Rajan Wilcox
The CRJ, or Canadair Regional Jet, is a regional airliner designed and manufactured by Bombardier Aerospace. The CRJ series includes the CRJ-100, CRJ-200, and CRJ-900 variants, each with different fuel tank configurations. The CRJ-200, for example, has a total fuel capacity of 6489 kg, with the left and right wings each capable of holding approximately 2159 kg of fuel, and the center tank able to hold around 2267 kg. In some cases, CRJs have been modified with additional ferry tanks installed in the passenger cabin to extend their range, requiring a mechanic to transfer fuel from these tanks to the main tanks during flight. The CRJ fuel system includes collector tanks, ejector pumps, and boost pumps that work together to ensure a steady fuel supply to the engines, although anomalies in fuel feed behaviour have occasionally been reported.
| Characteristics | Values |
|---|---|
| Fuel capacity of CRJ 200 | 6489 kg in total |
| Fuel capacity of left and right wings of CRJ 200 | 2159 kg each |
| Fuel capacity of the center tank of CRJ 200 | 2267 kg |
| CRJ type with a fuel feed anomaly | CRJ-900 |
| CRJ type with ferry tanks installed in the passenger cabin | CRJ-200 |
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What You'll Learn
- CRJ-200 fuel capacity is 6489 kg, with the centre tank holding 2267 kg
- CRJ-900 has a fuel feed anomaly, with a sticking valve causing a fuel imbalance
- CRJ's have ferry tanks installed in the passenger cabin for longer flights
- CRJ's have two methods of crossflow, which were off during the anomaly
- The CRJ's collector cell filling system differs from the Dash 8
CRJ-200 fuel capacity is 6489 kg, with the centre tank holding 2267 kg
The Bombardier CRJ200 is a regional jet designed and manufactured by Bombardier Aerospace between 1991 and 2006. The CRJ200 has a maximum fuel capacity of 6489 kg. The left and right wings can each hold 2159 kg of fuel, while the centre tank can hold 2267 kg. This brings the total fuel capacity of the CRJ200 to 6489 kg.
The CRJ200 is an improvement on the CRJ100, featuring more efficient GE CF34-3B1 engines, which offer lower fuel consumption and increased cruise speed and altitude. The CRJ200 is a 50-seat aircraft, typically requiring a flight crew of two pilots and accommodating a maximum of 55 occupants, including flight attendants.
The CRJ family originated from the design of the earlier Canadair Challenger business jet. The Challenger featured a relatively wide fuselage that could seat two passengers on each side of a central aisle. This design suggested that it would be possible to stretch the aircraft to accommodate more seats, leading to the development of the Challenger 610E, which would have included seating for an additional 24 passengers. However, this lengthening plan was terminated, and the CRJ program was launched in early 1989.
The CRJ200 has been utilised for various routes, including SVH-SLN-ONT and TUL-ONT, with a range of 1235 miles. To extend the range of the CRJ200, ferry tanks can be installed in the passenger cabin, as seen in flights from SFO to HNL. These ferry tanks require a mechanic on board to transfer fuel to the main tanks during the flight.
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CRJ-900 has a fuel feed anomaly, with a sticking valve causing a fuel imbalance
The CRJ-900 is a type of regional jet aircraft that, like other aircraft, relies on a balanced distribution of fuel across its tanks for optimal performance. However, in certain rare circumstances, a fuel feed anomaly may occur, leading to a fuel imbalance.
In the scenario described, the CRJ-900 experiences a fuel feed anomaly due to a sticking valve. This anomaly specifically involves the check valves located in the fuel system. Check valves are crucial components in aircraft fuel systems as they control the flow of fuel and ensure it moves in the correct direction.
The CRJ-900's fuel system includes a left pump and a right pump located in the collector tank, followed by check valves that connect to each of the fuel tanks. In normal operation, these check valves open and close at the appropriate times to maintain the desired fuel distribution.
However, in this case, one of the check valves is sticking open. When only one engine is running, this stuck-open valve allows fuel to transfer rapidly from one tank to the other. This rapid transfer can trigger a fuel imbalance message, indicating that the aircraft's computer system has detected an abnormal distribution of fuel.
The issue with the sticking valve can lead to operational challenges and potential safety concerns. It is important to address such fuel feed anomalies promptly through proper troubleshooting and maintenance procedures to ensure the safe and efficient operation of the aircraft.
To rectify this issue, maintenance technicians would need to refer to the aircraft's maintenance manual and follow specific procedures for adjusting or replacing the faulty check valve. By doing so, they can restore the normal operation of the fuel system and ensure the aircraft is safe for flight operations.
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CRJ's have ferry tanks installed in the passenger cabin for longer flights
CRJs, or Canadair Regional Jets, are a type of regional airliner typically used for short-haul flights. However, to enable longer flights, some CRJs have been modified to include additional fuel tanks, known as ferry tanks, installed in the passenger cabin.
