SO1112 Fuel System Flashcards
Left engine is supplied by the left ____ fuel system.
forward
Right engine is supplied by the right ____ fuel system.
aft
How many fuel cells?
5 (rubberized nylon bladders)
Normal refueling method?
Single-point
How much less fuel from over-the-top?
40 LBS (3866 lbs vs 3906 lbs)
Why should the left (forward) system be filled first with over-the-top?
To prevent AC sitting on its tail due to imbalance
How many pounds of fuel in left system?
1916
How many pounds of fuel in right system?
1990
How many capacitance probes?
7
What are the inverted flight reservoir for?
Sustaining inverted or negative-G flight.
When will the RCP boost pump light turn on?
When the boost pump switches in the FCP are turned OFF
Does the boost pump lights in the RCP turn on in case of a boost pump failure?
No
What does the boost pumps do?
Provide fuel under pressure top the engine-driven fuel pump.
Will the engine run without the boost pumps?
Yes, they will run on gravity feed.
When is the crossfeeding system used?
With greater than 200 lbs imbalances (or emergencies)
You can use crossfeeding to transfer fuel from one system to another.
False. A check valve will prevent fuel being transferred from one system to another.
What does placing the throttles in OFF do?
Shut off the fuel at the main fuel control
A red indicator extended from the fuel drains indicates what?
That a fuel bypass has occurred.
Normal fuel pressure?
10 PSI
Low fuel pressure caution?
Less than 6 PSI
What is the most serious cause for a low fuel pressure caution?
A fuel leak - because of risk of flameout
When might the fuel pressure light come on in flt (no malfunction)?
After AB is selected
At high PWR settings while crossfeeding
Low fuel warning light?
Either quantity cage shows below 250 pounds
What is the delay for FUEL LOW and why?
7.5 sec. Prevents activating WCA in the event of slushing fuel.
When will a (white) fuel imbalance show on the EED? When will a red one occur?
Between 60-190 pounds.
Red: +200
What does a magenta line between fuel bars indicate?
Crossfeeding
Is fuel flow shown in AB?
No not the increased FF.
What power (AC/DC) does the fuel flow indicators run on?
DC. With out power they will show 0.
The engines flameout in case of both boost pumps failing.
False. They will gravity feed and keep running under normal conditions at reduced power settings.
Gravity flow is normally sufficient to maintain MAX power when?
Sea lvl - 25,000 ft (normally)
Sea lvl - 6000 ft (guaranteed)
Flameouts have occurred in MAX pwr while gravity feeding as low as ______ feet.
7000 (MSL)
You should not perform MAX thrust dives with less than ______ pound of fuel in EITHER system.
650
How much is the boost pump output reduced by when less than 650 pounds in the resevoir?
40%
MAX thrust flt at 0 or negative G should not exceed what?
10 sec at 10000 ft
30 sec at 30000 ft
What should you do in case of a fuel low light (nose position).
Raise the nose to keep air from entering the system
Taxi ops with less than _____ pounds could cause flameouts
150
You should keep fuel system within how many pounds of each other?
200
What is the max fuel difference allowed between fuel systems?
right (aft) equal more than twice the left (forward)
How to even out a fuel imbalance?
diff. PWR setting (preffered)
crossfeeding
At what fuel states are crossfeeding recommended (CBT)?
When imbalance exceeds 200 pounds
How to supply maximum amount of fuel to engine (when operating single-engine)?
Turn crossfeed on while both boost pumps are on
When not to crossfeed?
EED or Fuel quantity fail Boost pump inop Fuel leak Low alt/traffic pattern Low fuel state with eng running.
OFF indications shown on EED at fuel flow and quantity cages indicates what?
EED does not receive a sensor input
EED FAIL indicates what?
Internal EED failure (sensors still good)
Thunderstorms will cause the EED fuel quantity to vary as much as with _____ pounds
200
What will cause a FUEL PRESS light?
A fuel Surge Low fuel lvl at the boost pump A partial GEN fail (will likely have other indications too) Boost pump failure Fuel Leak
If FUEL PRESS light remains on after crossfeed is selected, what is then the cause?
Fuel Leak (or sensor malfunction)
If FUEL PRESS light remains on after crossfeed is selected, it is most likely a boost pump failure.
False. In case of boost pump failure the light should go out.
What is the worst low fuel press condition?
Fuel leak
What is the preferred action with a confirmed fuel leak?
Shut affected ENG and boost pump off to prevent fire/EXPLOSION!
When throttles are placed OFF, fuel to ENG is _______ shut off at the main fuel control, and also ________ at the fuel shutoff valve.
mechanically, electrically
What are the only two fuel items powered by the DC system?
crossfeed and fuel shutoff valves.
How can you check your fuel quantity with a total AC failure (EED out)
The static inverter
With an internal EED failure that affects the fuel gages, the normal white bar on the vertical scale is ________
blanked
