unless it’s the only pump ON.

Centre tank, 1 LP light will illuminate master caution after 10 seconds.

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28
Q

What is crossfeed valve powered from?

A

Powered by BATT BUS.

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29
Q

Maximum fuel imbalance?

A

453kg

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30
Q

At what quantity will INSUFFICIENT FUEL illuminate?

A

900kg and below at destination.

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31
Q

What are spar-valve SOV and Engine Fuel SOV powered by?

A

Spar-Valve - DC powered HOT BATT BUS.
Engine Fuel - BATT BUS (fuel pressure operated but solenoid controlled)

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32
Q

Where is the Fuel Tank temperature indicator? What are the max/min fuel temperatures?

A

Main tank no.1.

Max - 49 degrees
Min - -43 or 3 degrees above freezing point of fuel used.

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33
Q

When will fuel LOW illumination appear on PEID? When will this extinguish?

A

Fuel quantity less than 907kg in either tank. (Inhibited on ground)
Extinguish once refuelled above 1134kg.

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34
Q

When would CONFIG appear on fuel display? (Centre tank)

A

One engine running and BOTH centre tank pumps OFF, and quantity above 726kg.

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35
Q

When would CONFIG extinguish with regards to centre tank pumps? (3)

A
  • One centre pump on
  • Both engines shutdown
  • Centre tank quantity under 363kg
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36
Q

When would IMBAL appear? When would it extinguish?

A

Main tanks difference of 453kg

Continues until on ground or imbalance below 91kg.

Inhibited by LOW indication

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37
Q

Maximum fuel tank quantities?

A

Main tanks: 3,869kg
Centre tank: 12,990kg

Total: 20,728kg

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38
Q

What powers fuel quantity and valves?

A

DC from HOT BATT BUS

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39
Q

What pumps can directly feed to manual defuel/transfer valve? (3)

A

Main tank no.2 & right pump in centre tank.

40
Q

What calculates N1 limits inflight, using what information?

A

FMC, using TAT.

41
Q

What displays if FMC is unable to calculate N1 limit?

A

A/T Lim. Indicates a single degraded N1 limit being calculated from EEC.

42
Q

What will happen if thrust is more/less than commanded?

A

N1 arc will turn Amber & flash for 10 seconds, then THRUST steady illuminated.

Blinking inhibited 80kts to 400’ RA, or 200’ RA until 30 seconds after landing.

43
Q

What does the amber maximum N1 value represent?

A

N1 value for full rates thrust, computed by EEC.

44
Q

When does N1 dial go red?

A

Maximum operating N1 exceeded.

Red returns after shutdown.

45
Q

When will the temporary red maximum on the EGT extinguish on start?

A

66%N2 RPM

46
Q

What marks does the engine EGT have after start? (2)

A

Red - Max EGT
Amber - Max CONT EGT

47
Q

When will EGT illuminate Amber?

A

If maximum CONT EGT exceeded for 5 minutes.

48
Q

When will the Amber ENG FAIL on EGT illuminate? When will it extinguish? (3)

A

N2 falls below 63%.

  • back above 63%
  • start lever cutoff
  • engine fire switch pulled
49
Q

When will secondary engine indications display on MFD? (4)

A
  • Power initially applied to system.
  • ENG selected to MFD
  • Secondary indication exceeds normal range
  • Inflight when engine fails or start lever cutoff.
50
Q

Does N2 have an Amber range?

A

No

51
Q

When does fuel used reset? (2)

A
  • When electrical power removed
  • Switch moved to reset
52
Q

What indication illuminates with low oil quantity?

A

LO indicates next to dial.

53
Q

What is fuel controlled by? (2)

A

HMU & EEC, from a thrust request.

54
Q

Can the HMU function independently of the EEC?

A

No. EEC meters fuel through HMU.

55
Q

How many channels does the EEC have, and how do they operate?

A

Two channel computer (A+B). Independent and connected to identify failures.

Chooses one as active, changes on each start.

56
Q

What powers the EEC?

A

Powered by AC XFR BUS1 until 15%N2. After, dual redundant EEC generators.

57
Q

What modes does the EEC have? (3)

A
  • Normal - sensed flight conditions.
  • Soft Alternate - EEC automatically selects ALT mode. Uses last known flight conditions.
  • Hard Alternate - ALT mode manually selected, or AUTO when EEC selects ALTM and thrust levers are at idle.
58
Q

What is hard alternate thrust equal too?

