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B737 > POWERPLANT > Flashcards

POWERPLANT Flashcards

1
Q

For the first flight of the day, at airport elevations at or above 2000 feet MSL, if the
temperature is below 5°C/41°F, consider placing the Ignition select switch to?

A

For the first flight of the day, at airport elevations at or above 2000 feet MSL, if the
temperature is below 5°C/41°F, consider placing the Ignition select switch to BOTH
before starting the engines.

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2
Q

Thrust reductions are automatically removed by what altitude?

A

15000 ft

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3
Q

Reverse thrust lever is blocked at reverse idle position until related
thrust reverser is more than 60% deployed. True or False?

A

True

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4
Q

What all happens when you move the fuel control switch to idle?

A
  • energizes ignition system through EEC
  • electrically opens spar fuel shutoff valve in the wing leading edge outboard of the pylon
  • electrically opens engine–mounted fuel shutoff valve via the EEC.
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5
Q

What is the APU cooldown time once you place the switch to off?

A

60 secs

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6
Q

What all happens when you position an engine start switch to GRND position?

A
  • opens start valve
  • closes engine bleed valve
  • for ground starts, arms selected igniter(s) to provide ignition when engine
    start lever is moved to IDLE
  • for inflight starts, arms both igniters to provide ignition when engine start
    lever is moved to IDLE
  • releases to AUTO at start valve cutout.
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7
Q

Placing the engine start switch to GRND for inflight starts, arms both igniters to provide ignition when engine start lever is moved to IDLE. True or False?

A

True

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8
Q

Does the engine ignition automatically kick on when left in the AUTO mode, when it senses an engine flame out?

A

Yes

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9
Q

Does the engine ignition automatically kick on when left in the AUTO mode, and flaps are extended?

A

Yes. Below 18000 ft

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10
Q

Does the engine ignition automatically kick on when left in the AUTO mode, if you turn on the engine anti ice?

A

Yes

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11
Q

Engine start switch in FLT mode will turn on both engine ignitors if the fuel control switch is in idle. True or False?

A

True

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12
Q

EEC switch will display Both ON and ALTN if it has automatically switched to soft alternate mode. True or False?

A

True

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13
Q

What are the 3 modes for the EEC?

A

Normal, Soft Alternate and Hard Alternate

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14
Q

What type of engines are on the B737-800NG?

A

CFM56–7

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15
Q

What type of engines are on the B737 MAX?

A

LEAP-1B

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16
Q

Max thrust on the NG?

A

27k

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17
Q

Max thrust on the MAX?

A

28k

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18
Q

Does the EEC provide EGT protection?

A

No

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19
Q

Does the EEC provide N1 and N2 overspeed protection in both Normal and Alternate modes?

A

Yes

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20
Q

What is Thrust Control Malfunction Accommodation?

A

Thrust Control Malfunction Accommodation is an EEC function that provides
protection against idle thrust asymmetry conditions while on the ground (RTO or
landing roll). The TCMA function does not compare thrust between the engines, each
engine is monitored independently.
The EEC commands shutdown of the affected engine when the:
— airplane is on the ground, and
— thrust lever is at idle, and
— engine is above idle speed and not decelerating normally.
After TCMA activation, the amber ENG FAIL alert illuminates when N2 falls below
the ground N2 idle speed.

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21
Q

What is Electronic Overspeed System (EOS) ?

A

EOS is an EEC function that provides protection against the exceedance of engine
structural design limits. If an uncontrollable N2 overspeed condition is detected in
flight, the EEC automatically shuts off fuel to the affected engine. The amber ENG
FAIL alert illuminates when N2 falls below the schedule N2 idle speed determined by
flight condition. THRUST alert may or may not appear depending on flight condition,
power setting, and ENG FAIL timing.

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22
Q

When does the EEC goes into approach idle?

A

Approach idle is selected in flight if flaps are in landing configuration or engine anti–ice is ON for either engine.

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23
Q

When does the EEC start approach idle if it does not get valid signals from flaps or engine anti ice?

A

Approach idle is selected in flight if flaps are in landing configuration or engine anti–ice is ON for either engine.

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24
Q

Are the engines in approach idle until thrust reversers are stowed after landing?

A

Yes

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25
Q

How many engine driven fuel pumps are there?

A

2

26
Q

How many fuel/ oil heat exchangers are there?

A

2

27
Q

Is the fuel control unit a hydromechanical unit?

A

Yes

28
Q

Both spar fuel valve and engine fuel valves close if fuel control switch is selected to cutoff of engine fire switch is pulled. True or False?

A

True

29
Q

The NG has an HMU (Hydro mechanical unit) vs the MAX has an FMU (Fuel metering Unit) True or False?

A

True

30
Q

Starter cutout speed on the NG?

A

56% N2

31
Q

Starter cutout speed on the MAX?

