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T38C Systems > SY1112 Fuel System > Flashcards

SY1112 Fuel System Flashcards

1
Q

Do the engines share the fuel system

A

No. independent for each side

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2
Q

Left Engine Fuel Cells

A

Forward Fuselage and Dorsal Cells

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3
Q

Right Engine Fuel Cells

A

Center and Aft Fuselage Cells

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4
Q

Total Fuel and per respective side

A
  • 3906 lbs total w/ single point
  • Left = 1916 lbs
  • Right = 1990 lbs
  • Manual fueling is 60 lbs less
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5
Q

Which tank must be filled 1st

A

Left Engine tanks

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6
Q

Fuel Boost Pumps

A

AC Powered, Supplies Fuel Under Low Pressure to the Engine-Driven Fuel Pump

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7
Q

Max Altitude with gravity feed

A
  • 25000’

- Guaranteed only to 6000’, flameouts @ 7,000’ have occurred

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8
Q

Are Engine-Driven Boost Pumps Necessary for Engine Operation

A

Yes

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9
Q

Normal Fuel Px, when does WCA light illuminate

A
  • 10 Psi norm

- 6 Psi light on

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10
Q

Left Boost Pump is in the

A

Forward Fuselage Cell

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11
Q

Right Boost Pump is in the

A

Aft Fuselage Cell

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12
Q

Two Fuel Low Pressure Lights in Both Cockpits with Crossfeed off or ON

A
  • Crossfeed Off – Indicates Boost Pump Failure

- Crossfeed On – Indicates Possible Fuel Leak

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13
Q

Is Blinking low fuel Px during AB an indication of boost failure?

A

-No during AB

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14
Q

Fuel Shutoff Switches are ___ Powered, normally operated by. how long does it take to shutoff fuel w/ switch?

A
  • DC powered on Left Essential
  • Normally controlled via throttle
  • 1 sec to shutoff fuel, can cause damage to engine driven fuel pump and MFC
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15
Q

Fuel Crossfeed is powered by?

Does what when switched on?

A
  • DC power

- Electrically opens/closes valve in crossfeed manifold

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16
Q

When to use crossfeed function?

A

W/ fuel imbalance over 200 lbs, less than that use differential throttles

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17
Q

When you turn on crossfeed, what else should you do?

A

-Crossfeed on, light tank boost pump OFF!

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18
Q

Don’t Crossfeed when?

A
  • Boost Pump fail
  • Fuel indicator failure
  • Leak
  • Low Alt w/ 2 engines
  • Low fuel w/ 2 engine
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19
Q

Does fuel flow read during AB?

A

NOPE burn those dinos

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20
Q

Fuel quantity powered by?

A

AC powered

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21
Q

Fuel imbalance

A
  • 10 lbs increments under heavy tank
  • white # : 60-200lbs
  • Red # : 200lbs or more
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22
Q

Fuel Low light comes on at?

A

250 lbs and below with 7.5 sec delay

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23
Q

Can you check fuel quantity with AC failure? How?

A

Yes, by Engaging Static Inverter

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24
Q

Fuel imbalance will solo should never exceed

A

Ensure Right Does Not Equal Twice the Left System, CG out of limits

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25
Q

At what weight in fuel does fuel output go down?

A

-below 650 lbs output is reduced 40%

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26
Q

Situation to use Crossfeed and leave boost pumps on?

A

Single engine/ low fuel

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27
Q

Avoid max thrust dives with _____lbs or less

A

650 lbs

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28
Q

Fuel Imbalance Must be Maintained Within for CG

A

200 lbs

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29
Q

Prevention of Fuel Starvation

A

Avoid MAX Thrust in 0 or – G Flight Exceeding

  • 10 sec - sea lvl to 10k’
  • 30 sec - 10k’ to 30k’
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30
Q

With FUEL PRESS light on, crossfeed OFF, fuel shutoff in norm and throttle is out of off, is it boost pump fail or leak?

A

boost pump fail

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31
Q

With FUEL PRESS light on, crossfeed ON, fuel shutoff in norm and throttle out of off, is it boost pump or leak

A

leak

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32
Q

Easy way to differentiate between boost pump fail and fuel leak with FUEL PRESS light?

