T-1 Fuel System

Front 1

Fuel system ops limits
Alt:
Temp:

Back 1

Sea Level to 41,000ft
-40c to 50c

Front 2

Fuel flows from the left/right engine feed tank ___

Back 2

to the left/right engine

Front 3

Aft/Fwd transfer jet pumps
Location:
Purpose:

Back 3

Location: Each engine feed tank
Purpose: transfer fuel from wing tanks to the engine feed tank

Front 4

Motive flow for the aft transfer jet pump is normally supplied ___

Back 4

by the primary jet pump

Front 5

Motive flow for the forward transfer jet pump is supplied automatically on demand ___

Back 5

by the boost pump when the fuel level in the engine feed tank drops below the full level

Front 6

During normal operation, fuel feed to each engine is ___

Back 6

provided by the primary jet pump

Front 7

Motive flow for the primary jet pump is ___

Back 7

supplied by the engine-driven fuel pump through the motive flow valve

Front 8

The boost pump is used during ___

Back 8

engine starting, fuel crossfeed, wing tank to feed tank fuel transfer, and as a backup for the primary jet pump

Front 9

A fuel shutoff valve in each fuel feed line stops fuel flow to the ___

Back 9

engine in case of engine fire or fuel leakage downstream of the valve

Front 10

Each fuel filter contains a ___ and ___

Back 10

Pressure switch
a bypass valve

Front 11

L/R F FLTR BYPASS

Back 11

Filter pressure switch differential exceeds 2.3psi (fuel filter bypass is open)

Front 12

Fuel distribution subsystem is powered through the respective

Back 12

(Left/Right) Load Bus

Front 13

Do not reset a popped circuit breaker ___

Back 13

in the fuel system

Front 14

Fuel storage subsystem:
Tank storage and supply system

Back 14

4 fuel tank in the fuselage and one in each wing
3 vent surge tanks, one in the fuselage and one in each wing
Gravity flow plumbing and pressure fuel lines
11 sump drains serve the tanks and fuel lines
Gravity and pressure refueling ports and defueling drains

Front 15

Fuel storage subsystem:
Fuel tanks

Back 15

Aft cabin
Aft fuselage
Two mid tanks
Wing: 3 bays, fuel feed chamber (inner bays)

Front 16

The ___ tank is the first to reach empty

Back 16

aft cabin

Front 17

Wing tanks:
Type/Location
Capacity pres/gravity

Back 17

Outboard Wing (wing tip)
Center Wing
Inboard Wing
Fuel feed chamber (inboard wing)

Pressure: 204.5gal
Gravity 211.5gal

Fuel Feed Chamber approx 20gal

Front 18

Fuel system capacity lbs - gal(6.7lbs/gal):
Pressure
Gravity

Back 18

Pressure 5166lbs 771gal
Gravity 4951lbs 739gal

Front 19

The fuel system uses four electric pumps:

Back 19

two boost pumps and two transfer pumps

Front 20

Boost pumps:
Location
Purpose

Back 20

Located in each fuel feed chamber
Serve four purposes: engine starting, backup for the primary jet pumps, fuel pressure for the two transfer jet pumps (in each fuel feed chamber), crossfeed

Front 21

In the automatic mode, the boost pump will operate when:

Back 21

fuel feed line pressure drops below 5psi
fuel feed chamber volume falls below full
engine starting is selected
crossfeed is selected

Front 22

Once automatic boost pump operation is initiated by the low pressure or low fuel volume condition, ___

Back 22

it pumps continuously until manually turned off

Front 23

Two transfer pumps are used to transfer fuel from ___

Back 23

the mid fuselage tanks into the wing tanks.

Front 24

What causes the transfer pump to actuate/shutoff?

Back 24

electrical signals from a float valve located within the mid tank and a fuel pressure sensor located in the transfer line (5.0+-0.5 psi)

Front 25

Do not operate transfer pumps ___

Back 25

dry. Pump damage will occur.

Front 26

R or L XFER PRESS LO

Back 26

Fuel pressure in transfer line below 5.0+-0.5psi (Fuel trans switch in ON)

Front 27

There are both primary and transfer jet pumps located ___

Back 27

in each fuel feed chamber

Front 28

In what orders do fuel tanks fill up?

Back 28

Refueling manifold check valve to aft fuselage to aft cabin, mid tanks, wing tanks.

Front 29

At what times does the boost pumps come on automatically?

Back 29

Engine start, cross feed, fuel feed chamber less than full, less than 5+-.5 psi in the fuel feed line. EFFC (Engine Start,Fuel feed line<5psi+-.5,Feed Chamber Less than full, Crossfeeding)

Front 30

What is motive flow?

Back 30

An induced high velocity low mass fluid stream.

Front 31

How do pilot level control valves work?

Back 31

much like a toilet float shuts off incoming water after a certain level is reached

Front 32

How does the fuelcross feed work?

Back 32

When the appropriate side is selected, fuel is fed from that wing to both engines.

Front 33

What are the limitations for cross feeding?

Back 33

Limited to level flight when less than 600# remains in the wing tank supplying fuel

Front 34

Can you transfer fuel from one tank to another?

Back 34

No engines running, Yes engines not running

Front 35

What has happened if both boost pumps illuminate (during cross feed)?

Back 35

The selected side’s boost pump is not providing enough pressure

Front 36

The L or R FUEL LEVEL LO annunciator illuminates when wing fuel tank level drops below ___ gallons or approximately_____ of usable fuel remaining.

Back 36

32 gal/200 lbs

Front 37

The L or R FUEL FEED annunciator illuminates when low fuel quantity is sensed in the fuel feed chamber (approximately __gallons or __ lbs of usable fuel remaining).

Back 37

11 gal/70lbs

Front 38

The L or R WNG TNK OV PRESS annunciator illuminates when wing tank pressure reaches _____ psi. This indicates a possible malfunction in the control pilot or level control shutoff valve. If malfunction occurs in a climb, level off and pull back power.

Back 38

3.5 +- 0.5 psi.

Front 39

The L or R FUEL PRESS LO annunciator illuminates when fuel pressure drops to ____psi in each engine fuel feed line.

Back 39

5.0 +- 0.5

Front 40

The L or R F XFR PRESS LO annunciator illuminates when fuel pressure in the transfer line falls below____ psi. This may indicate possible fuel transfer pump malfunction/failure.

Back 40

5.0 +- 0.5

Front 41

The L or R F FLTR BYPASS annunciator illuminates when the fuel filter becomes clogged causing line pressure to exceed____ psi. The bypass valve will open routing unfiltered fuel to the engine

Back 41

2.3 +- 0.2

Front 42

What does a jet pump light mean?

Back 42

Indicates that the motive flow valve is opening or closing

Front 43

L FUEL LVL LO

Back 43

<200 lbs/32 gal

Front 44

XFR PX LO

Back 44

<5 +- 0.5psi

Front 45

L WG TK OV PX

Back 45

3.5 +- 0.5psi

Front 46

L FUEL FEED

Back 46

<70 lbs/11 gal

Front 47

L FUEL PX LO

Back 47

5 +- 0.5psi

Front 48

Single Point Refuel Takes

Back 48

15min

Front 49

Px Refuel

Back 49

5166 lbs/771 gal

Front 50

Gravity Refuel

Back 50

4951 lbs/739 gal

Front 51

Boost Pump Auto On:

Back 51

Engine start
Fuel Px Lo
Fuel Feed Lo
Crossfeed