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McDonnell Douglas DC-9/MD-80 (none) > Engines > Flashcards

Engines Flashcards

1
Q

What percentage value passes through the core of the engine?

A

52%, the other 48% is around the engine.

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2
Q

What is the purpose of the Anti-Surge Bleed System is it automatic?

A

It is automatic.
Prevent compressor stall during initial acceleration
Air in acceleration of the engine rotor during start.

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3
Q

Which compressor is the low compressor and how many stages does it have?

A

N1 and it comprises the first 6 compressor stages.

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4
Q

Which compressor is the high compressor stage and how many stages does it have?

A

N2 and it comprises the last 7 compressor stages.

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5
Q

What is the Starter Duty Cycle?

A

90 seconds ON, 5 min OFF, 30 seconds ON, 5 min off. (May continue indefinetely).

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6
Q

What is the Ignition Duty Cycle?

A

10 minutes ON, 10 minutes OFF.

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7
Q

Losing N2 RPM sense input to the Fuel Control will cause what engine reaction?

A

The engine will default to takeoff RPM.

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8
Q

Losing Ps4 input to the Fuel Control will cause what engine reaction?

A

The engine will default to idle RPM.

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9
Q

What can be done to help cool hot engine oil, if still within limits?

A

Increase thrust. This will move colder fuel at a fast rate through the fuel oil cooler.

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10
Q

The start valve solenoid is powered by what bus?

A

The DC Transfer Bus through the ENGINE START switch.

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11
Q

Which engine instruments do not require electrical power?

A

N1
N2
EGT

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12
Q

Which engine compressor section drives the accessory gearbox and how is this achieved?

A

N2, and this is done through a tower shaft.

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13
Q

What accesories are mounted on the gearbox?

A 
Pneumatic Starter
Engine driven fuel pump
Fuel control unit
Hydraulic pump
Tachometer generator
Oil pump
Constant Speed Drive (CSD)
AC Generator
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14
Q

What is the recommended psi for a start and can an attempt with a lower value be made?

A

36 psi and yes you may attempt with a lower value.

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15
Q

How many gallons of oil are in the engine oil tank and how many are usable.

A

5 total 4 of which are usable.

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16
Q

Can an oil strainer be bypassed?

A

Yes. But you would see an oil strainer clogging light go on.

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17
Q

How is oil cooled?

A

With airflow and by fuel absorbing heat in the fuel oil cooler unit.

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18
Q

What psi does the low pressure engine driven fuel pump pressurize fuel to?

A

90 psi

19
Q

What psi does the high pressure engine driven fuel pump pressurize fuel to?

A

900 psi

20
Q

What is the path that fuel takes from the wings to the engines?

A 
Low pressure fuel pump (90 psi)
Fuel heater
Fuel filter
High pressure pump (900 psi)
Fuel control unit
Fuel oil cooler
Combustion chamber
21
Q

Can the high pressure pump suction feed?

A

No, only the low pressure pump can.

22
Q

If the low pressure pump fails what engine operation is affected?

A

Fuel heating will not be operable.

23
Q

Can the engine run with the high pressure fuel pump broken?

A

No the engine will flameout due to fuel starvation.

24
Q

Where does the fuel filter get its air from?

A

The 13th stage bleed air. (Off its own manifold).

25
Q

Where does the Fuel Control Unit get its indications from?

A

N2
Inlet temperature (Tt2)
Combustion chamber pressure (Ps4)
Thrust lever settings

26
Q

Hos is the Fuel Control Unit driven?

A

By N2 off the engine accessory drive.

27
Q

What will happen if N2 sense is lost?

A

The engine will automatically drive to 95%. Throttle control will be lost.

28
Q

If the combustion chamber air pressure line ruptures what will happen to the engine?

A

It will be driven to idle RPM. Throttle control will be lost.

29
Q

What is the capacitance of the engine ignition system?

A

20 Joules

30
Q

When will the ignitors function?

A

When selected to either A or B and the fuel control levers ON.

31
Q

Are thrust reversers considered to be part of the landing criteria?

A

No

32
Q

What powers the RAT/EPR probe?

A

Right AC Bus

33
Q

Is that RAT/EPR probe heated?

A

Yes inflight only sensed groundshift.

34
Q

What does Automatic Reserve Thrust do and what does it look for? (MD80)

A

Compares engine N1 rotation against one another looking for a difference of 30%. Will increase thrust on the good engine by 700 lbs.

35
Q

What are the three things that will cause ART to fire?

A

30% difference in engine N1
Windshear
Switching flight guidance systems

36
Q

What is the max thrust of JT8D-219 engines? (MD80)

A

21,000 lbs.

37
Q

What is the max start EGT for JT8D-219 engines? (MD80)

A

475 on the ground and 625 inflight.

38
Q

What is max continuous EGT for JT8D-219 engines? (MD80)

A

580

39
Q

What is max takeoff EGT for JT8D-219 engines? Is there a limit associated with this?

A

630 Reserve, 595 max. Has a limitation of 5 minutes.

40
Q

When does ART arm?

A

When both engines are above 64%

41
Q

What does Automatic Thrust Restoration do and when is it activated?

A

It will move both throttles up until one engine reaches its EPR limit. It is activated by vertical speed < 0 for 5 seconds or there is a .25 and 7% N1 drop on the same engine.

43
Q

When is Automatic Thrust Restoration armed?

A

Takeoff pitch selected in the flight directors
Altitude is > 350 ft.
Power is less than that for GA in both engines

44
Q

When does ART know when to engage?

A

By comparing N1 rotation and looking for differences that are greater than 30%.

45
Q

When does ART disarm?

A

When the slats are retracted,

McDonnell Douglas DC-9/MD-80 (none) (15 decks)

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