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Boeing 757 Technical > Engines > Flashcards

Engines Flashcards

1
Q

Engine description and thrust?

A

RR RB211-535E4-B

42700lbs

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2
Q

What rotor drives the accessory gearbox?

A

N3

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3
Q

What is the primary control for the engines using either the autothrottles or manual pilot throttle inputs?

A

The Electronic Engine Controllers (EECs)

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4
Q

What are the three primary engine indications?

A

EPR, N1, and EGT

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5
Q

What is the amber (maximum continuos) inhibit for EGT, N1, N2, and N3 indications during takeoff or go-around?

A

Inhibited for 5 minutes

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6
Q

Are the red line limits inhibited during take off or go-around for EGT, N1, N2, or N3?

A

No

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7
Q

When does compact mode automatically occur?

A

On failure of one of the EICAS CRTs

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8
Q

Which system calculates maximum EPR for all phases of flight? What about when that system is OFF or INOP?

A

EEC, or alternatively the TMC

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9
Q

With the EEC on what happens when thrust levers moved to the forward stop position?

A

Maximum calculated EPR will be maintained

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10
Q

What does green and amber REV indication mean?

A

Green means the reverser is fully deployed and amber means the reverser is unlocked or in transit

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11
Q

What does the TMC calculate reference EPR from for the various modes? What are the modes? (8)

A

Based on pressure altitude and ambient temperature

TO, D-TO, CLB, CLB1, CLB2, G/A, CRZ, CON

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12
Q

Two places to enter an assumed temperature?

A

Through either the TMSP or the CDU TAKEOFF REF page

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13
Q

When MAN is set on the TMSP what default manual EPR value is first indicated?

A

1.55 EPR

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14
Q

When in VNAV does the FMC control the thrust modes automatically?

A

Yes

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15
Q

Can the FMC set reduced thrust climb values?

A

No, must be done manually

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16
Q

What is assumed temperature takeoff limited to? (2)

A

25% reduction of takeoff thrust or climb thrust - whichever is greater

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17
Q

How know when max assumed temperature is reached?

A

When dialling in a greater temperature on the TMSP or on CDU TAKEOFF REF page does not changed the displayed assumed temperature or reference thrust value

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18
Q

What % of thrust does climb 1 give?

A

94%

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19
Q

What amount of thrust does climb 2 give?

A

Enough to meet a min single engine climb gradient, increasing to 88% when flaps 1 selected or above 3000ft AGL or 10000ft AMSL

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20
Q

Two types of thrust control systems?

A

EECs and hydromecnanical

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21
Q

When the EECs are turned off what controls thrust?

A

Hydromechanical engine fuel control

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22
Q

What powers the EECs?

A

Each EEC is powered by dual dedicated generators

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23
Q

Why should the thrust lever be moved to a mid point position when turning an EEC off?

A

To prevent a possible engine overboost because under normal operations the EECs trim a bit of fuel from the hydromecnanical fuel control system

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24
Q

What does ELC do?

A

Prevents engine limits being exceeded by taking fuel away

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25
Q

Why take thrust lever to mid point before turning ELC off?

A

Prevent possible overboost as any trim level held by ELC comes out when turned off

26
Q

How ELCs powered?

A

Each ELC powered by dual dedicated generators

27
Q

What are the two channels of the EECs? What do they do?

A

Supervisory Channel - Provides EPR overboost protection

Limiter Channel - provides N1 overspeed protection

28
Q

Is there N2 overspeed protection?

A

No

29
Q

Wha provides N3 overspeed protection?

A

Fuel control unit

30
Q

Two different idle settings?

A

Minimum idle and approach idle

31
Q

What drives the engine starter?

A

Pneumatic air

32
Q

How long does the engine EGT start limit remain indicated during engine start?

A

Until the engine has stabilised at idle

33
Q

What two things does fuel controls switches control?

A

Fuel and ignition

34
Q

What rotor is the engine starter connected to?

A

The N3

35
Q

What does the VALVE light indicate on start?

A

The start valve failed to open

36
Q

When add fuel during engine start?

A

25% N3 or max motoring rpm

37
Q

When is max motoring rpm reached?

A

When N3 acceleration is less than approx 1% in 5 seconds

38
Q

What fuel valves does the fuel control switch operate?

A

The spar and engine fuel control valves

39
Q

When does start selector move back from GND to AUTO during start?

A

AT approx 47%

40
Q

What does L or R STARTER CUTOUT during start mean?

A

Start valve has failed to close automatically so need to move start switch to off to close the starter

41
Q

When is rich start used?

A

Cold starts and in flight starts when EGT is zero

42
Q

Starter cycle limits?

A

Up to 2 min - then Zero N3
Up to 2 min - then Zero N3
Up to 2 min - then Zero N3 and 15 min cool down time

43
Q

Recommended N3 re-engagement speed? (2)

A

0% N3 recommended

0-20% N3 Normal

44
Q

Recommended re-engagement above 20% N3 not recommended except in case of?

A

Fire

45
Q

Re-engagement above 30% N3 may result in?

A

Damage to starter or gearbox

46
Q

Main and back up power sources for the engine ignition system?

A

Main AC = primary

Standby AC = backup

47
Q

How is the fuel heated?

A

Through a fuel/oil heat exchanger

48
Q

What are the system components in order of the engine fuel system from manifold to engine? (8)

A

Spar valve - First stage pump - Fuel/Oil Heat exchanger - First Filter - Second stage pump - Fuel control unit (with trim motor from EEC and ELC) - Engine Valve - Fuel Flow Meter - Second Fuel Filter

49
Q

What controls both the engine and spar fuel valves? (2)

A

Both the fuel control switch and the fire handles

50
Q

Is there a bypass for the first fuel filter?

A

Yes

51
Q

How is a fuel bypass (first fuel filter) situation indicated?

A

L or R ENG FUEL FILT on EICAS

52
Q

Where is oil temperature measured?

A

After it leaves the engine before it goes back into the oil resevoir

53
Q

Can the main oil filter be bypassed and what indication it is clogged?

A

No. EICAS = L or R OIL FILTER

54
Q

Can the scavenge oil filter be bypassed?

A

Yes

55
Q

Are there any limits for oil quantity or flight crew procedures?

A

No

56
Q

How reverse thrust actuated?

A

Hydraulically

57
Q

The revers thrust levers can only be raised when the thrust levers are in what position?

A

Idle

58
Q

What two other things automatically occur when thrust levers moved to idle?

A
  1. Autothrottle disengages (warnings inhibited during autoland)
  2. Autospeed brakes deploy (for RTO - deploy when set to auto on landing via other means)
59
Q

Thrust levers cannot be moved forward until reversers are?

A

stowed and locked

60
Q

What does L or R REV ISLN VAL on EICAs mean?

A

Fault exists in the reverser system. If detected above 80kts it is inhibited until after landing

Boeing 757 Technical (16 decks)

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