Fuel System Flashcards
What does turning the DC Fuel Pump knob to AUTO do?
Automatically commands the pump ON when:
- ENG 2 or APU is started, and;
- AC Fuel Pump 2 is not available
Can the aircraft be refueled when there is no electrical power?
Yes, the pressure refuel/defuel panel is linked to HOT BATT BUS 2.
Describe the collector tank.
Where the AC, DC, and Ejector pumps are located. This tank keeps these fuel pumps submerged.
Describe the main tank.
Main storage area for fuel.
Describe the purpose and use of the AC fuel pump (3 uses).
- Used to supply fuel during engine start.
- Serves as a backup to the main ejector pump.
- Supplies fuel to both engines from a single fuel tank during crossfeed
Describe the surge tank.
Collects any fuel that may enter the vent during wing down and uncoordinated maneuvers.
Describe the uses of the DC Fuel Pump (3 uses).
- Primarily used to supply fuel to the APU during start without AC power.
- Can supply fuel to ENG 2 during a start without AC power.
- Operative during an electrical emergency and can be used to start the APU or ENG 2.
Describe what the Ejector Pump is and how it flows.
It is the primary pump used to transport fuel from the collector tank to the engine.
It has no moving parts. It relies on motive flow from the engine driven fuel pump.
What is each integral tank divided into?
The surge, main, and collector tank.
How do you manually close the engine fuel shutoff valve?
By pulling the engine fire handle.
How many fuel shutoff valves are there?
Three.
- APU
- Engine
- Crossfeed
How many scavenge pumps are there and what is their purpose?
Three scavenge pumps in each main tank to maintain the level in the collector tank.
If you refuel with the engines running, can passengers be onboard?
No, only the crew may be onboard.
What does selected XFEED LOW 1 do?
Opens the crossfeed valve and automatically activates the right AC fuel pump (AC PUMP 2), supplying fuel to both engines from the right wing tank.
What does selecting XFEED LOW 2 do?
Opens the crossfeed valve and automatically activates the left AC fuel pump (AC PUMP 1), supplying fuel to both engines from the left wing tank.
What is the maximum fuel capacity?
20,935 lbs
What is the minimum fuel temperature limitation?
-37C
What is the Skywest fuel balance limitation?
794 lbs
What two things must be met if the aircraft is refueled with passengers on board?
- The flight crew must maintain contact with refueling personnel
- Engines must be off
When AC pump 1 is AUTO, what is the logic? (3 things)
It turns the pump ON when:
- ENG 1 is starting, or
- XFEED selected LOW 2, or
- Main ejector pump fails
When AC pump 2 is AUTO, what is the logic? (4 things)
Turns the pump ON when:
- ENG 2 is starting, or
- APU is starting or running without ENG 2 running, or
- XFEED selected LOW 1, or
- Main ejector pump 2 fails
When do you declare “Emergency Fuel”?
When showing you will land with 30 minutes or less of fuel (1500 lbs).
When do you declare “Minimum Fuel”?
When showing you will land with less than 45 minutes of fuel (2250 lbs).
When do you need to check fuel after takeoff?
At the TOC and at least once every hour thereafer. Compare fuel onboard to the flight release and/or “how goes it” page from ACARS.
