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Type Rating > Engines, Fuel and Electrics > Flashcards

Engines, Fuel and Electrics Flashcards

1
Q

What does amber REV above N1 indicate?

A

Associated reverser not fully stowed (but not fully deployed) Should be < 10 secs, if >10 sec = MC and auto stow

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2
Q

If EGT is in red, what does this mean?

A

EGT limit has been exceeded

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3
Q

If pre-start there is a red box around the EGT, what does this mean?

A

On the previous trip there was an exceedance. The box will also show after shutdown

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4
Q

What are the primary engine instruments?

A

N1, EGT

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5
Q

When does an amber ‘ENG FAIL’ show on the EGT gauge?

A

<50% N2 and eng start lever (ESL) at idle detent

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6
Q

What will occult a ‘ENG FAIL’ warning?

A
  • ESL to CUTOFF
  • Engine recovers >50% N2
  • eng fire swx pulled
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7
Q

What does ‘START VALVE OPEN’ on the upper DU mean?

A

The start valve is open, air can be supplied to the starter. Normal to see up to around 56% N2

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8
Q

Amber ‘ENG CONTROL’ on o’head panel?

A
  • Not dispatchable
  • Operates up to 80kts or 30sec after landing.
  • Doesn’t illum in the air
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9
Q

If a secondary engine limit is exceeded in flight how is the crew notified?

A

The blanked lower DU will come up, individual warnings are then displayed on each parameter, either in red, amber or contrast inverted

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10
Q

What are the different modes of the EEC?

A
  • Normal. White ‘ON’ lights illuminated.
  • Soft fail. White ON and amber ALTN both illum with high TL position
  • Hard fail. White ON and amber ALTN with low TL position
  • Hard fail. Only amber ALTN illuminated
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11
Q

Which controls can be used to close the eng fuel shut off valve?

A

ESL or eng fire swx

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12
Q

During start when should eng start swx move to off?

A

Around 56% N2. If not automatically the FO can move the switch

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13
Q

During start when should you select the ESL to idle detent?

A

At 25% N2 (if hot and high N2 may stagnate lower, you can select idle above 20%)

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14
Q

You hear a click at 50% N2 on first start, is this the eng start swx going off early?

A

No the CVR switch pops from on back to auto at 50% N2 on the start of the first engine, eng start swx is at 56%

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15
Q

Indications of a wet start?

A

Fuel flow after ESL to idle but no EGT rise. After 15 sec the ac will auto shut off fuel flow.

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16
Q

When does the engine driven alternator provide enough power for self- sustained operation of the engine?

A

15% N2

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17
Q

What engines does the 737-800 have?

A

CFM-56

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18
Q

How is thrust produced by the engine?

A

80% from bypass air, 20% residual jet thrust

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19
Q

How many spools on the engine?

A
  • 2
  • N1 (1 x Fan, 3 x compressors, 4 x turbines)
  • N2 (9 x compressors, 1 x turbine)
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20
Q

Where is the gearbox driven from?

A

The N2 spool (hyd pumb, IDG, fuel pump, oil pump, hydromechancal unit, air starter)

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21
Q

Is there any over temp protection on start?

A

No, protection only kicks in after over temp, must be regulated by crew.

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22
Q

What must you wait for the N2 to decay to before dry cranking?

A

20% N2

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23
Q

How many channels does each EEC have?

A
  1. both channels are compared to a set of look up tables, if one differs from the other and the look up table, it is automatically swapped out of use
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24
Q

Which EEC channel does the engine normally start in?

A

It swaps between starts and is uncontrollable or monitorable by the crew.

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25
Q

What is the min oil level to start?

A

12

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26
Q

What does ‘OIL FILTER BYPASS’ mean?

A

Impending filter bypass, not that it has already bypassed. Follow QRH, scavenger pump filters saturated with contaminent, will need to reduce TL towards closed until caption extinguishes

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27
Q

What indications will you get with ‘LOW OIL PRESSURE’ on engine instruments and when?

A

10 sec flash on illuminate. The flash is inhibited between 80kts and 400ft but the caption will still come on.

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28
Q

Explain the eng start swx?

A

GND, air starter valve opened for start
OFF, auto ignition on L AND R igniter during flame out (<50% N2)
CONT, the selected igniter (L OR R) is permanently firing (selected for TO, lngd, heavy rain or icing conditions)
FLT, for in flt starting fires both L AND R igniters

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29
Q

If EGT is likey to exceed during start what is the indication?