A

Approximately 63% N2

32
Q

How long does bow motoring take?

A

6-90 seconds

33
Q

Do you get abnormal start protections for ground starts from the EEC?

A

Yes

34
Q

Do you get abnormal start protections for air starts from the EEC?

A

No

35
Q

What does the EEC do during a wet start event?

A

15 seconds after moving the start levers to idle, if there is no rise in EGT, the EEC shuts of fuel and ignition to the engine

36
Q

How many igniter plugs in each engine?

A

2

37
Q

What is the auto relight feature?

A

An auto-relight capability is provided for flameout protection. Whenever the EEC detects an engine flameout, both igniters are activated. A flameout is detected when an uncommanded rapid decrease in N2 occurs, or N2 is below idle RPM

38
Q

What is the power source for the left igniter plug in each engine?

A

Associated AC transfer bus

39
Q

What is the power source for the right igniter in each engine?

A

STANDBY AC BUS

40
Q

On the MAX aircraft, what happens if EGT approaches the start limit during inflight starts? Does the EEC give any protections?

A

Yes. During engine inflight starts if the EEC detects EGT to be within
10°C of the Start Limit Redline, the EEC momentarily interrupts fuel
flow and ignition to the engine for approximately 1 second. After the
interrupt, the EEC resumes fuel and ignition to continue the start attempt.
The EEC repeats this fuel flow interruption until a successful start is
achieved or the start attempt is aborted by the flight crew.

41
Q

Which hydraulic system powers the thrust reversers?

A

Left - System A

Right - System B

42
Q

If you loose system A hydraulic pressure, can the left thrust reverser operate?

A

Yes. The standby hydraulic system powers it. But it will be slow to operate.

43
Q

What does the reverser auto stow circuit accomplish?

A

auto–restow circuit compares the actual reverser sleeve position and the commanded reverser position. In the event of incomplete stowage or uncommanded movement of the reverser sleeves toward the deployed position, the auto–restow circuit opens the isolation valve and commands the control valve to the stow position directing hydraulic pressure to stow the reverser sleeves. Once the auto–restow circuit is activated, the isolation valve remains open and the control valve is held in the stowed position until the thrust reverser is commanded to deploy or until corrective maintenance action is taken.

44
Q

Are the thrust reversers operable in flight?

A

No. They are disabled as per Radar Altimeter and air ground logic. RA needs to indicate less than 10 or the a/c needs to be on the ground for the reverser to work.

45
Q

What does the REVERSER LIMITED light illuminated in flight mean?

A

The REVERSER LIMITED light, located on the aft overhead panel, illuminates in-
flight when a fault in the thrust reverser system limits reverser thrust. The thrust
reverser will not deploy or reverse thrust will be limited to idle if commanded

46
Q

What does the REVERSER LIMITED light illuminated on the ground mean?

A

REVERSER LIMITED light illuminates on the ground when a malfunction has
occurred.

47
Q

How many total positions does the reverser have?

A 
5
Stowed
Interlock
Detent 1
Detent 2
Max reverse
48
Q

On the MAX, what does the THRUST light on the engine display mean?

A

THRUST will illuminate if the actual thrust is more or less than the commanded thrust .

49
Q

REVERSER COMMAND light. What does it mean? Does it illuminate on the ground?

A

This simply warns crew that the reverser thrust lever is not down in-flight. (It is inhibited on the ground)

50
Q

REVERSER AIR/GRD light. What does it mean?

A

This illuminates when the air/ground thrust reverser logic has failed.

51
Q

REVERSER LIMITED light. What does it mean?

A

A fault has been detected which will limit reverse thrust on the indicated engine. If commanded reverse thrust will either not deploy or be limited to idle.

52
Q

ENGINE CONTROL light. What does it mean?

A

These lights remain unchanged from the NG and indicate a non-despatchable EEC fault.

53
Q

The temperature probe in the engine is used by what component?

A

EEC

54
Q

Is temperature probe data from the probe used during flight for thrust management etc?

A

No. It is used only on the ground and up to 5 mins after takeoff. After that, ADIRU is used for temperature data.

55
Q

Does the EEC provide EGT redline protection during a ground start?

A

Yes

56
Q

Does the EEC provide EGT redline protection during an air start?

A

No

57
Q

When will the EEC command approach idle if it fails to receive flap setting or anti ice signals in flight?

A

Passing 15000 ft

58
Q

What powers the right ignition system?

A

AC stby Bus

59
Q

For inflight engine starts, will the GRND position arm both igniters?

A

Yes. Only for inflight starts. For ground starts, it only arms the selected left or right igniter.

60
Q

If you happened to get a reverser unlocked in flight, the EEC will not command more than idle reverse thrust. True or False?

A

True. That is a protection feature.

B737 (22 decks)

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