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AJX Study > Engines > Flashcards

Engines Flashcards

1
Q

What are the engines?

A
  • GE CF6-80C2B6?
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2
Q

In AUTO when does the standby engine indicator automatically display?

A
  • AC power is lost or:
  • EICAS failed
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3
Q

Explain EEC minimum IDLE mode

A
  • Lower thrust
  • Most phases of flight
  • All ground Operations
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4
Q

Explain approach Idle

A
  • Higher Thrust

Automatically selects when:

  • Anti-ice on or:
  • Flaps at LDG Flap until 5 sec after touchdown
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5
Q

Explain EEC NORMAL MODE

A
  • Compares commanded N1 to actual N1 and adjusts fuel flow to change engine speed until actual N1 is the same as commanded N1
  • Over speed, Over boost protection when thrust levers fully forward
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6
Q

Explain EEC ALTERNATE MODE

A
  • Schedules N1 as a function of thrust lever postion
  • Alternate mode N1 reference/target values are computed by the TMC
  • Alternte mode provides equal or greater thrust for same thrust lever position
  • Thrust protection not provided, overboost can occur, EN LIM PROT displays if trust lever postion commands greater than reference N1
  • N1 & N2 red line proctection still available
  • SOFT
    • When the EEC automatically switches an engine to the alternate mode and the EEC mode switch remains in NORM
    • At a fixed thrust lever position, thrust does not change
  • HARD
    • When ALTN is manually selected on an EEC mode switch, that engine is switched to the hard alternate mode
    • Thrust may change to set the commanded N1 when ALTN is manually selected
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7
Q

What happens when the fuel control switch is moved to cutoff?

A
  • Spar & Eng valves close
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8
Q

What does the N2 magenta bug indicate?

A
  • Min N2 to put fuel in (Fuel on bug)
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9
Q

When can an inflight windmill start be used?

A
  • When there is no x-bleed display above the N2 indicator
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10
Q

What will display if a X BLD start should be initiated in flight?

A
  • X BLD above N2 and a fuel on bug
  • Displayed when airspeed is lower than that required for a windmill start
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11
Q

What does the Thrust mode selector use?

A
  • Configuration
  • Engine
  • Operation
  • Conditions
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12
Q

What rotor drives the engine accessory gear box?

A
  • N2 rotor
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13
Q

When are the secondary Engine indications automatically display?

A
  • Initially receiving electrical power or:
  • A secondary engine parameter is exceeded
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14
Q

What gauges have a caution range and what happens?

A
  • Oil temp & Oil press
  • Have caution ranges displayed by Amber bands
  • If reach the range the digital readout, readout boxes and pointer all change colour to Amber.
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15
Q

What gauges have operating Limits?

A
  • N1, EGT, N2, Oil press & Oil temp have operating limits indicated by red lines
  • If one of these indications reaches the red line the digital readout, box and pointer all change colour to RED
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16
Q

What does EGT guage have?

A
  • Maximum continuous, indicated by an amber line
  • If reaches this the box, dial & pointer all turn AMBER
  • Inhibited during takeoff and go around for 5 minutes
  • Also has Max takeoff limit indicated by a red line
  • All turns red if reached
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17
Q

What does N1 limit do?

A
  • Indicated by an Amber line on the dial but does not change colour when max N1 is reached
18
Q

What is the Derate for Takeoff 1 & 2?

A
  • Takeoff 1 (300)- 95%. (300ER,F)- 90%Takeoff 2 (300)-85%. (300ER,F)- 80%
19
Q

When will Derates thrust remain until?

A
  • ABV 10,000ft Derates thrust gradually changes to reach full CLB thrust by:
  • (300) 12,000ft. The 1 or 2 annunciation disappears from the display by 12,500ft
  • (300ER,F) 30,000ft. The 1 annunciation disappears by 30,500ft The 2 annunciation remains until either flaps are extended or GA
20
Q

What are the engines covered for by the EEC in normal mode?

A
  • N1, N2 protection but no EGT protection
21
Q

EEC Soft mode

A
  • Auto switches to this mode when switches in NORM
  • Thrust will be fixed and will not change
22
Q

Hard Alternate mode

A
  • ALTN is manually selected on the EEC mode switch
  • Reference, target and maximum commanded N1 values are displayed on the N1 indication
23
Q

What protection is provided in the ALTN modes

A
  • Thrust protection not provided and maximum rated thrust is reached at a thrust lever position less than full forward. As a result thrust overboost can occur at full forward thrust lever positions
  • N1,N2 redline protection is still available in the ALTN control mode.
24
Q

What are the two idle speeds and when are they selected

A
  • Minimum Idle: lower thrust setting used for for ground ops and all stages of flight except approach & landing
  • Approach Idle: selected whenever the higher idle setting is required for proper system operation.EEC AUTOMATICALLY SELECTS IDLE SPEEDS
25
Q

What is displayed on the EGT during start

A

Maximum start line limit, displayed until engine is stable

26
Q

Starter duty cycle

A
  • Five minutes on, followed by 30 seconds off per minute on
27
Q

When does the in flight start envelope display on the primary display and what does it indicate?

A
  • ENG is not running in flight
  • Respective Fire SW not pulled
  • Both EICAS prim & sec are selected
  • Displays closest starting FL and two descending FL’s at 2000ft intervals as well as air speed range
  • X-BLD displayed above N2 and fuel on bug displayed if airspeed below windmilling start speed
28
Q

Auto relight?

A
  • In air or on ground, automatic relight feature is enabled if N2 drops below idle SPD
  • EEC energizes both ignition systems
29
Q

When do the Engine and Spar valves open?

A

When the fuel CONT switch is in the RUN position and the ENG fire SW is in.

30
Q

Where is fuel flow measured from?

A

After passing through the engine fuel valve.

31
Q

Where is the oil temp measured from?

A

After leaving the scavenge pump, prior to entering the second filter.

32
Q

Is there a minimum oil quantity limit?

A

There’s is no min oil quantity limit, (no amber or red line)

33
Q

What happens when the reverses are pulled aft to the interlock position?

A
  • A/T disengages
  • Auto speed brakes deploy
34
Q

Is oil quantity displayed in litres or quarts?

A

Quarts

35
Q

When should the engine start selector move from GND to AUTO during an engine start?

A

50% N2

36
Q

With the ENG start selectors in AUTO when will the selected igniters continuously operate?

A

With slats extended or ENG anti ice on

37
Q

Is there a time limit to continuous ignition or flight ignition?

A

No time limit

38
Q

What is the purpose of selecting FLT on the ENG start selectors following a loss of dual engine failure?

A

FADEC- Auto relight which will operate both igniters when N2 drops below idle speed.

39
Q

When is the red EGT start limit line of 750degrees displayed when on the ground?

A

Fuel control SW is in cut off position, remains displayed when fuel CONT SW is moved to RUN until the engine is stabilised at idle (FADEC- 10sec after N2 reaches 60%) (NON-FADEC- 5 sec after N2 reaches 60%)

40
Q

What happens when the Fuel CONT SW is positioned to RUN?

A

Opens ENG & SPAR valvesActivates selected igniters

41
Q

Can autothrottle sill remain engaged in EEC hard and soft modes?

A

Yes

42
Q

What does pulling up the reversers do?

A
  • Disengages Autothrottle
  • Deploys speed brakes if in down position

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