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T38C Systems > SY1113-4 Engine System > Flashcards

SY1113-4 Engine System Flashcards

1
Q

Engine Type

A

J85-GE- 5 Turbojet

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2
Q

How many stages and what type of flow is the engine

A

Eight Stage, Axial Flow

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3
Q

Thrust produced in MIL and MAX

A
  • 2200 lbs

- 3300 ilbs

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4
Q

avoid throttle movement from idle to max less than ___ secs

A

1 sec

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5
Q

Front Frame does

A

Directs Flow of Air at Optimum Angle Using the Inlet Guide Vanes

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6
Q

Compressor does

A

Supplies Large Masses of Compressed Air to the Combustion Section

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7
Q

8 th Stage Compressor Air Operates the Following Engine and Aircraft Pneumatic Systems

A

-Inlet guide vanes
-Bleed Air valves
-Defog
-Canopy seal
-A/C
-Pressurization
Hydraulic reservoir px
-engine anti-ice

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8
Q

Combustion Section use how much of the air for combustion

A

25%

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9
Q

Afterburner accelerates exhaust by how mcuh

A

5-40%

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10
Q

What is mounted to engine gearbox (TOMAN)

A
  • T5 alternator
  • Oil Pump
  • Main Fuel Control (MCF)
  • Afterburner Fuel control
  • Nozzle Actuator
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11
Q

Oil Pump

A
  • 4 quarts (expansion space of 1 qt)
  • 1 pint per hour max oil consumption
  • House T5 Alt and Tach generator
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12
Q

Main Fuel Control (MFC)

A
  • Hydro mechanical
  • Prevent Flameouts/ Compressor stall/ overtemp by controlling fuel
  • Variable geometry system ( Inlet guide vanes, Air bleed valves
  • Reduce fuel at low power settings
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13
Q

MFC controls fuel given by

A
  • discharge px
  • inlet temp
  • RPM
  • Throttle Position
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14
Q

Afterburner sequence

A
  • Throttles Max
  • Fuel thru Pilot spraybars
  • T5 sences increase in temp and takes over and over 97%
  • Main spraybars activate
  • AB TIME
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15
Q

T5 controls AB by

A
  • Discharge Pressure
  • Throttle Position (over 97%)
  • Nozzle Actuator (overrides)
  • Temperature
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16
Q

Overspeed Governor after MFC

A

Monitors the Maximum Speed of the Engine and Reduces Fuel Flow as Needed

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17
Q

T2 Sensor

A

Limits Fuel Flow as a Function of Inlet Temperature

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18
Q

Variable Area Exhaust Nozzle controls EGT via

A
  • Hydromechanical System and the T5 System
  • IDLE to 97% Controls the Nozzles to Maintain EGT, Maxing to Full Closed at 97%
  • When Retarded From MAX Through 97%, Closes Nozzles
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19
Q

T5 system controls when

A

-Beyond 97% RPM Opens the Nozzles to Ensure EGT Limitations

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20
Q

Anti-Ice is located where

A

Bullet Nose and Inlet guide vanes

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21
Q

Anti-Ice comes from where and EGT raise/ power change

A
  • from 8th stage compressor
  • Between 94% - 98% RPM, Increase in EGT of 15C Can be Expected
  • Requires 80% RPM (Automatically Turns on at 65%)
  • 9% Loss of Thrust at MIL and a 6.5% Loss of Thrust in MAX
22
Q

When to use Anit-Ice

A

Should be Used Below 32F and in Visible Moisture or High Humidity

23
Q

What are the 7 parts of the engine, in order (FCMCTEAN)

A

Front frame, compressor, main frame, combustor, turbine, exhaust, afterburner, nozles

24
Q

What is the function of the front frame section?

A

Admit air into compressor section and direct airflow into the first stage compressor at proper angle

25
Q

What is the function of the compressor section?

A

Supply large masses of compressed air into the combustion section.

26
Q

What is the function of the main frame section?

A

Primary structural component and divergent diffuser passage for compressed air entering combustion section

27
Q

What is the function of the combustion section?

A

To add fuel to the compressed air and ignite it

28
Q

What is the function of the turbine section?

A

Extract energy from the high-velocity airstream to drive compressor and engine accessories

29
Q

What is the function of the exhaust section?

A

Smooths out airflow leaving turbine and entering tailpipe, contains AB fuel and lighting components and T5 sensor

30
Q

What is the function of the afterburner section?

A

augment thrust of main engine 5-40% at a cost of of twice the fuel consumption per pound of thrust

31
Q

What is the function of the variable area exhaust nozzle?

A

Provides an efficient exit passage that opens and closes to optimize engine efficiency and control EGT

32
Q

What is the purpose of the variable geometry system?

A

Inlet guide vanes direct incoming air to the optimum AOA

33
Q

What are the operating characteristics of the variable geometry system?

A

At low RPM, bleed valve opens to allow compressed air escape the 3rd-5th stages of the compressor

34
Q

What is the purpose of the engine anti-ice system?

A

To prevent ice build-up on the inlet vanes and bullet nose of the engine

35
Q

What are the operating characteristics of the engine anti-ice system?

A

Directs 8th stage compressor air; automatically comes on with right AC failure

36
Q

What is the purpose of the engine accessories?

A

Converts engine power into usable power for aircraft systems

37
Q

What are the operating characteristics of the engine accessories?

A

Divided into 2 sections - airframe accessories and airframe mounted gearbox. Driven by a power takeoff (PTO) from engine compressor drive shaft

38
Q

What is the purpose of the fire detection system?

A

Warn the pilot of a high-temperature condition in the engine bay

39
Q

What are the operating characteristics of the fire detection system?

A

Cannot be dimmed, independent for L and R, operates on DC power, sensors are pneumatically operated through inert gas, can respond to average or highly localized temps

40
Q

What is unique about the tachometer?

A

Only independently operated indicator in the whole jet

41
Q

What are the three failure modes of the tachometer?

A

broken wire (0%), sheared oil pump shaft, EED failure (FAIL)

42
Q

What are the AC-powered instruments?

A

hydraulic pressure, engine tachometer, fuel flow, fuel quantity, oxygen quantity, oil px

43
Q

What are the engine-oil restrictions for zero-g and neg-g flight?

A

10 seconds and 30 seconds

44
Q

What are the DC-powered instruments (NEEF)?

A

nozzle, EED, EGT, flaps

45
Q

What purpose fo the inlet fuide vanes serve?

A

Reduce possibility of compressor stalls

46
Q

How will anti-ice be affected with an AC power failure?

A

fully effective (automatic) above 80% RPM

47
Q

What atmospheric conditions should you use anti-ice?

A

Temp near or below 32*, visible moisture or high humidity

48
Q

What is the primary advantage of afterburners in engine design?

A

High thrust for low weight

49
Q

Name 3 properties of the T5 system and nozzles

A

Nozzles close until 97%, T5 operates nozzles to maintain 630-650 EGT in MAX, and T5 system’s purpose maintain EGT within limits

50
Q

What are two ways you can observe the T5 system working?

A

Observe EGT between 630 and 650 and check nozzles open while advancing throttle from 97% to MIL

51
Q

What is the T5 electrical source?

A

Independent AC alternator

T38C Systems (15 decks)

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