CDC 2a353 Volume 5. F-22

Outer mold line inspection will be accomplished on the F-22 when maintenance notices low observable damage. This means that when there is any damage or wear and tear that affects the aircraft's stealth capabilities or its ability to remain undetectable, an outer mold line inspection will be conducted. This is important to ensure that the F-22 maintains its low observable characteristics and remains effective in its missions. The other mentioned issues such as hydraulic spills, worn nose landing gear tire, and fuel leaks may require different maintenance actions, but they do not specifically relate to the low observable characteristics of the aircraft.

The correct answer is "Damage to doors or airframe." This is because if the doors on the F-22's weapons bay are not slowed down prior to reaching travel limits, they could potentially cause damage to the doors themselves or the overall structure of the aircraft. Slowing down the doors helps to prevent any potential harm or wear and tear that could occur during the opening or closing process.

The walk around inspection is the correct answer because it is conducted within six hours of launch and only if the preflight has been completed over 48 hours ago but is still valid. This inspection involves visually inspecting the aircraft's exterior for any signs of damage or abnormalities, ensuring that all components are in place and functioning properly. It is a routine check to ensure the aircraft's airworthiness before every flight.

The correct answer is the differential pressure indicator. The differential pressure indicator on the F-22 provides the maintainer with an indication that the filter element requires replacement. This indicator measures the difference in pressure between the clean side and dirty side of the filter. When the pressure difference reaches a certain threshold, it indicates that the filter is becoming clogged and needs to be replaced to maintain optimal performance and efficiency.

IMIS, which stands for Integrated Maintenance Information System, is a software that displays input screens for the maintainer to enter fault identification codes. These codes help in identifying and categorizing the faults or issues in the system. By entering the fault identification codes into IMIS, the maintainer can document and track the faults, allowing for efficient troubleshooting and maintenance of the airframe or turbine engine. "Fault identification codes" is the correct answer as it aligns with the purpose and functionality of IMIS.

FADEC (Full Authority Digital Engine Control) and CEDU (Central Engine Data Unit) are the components on the F-22 that handle the on-board engine monitoring diagnostic functions. FADEC is responsible for controlling and managing the engine's performance and efficiency, while CEDU collects and processes data from various sensors to monitor the engine's health and diagnose any issues. Together, these components ensure that the engine is functioning optimally and any potential problems are detected and addressed promptly.

Rotating the barrels in the F-22 weapon system helps to minimize barrel erosion and heat generation. This rotation distributes the wear and tear more evenly across the barrels, preventing excessive erosion in one specific area. By reducing barrel erosion and heat generation, the overall lifespan of the system is extended, leading to increased durability and effectiveness.

The spring loaded lever on the F-22 prevents the maintainer from installing the filter bowl without a filter element inside. This lever ensures that the filter element is securely in place before the filter bowl is installed. Without the filter element, the lever will not engage properly, preventing the filter bowl from being installed. This safety measure ensures that the filter is correctly installed and functioning effectively.

When the F-22 hydraulic pressure is lost, the ailerons are aerodynamically centered. This means that without hydraulic pressure, the ailerons will automatically align themselves in a neutral position, ensuring that the aircraft remains stable and balanced. This allows the pilot to maintain control of the aircraft even in the absence of hydraulic assistance.

The F-22 pitch system is augmented by thrust vector nozzles. These nozzles are designed to redirect the exhaust gases from the engines, allowing the aircraft to change its pitch or angle of attack. By manipulating the direction of the exhaust, the thrust vector nozzles provide additional control and maneuverability to the F-22, enabling it to perform complex aerial maneuvers and maintain stability in flight.

The F-22's PMA battery pack can increase the battery life in cold temperatures and facilitate effective charging of the battery with the use of an internal heater. Cold temperatures can negatively affect battery performance, so the internal heater helps to keep the battery at an optimal temperature for efficient operation. By maintaining the battery's temperature, the internal heater ensures that the battery can provide power for a longer duration and can be effectively charged when needed.