A

crossfeed OFF is boost pump fail, crossfeed ON is fuel leak

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33
Q

When is a normal momentary illumination of the FUEL PRESS light

A

AB ignition

34
Q

How much of an imbalance before using crossfeed

A

200lbs

35
Q

Can you transfer fuel from one tank system to another using crossfeed

A

no

36
Q

If operating single engine, how do you use all the available fuel in both sides

A

crossfeed

37
Q

What is the rule for turning switches ON/OFF when using crossfeed

A

Turn one ON to turn on OFF

38
Q

When crossfeeding with only one engine (using fuel from both sides), the engine is fuel by which tank group

A

the one with the stronger boost pump

39
Q

When less than 250 lbs in either system managing balance is less important than what

A

preventing a flameout

40
Q

When less than 250 lbs in either system, what should be done to prevent flameout.

A

Both boost pumps on, crossfeed on

41
Q

With both boost pumps on, crossfeed on and one tank empties, what happens

A

the other tank takes full over fuel feeding

42
Q

The RCP boostpump and crossfeed lights indicate what

A

switch position and not actual operation

43
Q

What 5 times do you not cross feed

A 
"Boost pump fail
Fuel leak
Fuel quantity malfunction
Two engines and low altitude
Two engines and low fuel"
44
Q

When should you use split throttles to balance fuel

A

traffic pattern, low-altitude

45
Q

How is the engine fuel if the boost pump is inop

A

gravity feed

46
Q

With one to two engines and one to two fuel systems (left/right) when will gravity feed provide sufficient fuel

A

gravity feed should be sufficient for 2 engine and 2 fuel systems, 1 engine and 2 fuel systems, but may NOT be sufficient for 2 engines and 1 system

47
Q

Main fuel pumps supply fuel under _________ pressure

A

high

48
Q

Main fuel control is a _______________ unit

A

hydromechanical

49
Q

Main fuel control has two major systems, the _____________ and ________________ system

A

computer, metering

50
Q

Main fuel control computer section…

A

senses engine inlet temp, compressor discharge pressure, engine speed and throttle position

51
Q

Fuel metering section…

A

delivers computed fuel flow to the engine

52
Q

Auxiliary function of the main fuel control is…

A

schedule the Variable Geometry System (VGS)

53
Q

The overspeed governor (OSG)…

A

mechanically monitors the maximum speed of the engine

54
Q

Fuel flow transmitter…

A

measures main engine fuel flow only, not AB

55
Q

Afterburner fuel pump is mounted…

A

on the engine accessory section

56
Q

Afterburner fuel control has three major sections…

A
  1. computer section 2. fuel metering section 3. nozzle control
57
Q

AB computer section senses…

A

compressor discharge pressure and throttle setting

58
Q

AB fuel metering section…

A

supplies correct fuel flow to pilot burner and main AB spraybar manifolds

59
Q

T5 system (turbine discharge temp) engages at ___

A

97%

60
Q

AB nozzle control section…

A

schedules the exhaust nozzle opening when directed by the T5 system

61
Q

of sets of spraybars in the AB section

A

2

62
Q

___________ bus is used for a ground start

A

Battery

63
Q

_________ engine should be started first

A

Right

64
Q

Static inverter converts __ power to __ for the ______ engine instruments

A

DC, AC, right AC

65
Q

Battery switch should be ___ before connecting the APU

A

On

66
Q

After checking everything’s clear, the first step to starting the engine

A

Signal crew chief to connect the air supply

67
Q

Second step

A

Signal starting #2

68
Q

Start right engine at __% RPM minimum

A

12

69
Q

Third step

A

Signal crew chief to divert air to left engine

70
Q

Fourth step

A

Signal starting #1 and start same as right

71
Q

With one engine operating you can attempt _______________ airstarts

A

unlimited

72
Q

With a dual engine flameout, attempt to start the ___________ engine first

A

right

73
Q

Leave the throttle at IDLE for __ seconds before aborting a start

A

30

74
Q

Airstart envelope

A
75
Q

Compressor stall is a…

A

disruption of smooth airflow over the compressor blades

76
Q

Low altitude, high airspeed compressor stall indications

A

loud noise, rapid RPM decrease, rapid EGT increase

77
Q

High altitude, low airspeed compressor stall indications

A

rapid RPM decrease, rapid EGT decrease

78
Q

Sheared oil pump shaft fail indications

A

oil pressure and RPM decrease to Zero, T5 system fails

79
Q

Correct course of action for Sheared oil pump shaft

A

Shut down the affected engine

80
Q

T5 system failure indications

A

AB will probably not ignite, high EGT, closed nozzle at or above ~97% RPM

T38C Systems (15 decks)

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