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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
At what weight in fuel does fuel output go down?
-below 650 lbs output is reduced 40%
26
Situation to use Crossfeed and leave boost pumps on?
Single engine/ low fuel
27
Avoid max thrust dives with _____lbs or less
650 lbs
28
Fuel Imbalance Must be Maintained Within for CG
200 lbs
29
Prevention of Fuel Starvation
Avoid MAX Thrust in 0 or – G Flight Exceeding - 10 sec - sea lvl to 10k' - 30 sec - 10k' to 30k'
30
With FUEL PRESS light on, crossfeed OFF, fuel shutoff in norm and throttle is out of off, is it boost pump fail or leak?
boost pump fail
31
With FUEL PRESS light on, crossfeed ON, fuel shutoff in norm and throttle out of off, is it boost pump or leak
leak
32
Easy way to differentiate between boost pump fail and fuel leak with FUEL PRESS light?
crossfeed OFF is boost pump fail, crossfeed ON is fuel leak
33
When is a normal momentary illumination of the FUEL PRESS light
AB ignition
34
How much of an imbalance before using crossfeed
200lbs
35
Can you transfer fuel from one tank system to another using crossfeed
no
36
If operating single engine, how do you use all the available fuel in both sides
crossfeed
37
What is the rule for turning switches ON/OFF when using crossfeed
Turn one ON to turn on OFF
38
When crossfeeding with only one engine (using fuel from both sides), the engine is fuel by which tank group
the one with the stronger boost pump
39
When less than 250 lbs in either system managing balance is less important than what
preventing a flameout
40
When less than 250 lbs in either system, what should be done to prevent flameout.
Both boost pumps on, crossfeed on
41
With both boost pumps on, crossfeed on and one tank empties, what happens
the other tank takes full over fuel feeding
42
The RCP boostpump and crossfeed lights indicate what
switch position and not actual operation
43
What 5 times do you not cross feed
``` "Boost pump fail Fuel leak Fuel quantity malfunction Two engines and low altitude Two engines and low fuel" ```
44
When should you use split throttles to balance fuel
traffic pattern, low-altitude
45
How is the engine fuel if the boost pump is inop
gravity feed
46
With one to two engines and one to two fuel systems (left/right) when will gravity feed provide sufficient fuel
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
Main fuel pumps supply fuel under _________ pressure
high
48
Main fuel control is a _______________ unit
hydromechanical
49
Main fuel control has two major systems, the _____________ and ________________ system
computer, metering
50
Main fuel control computer section…
senses engine inlet temp, compressor discharge pressure, engine speed and throttle position
51
Fuel metering section…
delivers computed fuel flow to the engine
52
Auxiliary function of the main fuel control is…
schedule the Variable Geometry System (VGS)
53
The overspeed governor (OSG)…
mechanically monitors the maximum speed of the engine
54
Fuel flow transmitter…
measures main engine fuel flow only, not AB
55
Afterburner fuel pump is mounted…
on the engine accessory section
56
Afterburner fuel control has three major sections…
1. computer section 2. fuel metering section 3. nozzle control
57
AB computer section senses…
compressor discharge pressure and throttle setting
58
AB fuel metering section…
supplies correct fuel flow to pilot burner and main AB spraybar manifolds
59
T5 system (turbine discharge temp) engages at ___
97%
60
AB nozzle control section…
schedules the exhaust nozzle opening when directed by the T5 system
61
of sets of spraybars in the AB section
2
62
___________ bus is used for a ground start
Battery
63
_________ engine should be started first
Right
64
Static inverter converts __ power to __ for the ______ engine instruments
DC, AC, right AC
65
Battery switch should be ___ before connecting the APU
On
66
After checking everything's clear, the first step to starting the engine
Signal crew chief to connect the air supply
67
Second step
Signal starting #2
68
Start right engine at __% RPM minimum
12
69
Third step
Signal crew chief to divert air to left engine
70
Fourth step
Signal starting #1 and start same as right
71
With one engine operating you can attempt _______________ airstarts
unlimited
72
With a dual engine flameout, attempt to start the ___________ engine first
right
73
Leave the throttle at IDLE for __ seconds before aborting a start
30
74
Airstart envelope
75
Compressor stall is a…
disruption of smooth airflow over the compressor blades
76
Low altitude, high airspeed compressor stall indications
loud noise, rapid RPM decrease, rapid EGT increase
77
High altitude, low airspeed compressor stall indications
rapid RPM decrease, rapid EGT decrease
78
Sheared oil pump shaft fail indications
oil pressure and RPM decrease to Zero, T5 system fails
79
Correct course of action for Sheared oil pump shaft
Shut down the affected engine
80
T5 system failure indications
AB will probably not ignite, high EGT, closed nozzle at or above ~97% RPM

T38C Systems (15 decks)

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