A

Equal to greater than normal thrust for same lever position. Max thrust could be exceeded.

59
Q

What does ALT mode selection illuminate? (2)

A

Master Caution & ENG. ALTN lights on EEC switch.

60
Q

What does EEC provide protection too?

A

Redline protection to N1 and N2 in all modes.

61
Q

What doesn’t EEC provide protection too?

A

No EGT protection.

62
Q

What is Thrust Control Malfunction Accommodation (TCMA)?

A

EEC function that protects against high asymmetric thrust on GROUND. Shuts off fuel flow to affected engine.

63
Q

What is Electronic Overspeed Protection (EOS)

A

Protection against exceedance of engine structural design. Detects uncontrollable N2 speed, shuts off fuel to affected engine.

64
Q

When will Amber REVERSER COMMAND light illuminate?

A

If reverse lever not down inflight.

65
Q

When will ENGINE CONTROL illuminate? When is it inhibited?

A

Faults that cannot be dispatched. Inhibited inflight.

66
Q

What does REVERSER LIMITED mean?

A

Fault in reverser system. Reverse will either not deploy or be limited to idle on landing.

67
Q

How many fuel pumps in engine, and where?

A
  • After Spar SOV, N2 accessory fuel pump.
  • After filter then onto HMU.
68
Q

What is engine oil displayed as?

A

Quantity is shown as a percentage on the MFD.

69
Q

When is it normal for engine OIL PRESSURE to illuminate? (2)

A

When oil is warm, or engine at idle power.

70
Q

At what PSI will engine LOW OIL PRESSURE light illuminate?

A

13PSI.

71
Q

What are the igniters powered by?

A

IGN L powered by AC XFR BUS, IGN R powered by AC STANDBY BUS.

72
Q

How is the engine start valve controlled and operated?

A

Electrically controlled, pneumatically operated.

73
Q

How is starter powered?

A

Pneumatic

74
Q

What rotates N2 shaft during start?

A

Turbine starter

75
Q

When is normal starter cutout?

A

63%N2

76
Q

Can you start without AC power?

A

Yes, must hold GRD in position until 63%N2.

77
Q

How do you stop a wet start?

A

IGN OFF & Fuel Cutoff, 15 seconds after start lever idle. (NO EGT RISE)

78
Q

What does EEC provide protection against during start? (3)

A

Hot start, EGT start limit & wet starts. If EGT exceeds maximum, auto shuts off ignition & fuel SOV.

79
Q

When is reversers selectable? (2)

A

Below 10’ RA (on one), or air/ground sensor on ground.

80
Q

What is the reverse auto-stow system?

A

Opens ISOL valve inflight and moves control valves to stow. Hydraulically held until on ground.

81
Q

What can cause master caution when selecting reverse on landing?

A

Pause of 8 seconds after moving levers past first detent. Prevents further deployment.

MAINT light 30 seconds after landing.

82
Q

Above what level is APU not guaranteed to start?

A

FL250

83
Q

For what can an IDG automatically disconnect from engine?

A

High oil temperature.

84
Q

Can APU warn of an overheat?

A

No, only fire.

85
Q

Actual fuel totals? TUI

A

Main tanks 3915kg
Centre 13066kg

86
Q

Where are all fuel pumps located?

A

Centre tank

87
Q

What type of power are the fuel pumps powered by?

A

AC power

88
Q

What thrust rating are the LEAP-1B?

A

27K

89
Q

What is the TO thrust time limit?

A

5 or 10 minutes

90
Q

What is the maximum assumed thrust reduction? (%)

A

25% of full or derated thrust

91
Q

When is ATM prohibited? (4)

A
  • Contaminated runway
  • EEC in alternate mode
  • Windshear risk
  • Anti-skid INOP
92
Q

When will Amber EGT colour change happen?

A

Inhibited for 5 minutes after exceedance. If OEI, 10 minutes if OEI in first 5 minutes.

93
Q

What is the maximum starter duty cycle?

A

3 minutes, with 10 seconds between attempts.

94
Q

Where would you not get EGT protections for starting engines?

A

Inflight

95
Q

What flap setting causes approach idle to activate?

A

F15 and above.

96
Q

Above what amount of fuel is CSFF a possibility after arrival?

A

4000kg

B38M Tech (5 decks)

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