CDC 2A651 Volume 3 Engine Systems (Q 35-50

Microscopic metallic particles in the oil system are called wear metals. These particles are generated due to the friction and wear between moving parts in the system. Over time, these wear metals can accumulate and cause damage to the components of the system. Monitoring and analyzing the concentration of wear metals in the oil can provide valuable information about the condition and health of the machinery.

The valve that allows fluid to flow in only one direction is called a check valve. This type of valve is designed to prevent backflow or reverse flow of fluid, ensuring that it can only flow in one direction. It typically consists of a flap or a ball that opens when the fluid flows in the desired direction and closes to block the flow in the opposite direction. Check valves are commonly used in plumbing systems, water pumps, and various industrial applications to maintain the proper flow direction and prevent any potential damage or contamination.

The project monitor is responsible for ensuring that the OAP (Operational Analysis Plan) operates properly. They oversee the project and monitor its progress, making sure that all aspects of the plan are being executed effectively. They may coordinate with various teams and stakeholders to ensure that the project is on track and meeting its objectives. The project monitor plays a crucial role in ensuring the success of the OAP.

The oil pump check valve prevents oil in the oil tank from draining into the RGB rear case. This valve ensures that oil flows in one direction only, preventing any backflow or leakage. It acts as a barrier, allowing oil to be pumped into the RGB rear case but preventing it from flowing back into the oil tank. This helps maintain proper lubrication and prevents any potential damage or malfunction caused by oil leakage.

There are two scavenge oil pumps located in the RGB.

The AE2100D3 PUAD lube and scavenge pump provides approximately 5 GPM at engine PTO.

The primary benefit of identifying an impending failure through the OAP is improved safety. By detecting potential failures in advance, necessary measures can be taken to prevent accidents or injuries. This ensures a safer environment for both personnel and equipment. While increased component life, reduced maintenance cost, and increased equipment availability are also important benefits of the OAP, the focus on safety takes precedence as it directly impacts the well-being of individuals and minimizes the risk of accidents.

Oil sampling intervals should not vary by more than 10%. This means that the time between each oil sampling should not differ by more than 10% of the average sampling interval. Consistency in sampling intervals is important to ensure accurate and reliable oil analysis results. If the intervals vary too much, it can lead to inconsistent data and make it difficult to identify trends or detect potential issues in the oil. Therefore, it is recommended to maintain a maximum variation of 10% in oil sampling intervals.

The correct answer is "Gear." The T56 engine uses a gear-type oil pump. This type of pump utilizes gears to create suction and draw oil into the pump, which is then distributed to lubricate various engine components. Gear pumps are known for their durability and reliability, making them a common choice in many engines, including the T56.

The correct answer is flap actuator. The flap actuator is responsible for regulating the amount of ram air passing through the oil cooler core. It controls the position of the flap, which in turn controls the airflow. By adjusting the position of the flap, the flap actuator can increase or decrease the amount of air passing through the oil cooler core, helping to regulate the temperature of the oil and prevent overheating.

The GMAD (Gearbox Mounted Accessory Drive) is the component that drives the PGB (Power Gearbox) lube and scavenge pump. This pump is responsible for lubricating and removing oil from the power gearbox, ensuring proper functioning and longevity of the system. The Alternator stator, PGB, and PUAD (Power Unit Accessory Drive) are not directly involved in driving the PGB lube and scavenge pump.

SEM/EDX analysis requires that the particles being analyzed are free from oil. This is different from conventional oil analysis, where the presence of oil is expected and analyzed. SEM/EDX analysis focuses on providing results related to the condition of equipment and components, rather than analyzing the oil itself. The other options are not major aspects that differentiate SEM/EDX analysis from conventional oil analysis.

The dual-port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the mid and center sleeve bearings. This means that the oil jet is responsible for providing lubrication to these specific bearings, which are located in the power unit oil system.

The power section and RGB oil systems are joined together at the external scavenge oil filter. This filter is responsible for removing any contaminants or impurities from the oil before it is circulated back into the system. By joining the power section and RGB oil systems at this point, it ensures that both systems are receiving clean and filtered oil, which helps to maintain the overall efficiency and performance of the engine.

The journeyman must be aware of the toxicity of modern jet engine oil because it can pose a health risk if not handled properly. Jet engine oil contains chemicals that can be harmful if inhaled, ingested, or come into contact with the skin. Therefore, it is important for the journeyman to understand the potential hazards associated with the toxicity of the oil and take appropriate safety precautions to protect themselves and others.

The augmentation valve is responsible for increasing the airflow through the cooler. It is a component that regulates the airflow and allows more air to pass through, which helps in cooling the system efficiently. The flap actuator, oil cooler flap, and augmentation ejector do not have a direct role in increasing the airflow through the cooler.