The valve that allows aerial refuel flow to the aircraft plumbing and prevents flow in the reverse direction is called the check valve. This valve ensures that fuel can flow into the aircraft during aerial refueling but prevents any backflow or reverse flow of fuel.

The correct answer is the Auxiliary power unit. The Auxiliary power unit is responsible for providing pneumatic, hydraulic, and electrical power to the F-22 during emergencies and within its operating envelope. It serves as a backup power source in case the main engines fail or are shut down.

The air storage bottles on the F-22 provide air to the emergency gear extension system. In case of an emergency, when the normal gear extension system fails, these air storage bottles supply the necessary air pressure to extend the landing gear. This ensures that the aircraft can safely land even in situations where the normal gear extension system is not functioning properly.

The software on the F-22 performs the BIT (Built-In Test) on the hydraulic components. This software is responsible for conducting self-diagnostic tests on the hydraulic system to detect any faults or malfunctions. It is designed to identify and indicate any issues with the hydraulic components, ensuring that they are functioning properly.

The correct answer is stainless steel because it is a durable and heat-resistant material that can effectively protect the wheels and tires from excessive brake heat on the F-22 aircraft. Stainless steel is known for its corrosion resistance and ability to withstand high temperatures, making it an ideal choice for this application.

The correct answer is PMA. PMA stands for Portable Maintenance Aid, which is the primary integrated maintenance information tool used by F-22 technicians during the performance of maintenance tasks. It provides technicians with access to essential maintenance information, including technical manuals, maintenance procedures, and troubleshooting guides. The PMA helps technicians diagnose and resolve issues efficiently, ensuring the aircraft's optimal performance and safety.

The F-22 MVI cable is responsible for providing the electrical interconnect between the PMA and the aircraft. This suggests that the cable is used to establish a connection between the PMA (possibly a Portable Maintenance Aid or a similar device) and the aircraft itself. The other options, such as Data dock, Server unit, and Work station adapter, do not seem to be directly related to the interconnect between the PMA and the aircraft.

The F-22 uses a PAO (Polyalphaolefin) cooling cart for avionics cooling during ground maintenance. PAO is a type of synthetic oil that has excellent thermal properties and is commonly used for cooling systems in aircraft. The cooling cart is designed to circulate the PAO fluid through the avionics system, effectively dissipating heat and maintaining optimal operating temperatures. This method ensures that the avionics components are kept cool and protected while the aircraft is on the ground for maintenance.

The F-22 uses various methods for temperature control, including bleed air, ram air, polyalphaolefin, and fuel. Fuel is an essential component in the F-22's temperature control system as it helps regulate the temperature of the aircraft. It is likely used in conjunction with other methods to maintain the desired temperature levels within the aircraft.

The external canopy control switch on the F-22 is located in the nose wheel well. This means that the switch can be accessed and operated from this specific area of the aircraft.

The oil level on the F-22's PDU is checked by a sight glass. A sight glass is a transparent glass window that allows visual inspection of the oil level without the need to open or dismantle any part of the system. It provides a convenient and accurate way to monitor the oil level in real-time, ensuring that it is at the desired level for proper functioning of the aircraft.

The F-22's engine fan variable vanes position is controlled by an actuator. An actuator is a device that converts energy into motion, allowing it to control the position of the variable vanes. It is responsible for adjusting the vanes to optimize engine performance and airflow. This allows the engine to operate efficiently at different speeds and conditions. The actuator receives signals from the aircraft's control system, enabling precise control over the vanes' position and ensuring optimal engine performance during flight.

The function of the PMA that shows a listing of all discrepancies and warnings for a particular aircraft is the functional category of Aircraft forms. This means that the PMA provides a comprehensive list of all issues, discrepancies, and warnings related to a specific aircraft. By using this function, maintenance personnel can easily track and manage the maintenance and repair needs of the aircraft, ensuring its safe operation.