A

A flashing white box around the temp digits

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30
Q

Can you trust the magenta X-BLD caption for relighting?

A

No, there is a table in the QRH, the X-BLD may illuminate in widmill areas

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31
Q

What is the VIB limit?

A

4

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32
Q

Can you operate in the amber band of the EGT?

A

Yes for up to 10 mins, after this it will go red and record an exceedance

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33
Q

If hyd A or B fail with the associated REV deploy?

A

Yes, but a t reduced speed (circa 50% slower than norma via stby hyd)

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34
Q

What triggers limit REV deployment?

A

WoW or RALT <10ft must be active to allow REV select

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35
Q

Is there any mechanical linkage to the engines from the throttle for reversionary operation?

A

No

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36
Q

How many idle settings?

A

Ground, flight & approach (flaps in land config or eng TAI selected) App idle is the highest to allow quick accel for GA

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37
Q

If the EEC has failed when is approach idle selected?

A

Below 15000ft, as flap lever and TAI correlation is unavailable without EEC

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38
Q

How can the AC trans BUSs be powered?

A

Eithe IDG, the APU or gnd power cart

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39
Q

What services are powered from the ground service BUS?

A

The battery chargers and servicing utilities (on gnd and in the air!)

40
Q

If IDG 2 fails how can AC trans BUS 2 be powered in flight?

A

Via both BTBs from AC trans BUS 1 (and IDG1) or via a single BTB from the APU

41
Q

With only 1 IDG running what load shedding occurs?

A

None by default, if it can supply the full load it will. First to be shed are the galleys, then the main AC BUSs

42
Q

If you disconnect an IDG in flt can it be re selected?

A

No (red covered switches are irreversable in flight)

43
Q

Normally where does DC BUS 1 receive power from?

A

TR1 ( but can be powered by TR 2 or 3 also)

44
Q

BUS TRANS swx OFF, where is the CBTR (cross BUS tie relay)?

A

Open (both BTBs are also open) isolating the 2 halves of the electric system

45
Q

BUS TRANS swx AUTO, where is the CBTR?

A

Closed, until ILS captured, then open to prevent double failure on apprach

46
Q

When is STBY PWR activated in AUTO?

A

AC trans BUS 1 and DC BUS 1 lose power

47
Q

How long does battery stby power last?

A

60mins if fuly charged (30 mins per batt), main batt will be partly discharged if an internal APU start was done

48
Q

How are the stby BUSs powered on the ground with no AC?

A

Battery

49
Q

What are norm and stby power supplies for the stby AC BUS?

A

Normal from AC trans BUS 1
Stby from the static inverter from the battery

50
Q

Can you parallel AC sources (have 2 AC sources on one BUS)?

A

No

51
Q

Can you parallel DC sources?

A

Yes

52
Q

APU altitude limits?

A

Electric load only, up to 41000ft
Bleed only, up to 17000ft
Electric and bleed, up to 10000ft

53
Q

How much fuel does the APU use?

A

Circa 70kg per hour

54
Q

If APU is your only AC source in flt, is there any auto load shed?

A

Yes, the galleys

55
Q

IDG 1 fails, you have IDG2 & APU providing AC, will there be auto load shed?

A

No, if the APU is only supplying one AC trans BUS it will keep the galleys

56
Q

How long does a fully discharged battery take to charge?

A

Circa 60 mins

57
Q

At the end of the charge cycle what does the battery charger do?

A

Runs a test dischsrge on the battery ‘BAT DISCHARGE’ amber if failed

58
Q

What actually powers the hot bat BUS in flight with no failures?

A

The battery charger(s), once the bat is charged the chargers supply DC

59
Q

What have you lost with STBY PWR OFF light?

A

Loss of power to any of: AC stby BUS, DC stby BUS or Batt BUS

60
Q

Meaning of blue APU GEN OFF BUS?

A

APU is available to be on the bus, but isn’t. (different logic to GEN OFF BUS)

61
Q

Meaning of blue GEN OFF BUS?

A

1 or 2 IDG is off the BUS, may or may not be in a position to provide power

62
Q

Batt voltage?

A

24V (batt charger 22-32 V)

63
Q

Normal AC?

