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Boeing 757 Technical > Engines > Flashcards

Flashcards in Engines Deck (60):
1

Engine description and thrust?

RR RB211-535E4-B
42700lbs

2

What rotor drives the accessory gearbox?

N3

3

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

The Electronic Engine Controllers (EECs)

4

What are the three primary engine indications?

EPR, N1, and EGT

5

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

Inhibited for 5 minutes

6

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

No

7

When does compact mode automatically occur?

On failure of one of the EICAS CRTs

8

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

EEC, or alternatively the TMC

9

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

Maximum calculated EPR will be maintained

10

What does green and amber REV indication mean?

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

11

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

Based on pressure altitude and ambient temperature
TO, D-TO, CLB, CLB1, CLB2, G/A, CRZ, CON

12

Two places to enter an assumed temperature?

Through either the TMSP or the CDU TAKEOFF REF page

13

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

1.55 EPR

14

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

Yes

15

Can the FMC set reduced thrust climb values?

No, must be done manually

16

What is assumed temperature takeoff limited to? (2)

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

17

How know when max assumed temperature is reached?

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

18

What % of thrust does climb 1 give?

94%

19

What amount of thrust does climb 2 give?

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

20

Two types of thrust control systems?

EECs and hydromecnanical

21

When the EECs are turned off what controls thrust?

Hydromechanical engine fuel control

22

What powers the EECs?

Each EEC is powered by dual dedicated generators

23

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

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

24

What does ELC do?

Prevents engine limits being exceeded by taking fuel away

25

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

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

26

How ELCs powered?

Each ELC powered by dual dedicated generators

27

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

Supervisory Channel - Provides EPR overboost protection
Limiter Channel - provides N1 overspeed protection

28

Is there N2 overspeed protection?

No

29

Wha provides N3 overspeed protection?

Fuel control unit

30

Two different idle settings?

Minimum idle and approach idle

31

What drives the engine starter?

Pneumatic air

32

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

Until the engine has stabilised at idle

33

What two things does fuel controls switches control?

Fuel and ignition

34

What rotor is the engine starter connected to?

The N3

35

What does the VALVE light indicate on start?

The start valve failed to open

36

When add fuel during engine start?

25% N3 or max motoring rpm

37

When is max motoring rpm reached?

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

38

What fuel valves does the fuel control switch operate?

The spar and engine fuel control valves

39

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

AT approx 47%

40

What does L or R STARTER CUTOUT during start mean?

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

41

When is rich start used?

Cold starts and in flight starts when EGT is zero

42

Starter cycle limits?

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

Recommended N3 re-engagement speed? (2)

0% N3 recommended
0-20% N3 Normal

44

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

Fire

45

Re-engagement above 30% N3 may result in?

Damage to starter or gearbox

46

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

Main AC = primary
Standby AC = backup

47

How is the fuel heated?

Through a fuel/oil heat exchanger

48

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

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

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

Both the fuel control switch and the fire handles

50

Is there a bypass for the first fuel filter?

Yes

51

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

L or R ENG FUEL FILT on EICAS

52

Where is oil temperature measured?

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

53

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

No. EICAS = L or R OIL FILTER

54

Can the scavenge oil filter be bypassed?

Yes

55

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

No

56

How reverse thrust actuated?

Hydraulically

57

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

Idle

58

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

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

59

Thrust levers cannot be moved forward until reversers are?

stowed and locked

60

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

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