The correct answer is "Normal, manual, and emergency". This answer accurately identifies the three methods for opening the F-22 canopy. The "Normal" method refers to the standard procedure for opening the canopy, likely using electrical or mechanical mechanisms. The "Manual" method suggests a backup option that can be used in case the normal method fails, possibly requiring physical effort from the pilot. The "Emergency" method implies a last resort option, which may involve specialized tools or procedures to quickly open the canopy in urgent situations.

The given correct answer states that the manual operation of the F-22 canopy can be opened or closed in less than three minutes. This means that it takes a relatively short amount of time to perform this task using a high speed/low torque, non-impact type pneumatic or battery powered tool.

The correct answer is Portable maintenance aid and pilot vehicle interface. These are the two ways maintainers can start the F-22 APU. The portable maintenance aid is a handheld device that allows maintainers to perform various diagnostic and maintenance tasks on the aircraft. The pilot vehicle interface is a control panel located in the cockpit that provides the pilot with the ability to start and control the APU. Both of these methods are essential for starting the APU and ensuring its proper functioning.

The F-22 pylons are designed for two different configurations: ferry and combat. The ferry configuration is used when the aircraft is being transported over long distances, typically without any weapons or external fuel tanks attached. In this configuration, the pylons are empty and ready to be loaded with weapons upon arrival. The combat configuration, on the other hand, is used during actual combat missions. In this configuration, the pylons are loaded with weapons and external fuel tanks to enhance the aircraft's combat capabilities.

The correct answer is "aircraft structural maintenance." This is because aircraft structural maintenance refers to the maintenance and repair of the physical structure and components of the aircraft. As the responsibility for low observable maintenance on the F-22 rests with this role, it suggests that they are responsible for maintaining the stealth capabilities of the aircraft, which involves ensuring that the aircraft's surfaces and structures remain undetectable by radar.

The F-22 diagnostics are controlled by the Global manager software. This software is responsible for managing and monitoring the diagnostics of the F-22 aircraft. It allows for comprehensive analysis of the aircraft's systems and helps in identifying any issues or faults. The Global manager software provides a centralized platform for maintenance personnel to access and control the diagnostics of the F-22, ensuring efficient and effective maintenance operations.

The return ground service coupling quick disconnect provides an alternate method to fill the hydraulic reservoir on the F-22 hydraulic system. This coupling allows for the hydraulic fluid to be returned to the reservoir, while also providing a means to fill the reservoir with new fluid. This ensures that the hydraulic system remains properly filled and functioning efficiently.

The F-22 aircraft utilizes a brake control system that consists of a base plate and two interchangeable brake modules. This system is responsible for controlling and regulating the braking function of the aircraft. The base plate serves as the foundation for the brake control system, while the interchangeable brake modules provide the necessary components and mechanisms to enable efficient and effective braking. This setup allows for flexibility and ease of maintenance, as the brake modules can be easily replaced or interchanged as needed.

The correct answer is electrically. The F-22 arresting gear system is controlled and actuated using electrical power. This means that the system relies on electricity to operate and control its functions. The use of electrical power allows for precise and efficient control of the arresting gear system, ensuring smooth and accurate operation.

The correct answer is a removable disk drive. This component is necessary for the installation of software updates and maintenance on the PMS (Power Management System) of the F-22. It allows for the easy insertion and removal of disks containing the required data and programs. The battery pack is another important component, providing power to the PMS, while DTC (Digital Test Console) and DMS (Data Management System) are not specifically mentioned as necessary components for the PMS installation.

In emergency flight mode, the F-22 uses the pneumatic backup system to pressurize the unlock devices and release the landing gear for extending and locking it into position. This mode is specifically designed for emergency situations where the normal flight mode may not be feasible or safe. It ensures that the landing gear can be quickly and reliably extended and locked in place, allowing for a safe landing in emergency scenarios.