A

115V, 3 phase, 400Hz, 90 KVA

64
Q

Is APU AC different to IDG output?

A

No, both IDGs and APU have same rating

65
Q

Where is the air starter mounted, what is it connected to?

A

Engine aux gear box, connected to N2 shaft

66
Q

What are the possible sources of power?

A
  • 2 x AC IDGs
  • 2 x DC Batteries
  • Extrenal AC connection
  • AC APU generator
67
Q

When is the switched hot batt BUS powered?

A

When the battery is charged and the batt swx is on

68
Q

Fuel x-feed selected open, caption stays bright blue?

A

Valve not open. (dim blue would be valve open, bright indicates opposite condition to the caption)

69
Q

How is a fuel imbalance shown, when,when does is go off?

A

> 453kgs between main (wing) tanks, amber IMBAL under the lower tank capacity gauge (IMBAL remains until <91kg difference)

70
Q

What does a fuel amber CONFIG warning mean?

A

Both ctr pumps off or low pressure, but with >726kgs in ctr tank

71
Q

Fuel gauging inop, how can you measure contents?

A

Drip sticks, 6 in each wing, 4 in the ctr tank, 16 total (a fuel gauge inop is dispatchable iaw the MEL CDL!)

72
Q

What 2 operations are achieved with the manual defueling valve?

A

Defuelling an transfer?

73
Q

How can you transfer fuel in the air?

A

You can’t

74
Q

How is the refuelling system powered not from the flt deck?

A

Opening the access door, or by an alternate switch inside the refuel access

75
Q

Which tank will feed first and why?

A

The ctr. The pumps are rated to a higher pressure

76
Q

If all fuel pumps fail is all fuel usable?

A

No ctr tank can only transfer by pump (remaining fuel is unusable), main tanks will gravity feed to respective engines

77
Q

Where is fuel temp measured?

A

Main tank 1 (left wing)

78
Q

What is and when does the ctr tank fuel scavenge jet pump (FSJP) operate?

A

When main tank 1 (left wing) fwd pump is on and tank 1 reduces to 50% capacity. Transfers any residual fuel from the ctr tank

79
Q

When does the Fuel Scavenger Jet Pump stop?

A

It doesn’t, keeps running until shut down

80
Q

What are the tank capacities?

A

3.9 - 13 - 3.9 approx (3915 and 13066 exactly)

81
Q

If ctr tank has >453kgs limit on main tanks?

A

They must be full

82
Q

Max and min fuel temp?

A

Max 49, min -43 deg C (or 3 deg above fuel freezing point)

83
Q

Max fuel for landing if you expect ‘non environmental icing’ (hoar frost due to cold fuel after rapid descent)

A

6000kg

84
Q

Max difference between calc and metered uplift before you have to do a manual check?

A

625 liters

85
Q

Min fuel in a main (wing) tank to swx on the hyd pumps?

A

760kgs

86
Q

With a Universal Fault Interrupter fitted how many ctr low pressure lights are required for a MC?

A

2 (normal boeing logic)

87
Q

With a Ground Fault Interrupter how many ctr low pressure light required for a MC?

A

1 (abnormal logic due to ctr tank explosion risk)

88
Q

Main tanks, how many low pressure lights required for a MC?

A

2

89
Q

Do the ctr tank low pressure lights remain on for the whole flight once empty?

A

No, occulted when pumps swx off (normal ops). Main tank low pressures will stay on with the pumps off

90
Q

What does the nitrogen generation system (NGS) do?

A

Generates nitrogen to mix with the air in the ctr tank to inert any fuel vapour

91
Q

Walk around checks for Nitrogen Generation System?

A
  • Blue or green light = good
  • Red or no light = bad (in the main wheel well)
92
Q

Where does APU get fuel from?

A

From the left fuel manifold. If no pumps on, will suction feed from the left main tank

93
Q

Which pumps do you use for the APU?

A

Some ac have a bespoke automatic fuel pump, but for fleet commonality you have to select a ctr or main 1 fuel pump on before starting the APU

94
Q

During cruise where is the CTBR?

A

Closed

95
Q

What is the meaning of the ENGINE CONTROL lights on the engine panel?

A
  • Aircraft on ground
  • eng running
  • issue with ECC
  • none dispatch
  • less 80knts
  • 30 sec after land

Type Rating (8 decks)

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