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B737-700 NG Systems > Engines > Flashcards

Engines Flashcards

1
Q

The N1 rotor consists of what three items?

A
  1. N1 Fan
  2. Low pressure compressor (booster)
  3. Four-Stage low pressure turbine
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2
Q

What is the primary (used for combustion) vs. bypass air split?

A

20% primary / 80% bypass

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3
Q

The N2 rotor consists of what two items?

A
  1. The Nine-stage HP compressor
  2. High Pressure single-stage turbine
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4
Q

The accessory drive is powered (i.e. turned) by what?

A

The high pressure turbine

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5
Q

What items are on the accessory drive?

A
  1. Oil Scavenge Pump
  2. Engine Fuel Pumps
  3. IDG (Integrated Drive Generator)
  4. Starter
  5. Hydraulic Pump
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6
Q

What powers the EEC’s ?

A

Dedicated engine-driven alternators that are independent of the airplane’s electrical system

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7
Q

T/F: The ENGINE CONTROL Lights only operate on the ground and illuminate when there are engine control system faults.

A

True

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8
Q

When does the EEC set Approach Idle in flight?

A

When the flaps are in the landing configuration or if engine anti-ice is ON for either engine.

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9
Q

The reverse thrust lever is blocked at the Interlock position until the __________ have approached the deployed position.

A

reverser sleeves

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10
Q

What happens when the Engine Start Levers are placed to IDLE during engine start?

A
  1. The ignition system is energized through the EEC
  2. The spar fuel and engine fuel shutoff valves are electrically opened to introduce fuel
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11
Q

The left ignitor plug receives power from ?

A

Associated AC Transfer Bus

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12
Q

The right ignitor plug receives power from?

A

The AC Standby Bus (For this reason, if an engine is started with battery power only, the right igniter must be selected)

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13
Q

T/F: The EEC turns on the ignition system automatically if the EEC senses a possible engine flameout condition.

A

True

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14
Q

When should Engine Ignition be on?

A
  1. Takeoff
  2. Landing
  3. Operation in Heavy Rain
  4. Anti-Ice operation
  5. Severe turbulence
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15
Q

The engine starting system uses ________ to turn the engine’s N2 rotor during a start

A

pneumatic power

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16
Q

What minimum N2 value should be observed before placing the start lever to IDLE?

A

20 % N2 (25% is recommended)

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17
Q

What is the definition of Max Motoring (N2) ?

A

N2 acceleration less than 1% rise in approximately 5 seconds

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18
Q

What is starter cutout speed?

A

Approximately 56% N2

19
Q

What happens at Starter Cutout speed?

A

The ENGINE START switch automatically returns to OFF, the bleed air valve opens, and the start valve closes.

20
Q

What is considered a Wet Start?

A

A wet start occurs if the EGT does not rise after the Start Lever is moved to IDLE.

21
Q

T/F: The EEC provides the same start protection during in-flight starts as it does for ground starts.

A

False

22
Q

T/F: Taxi operations, at or near idle, apply to the engine cool down times

A

True

23
Q

The EEC is comprised of what two channels?

A

Active & Standby

24
Q

If the EEC normal mode is not available, the EEC downgrades to what mode?

A

Soft alternate mode

25
Q

Placing the ENGINE START switch to FLT provides ignition to _________

A

both ignitors

26
Q

The N1 Fan and booster combined act as a _________ compressor

A

4 stage

27
Q

The thrust reversers can be deployed when either radio altimeter senses less than _____ altitude, or when the _________ is in ground mode

A

10 feet; air/ground sensor

28
Q

The EGT readout will blink on and off when…

A

EEC senses a condition that may lead to a hot start

29
Q

Each engine has ______ igniter plugs that operate ____________

A

2; independently

30
Q

The _____________ lights only operate ____________ and indicate that the aircraft is not to takeoff due to engine control system malfunctions.

A

ENGINE CONTROL; on the ground (below 80kts prior to t/o; or ~30 seconds after touchdown)

31
Q

The EEC uses N1to set thrust in one of what 2 modes?

A

Normal & Alternate

32
Q

At the same airspeed and altitude, N1 and N2 RPM will be _______ for approach idle than for flight minimum idle.

A

higher (reduces engine acceleration time in the event of a go-around)

33
Q

During ground starts, the EEC monitors engine parameters to detect:

A
  1. Impending hot starts
  2. EGT start limit exceedances
  3. Wet starts
34
Q

What kind of engines does the B737 have?

A

CFM56-7 high bypass, dual rotor, axial flow turbofan engines

35
Q

The EEC interfaces with which engine components?

A

Hydromechanical Unit (fuel metering), Engine Air control systems (stator vanes and bleed air valves), Fuel flow transmitters, Ignition & Starting systems, Thrust Reversers

36
Q

Both ON and ALTN are visible on the EEC Switch. What mode is the EEC in?

A

It has automatically switched to the Soft Alternate mode.

37
Q

What are two ways of manually selecting the Hard Alternate mode on the EEC?

A
  1. Retarding the thrust lever to idle when in the soft mode
  2. Manually selecting ALTN on the EEC switch
38
Q

What is the difference between the Hard alternate and Soft alternate modes of the EEC.

A

The Hard mode will always provide greater than or equal to thrust than the normal mode. The Soft simply uses the last valid flight conditions to define engine parameters.

39
Q

T/F: The reverse thrust lever is blocked at the interlock position until the reverser sleeves have approached the deployed position

A

True

40
Q

What conditions must be met for the reverse thrust lever to be used?

A

The forward thrust lever must be in the full idle position, with the radio altimeter less than 10 feet or air/ground sensor in the ground mode.

41
Q

Regardless of Ignition Selector switch position, placing the ENGINE START switch to ___________ provides ignition to both igniters continuously

A

FLT (flight)

42
Q

How are the left and right ignitor plugs powered?

A

Left - associated AC Transfers Bus
Right - AC Standby Bus (Right ignitor must be selected when starting with battery power only)

43
Q

What happens when starter cutout speed (~56% N2) is reached during an engine start?

A

The ENGINE START switch automatically returns to OFF, the bleed air valve opens, and the start valve closes

B737-700 NG Systems (23 decks)

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