The standard fuel system on a CRJ consists of fuel tanks located in the wings and, in some variants such as the CRJ-900, a center tank. The CRJ-200, for example, has a total fuel capacity of 6,489 kg, with each wing tank holding approximately 2,159 kg and the center tank holding approximately 2,267 kg.
By installing ferry tanks in the passenger cabin, the fuel capacity of the CRJ can be extended, allowing for longer flights. This modification is particularly useful for flights between remote locations or for repositioning the aircraft to different bases.
Operating a CRJ with ferry tanks requires additional crew members, including a mechanic to transfer fuel from the ferry tanks to the main fuel tanks during flight. The range extension provided by the ferry tanks enables CRJs to fly routes that would otherwise be beyond their standard fuel capacity.
While the exact details of the ferry tank installation and fuel transfer process may vary, this modification highlights the flexibility of the CRJ platform and its ability to adapt to different operational requirements. The use of ferry tanks is one example of how operators can extend the capabilities of their aircraft to meet specific mission needs.
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CRJ's have two methods of crossflow, which were off during the anomaly
The CRJ series of aircraft are made by Bombardier and are often used for short-haul flights. The CRJ 700/900 models have two methods of crossflow: powered (auto or manual) and gravity.
Powered crossflow is an automatic function managed by the fuel computer. If the automatic crossflow fails to maintain balance, the automatic function can be inhibited to allow manual powered crossflow. If a fuel imbalance of more than 200 pounds exists between fuel tanks, the fuel computer energizes the bidirectional XFLOW pump. Fuel is drawn from the wing tank with the higher quantity and pumped to the low-quantity tank. When the quantity of the low tank exceeds the other tank by 50 lbs, the XFLOW pump is de-energized and the cross flow stops.
If an imbalance occurs that the automatic powered crossflow does not respond to, the pilot can manually override the auto function. This is done by selecting the AUTO OVERRIDE switch to MAN on the FUEL control panel. Manually selecting either the left (L XFLOW) or right (R XFLOW) switchlight starts the XFLOW pump, and the low-quantity tank is replenished. When the wing tank quantities are within limits, selecting the XFLOW switch again will de-energize the XFLOW pump and crossflow stops.
Gravity crossflow is used when the powered crossflow feature doesn't work or can't correct the imbalance. This is done by pressing the GRAVITY XFLOW switchlight on the FUEL control panel, which opens the gravity crossflow valve centred in the gravity manifold between the wing tanks. Fuel movement is affected by level placement on the ground, and transfer rates can be varied in-flight by sideslipping the aircraft.
During the anomaly, both the powered and gravity crossflow methods were off. This may have been due to a failure of the powered crossflow system or because the aircraft was not in flight, as fuel movement in gravity crossflow is affected by level placement on the ground.
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The CRJ's collector cell filling system differs from the Dash 8
The CRJ-900 has a collector cell filling system that differs from the Dash 8. The CRJ's collector cell filling system is designed to mechanically refill the running engine tank whenever the fuel pumps are operational.
The Dash 8, on the other hand, operates differently. When the fuel shutoff valve is turned off, the opposite collector cell begins to empty as the ejector pumps are not in use. If the ejector pumps are fed by engine fuel pump pressure, opening the fuel shutoff valve may not impact this process.
The CRJ's collector cell filling process involves the transfer of fuel from the non-running collector cell to the engine-driven pump (EDP), and then to the running collector cell. Any excess fuel is then returned to the wing tank. This process is facilitated by the boost pumps, which are automatically activated when there is low pressure or a single engine shutdown.
In contrast, the Dash 8's system does not feature a return line from the left engine to the right tank, impacting how excess pressure is managed. This difference in design influences how fuel is distributed and managed within the aircraft's systems, potentially impacting performance and maintenance requirements.
Overall, the CRJ's collector cell filling system differs from the Dash 8 in several key ways, including the direction of fuel flow, the role of the boost pumps, and the management of excess pressure and fuel. These distinctions contribute to the unique characteristics and operational procedures of each aircraft.
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Frequently asked questions
The CRJ series appears to have multiple fuel tanks, including left and right wing tanks, a center tank, collector tanks, and ferry tanks installed in the passenger cabin.
The CRJ-200 has a total fuel capacity of 6489 kg. The left and right wings can each hold around 2159 kg, and the center tank can hold approximately 2267 kg.
Yes, there may be range-extending modifications available for CRJs. For example, some CRJ-200 aircraft have been flown with ferry tanks installed in the passenger cabin, allowing them to fly longer routes.
The CRJ-900's fuel system is designed to mechanically refill the running engine tank whenever the fuel pumps are running. The ejector pumps are fed by the engine-driven pump, and the boost pumps kick in when there is low pressure or one engine shuts down.
A fuel feed anomaly on the CRJ-900 could be due to a stuck open valve, causing a fuel imbalance between the left and right tanks. Another possible cause could be related to the crossflow settings, affecting how fuel is transferred between tanks.