The F-22 nose wheel can be turned up to 48 degrees depending on the main landing gear wheel speed. This means that the angle at which the nose wheel can be turned is determined by how fast the main landing gear wheels are rotating. The faster the wheels are spinning, the greater the angle at which the nose wheel can be turned. This is an important factor in maneuvering the aircraft during landing and takeoff, as it allows for better control and steering.

The correct answer is CEDU. The explanation for this is that the given sentence mentions that vibrations, oil debris, oil level signals, along with condition monitoring and fault information are stored in the F-22's resident memory. Out of the given options, CEDU is the most plausible choice as it stands for Centralized Engine Data Unit, which is responsible for collecting and storing data related to the engine's performance and health. Therefore, it is logical to assume that the mentioned information would be stored in the CEDU.

The flight control computer is responsible for generating commands for various components such as the primary flight control surfaces, engine inlet bypass louvers, nose wheel steering, engine thrust, and thrust vectoring. It is a crucial part of the aircraft's flight control system, ensuring that the pilot's inputs are translated into appropriate control actions. The flight control computer receives inputs from the pilot and other systems, processes them, and sends commands to the respective components to achieve desired flight maneuvers and control the aircraft.

When the user selects the discrepancy they have been assigned to work, they are granted access to the required technical data. This means that the user can only access the necessary information for resolving the specific discrepancy they have been assigned. By linking the access to the discrepancy, the system ensures that users only have access to relevant technical data, increasing efficiency and preventing unauthorized access to sensitive information.

The F-22 cockpit distribution and defog system is responsible for providing air for various functions, including the canopy seal, cockpit pressurization, canopy defog, and the pilot's thermal cooling garment. This means that the system ensures that the pilot's thermal cooling garment receives the necessary airflow to keep the pilot cool during flight.

The APU shutdown switch needs to be in the NORM position in order to start the APU using the PMA. This position allows the APU to be started and run normally. If the switch is not in the NORM position, the APU may not start or function properly.

The correct answer is 0 to 5000 psig. This means that the pressure transducer on the F-22 aircraft is designed to operate within a pressure range of 0 to 5000 pounds per square inch gauge. This range allows the transducer to accurately measure and monitor the pressure within the aircraft's systems, ensuring safe and efficient operation.

The correct answer is the optical fire detection system. In the event of a fire in the F-22 engine or APU compartment, the optical fire detection system is responsible for reporting the presence of the fire to the fire protection module. This system uses optical sensors to detect the presence of flames or smoke, allowing for quick and accurate detection of fires in the aircraft.

The correct answer is flap alt switch. The explanation for this is that the flap alt switch on the F-22s controls the flap setting when the norm mode is selected. This switch allows the pilot to adjust the position of the flaps based on the altitude of the aircraft. It is a built-in switch specifically designed for this purpose, and it ensures that the flaps are set correctly for optimal performance during different flight conditions.

Emergency gear swings and arresting gear operations reduce the number of starts for the F-22 SES. This means that instead of having to start the system multiple times, these operations help in minimizing the number of times the SES needs to be started. This could be due to the fact that emergency gear swings and arresting gear operations provide a smoother and more controlled transition for the SES, resulting in fewer instances where a restart is required.

The correct answer is IVSC. The IVSC stands for Integrated Vehicle Systems Computer, which is responsible for hosting the hydraulic system on the F-22. This computer monitors and controls various systems, including the hydraulic system, to ensure the proper functioning of the aircraft.

The trusted path menu is the correct answer because it ensures secure and reliable communication for all PMS screens. A trusted path menu is a feature that provides a secure environment for sensitive operations by restricting access to authorized users and preventing unauthorized access or tampering. By using the trusted path menu, PMS screens can communicate without the risk of interception or manipulation, ensuring the integrity and confidentiality of the communication.

The portable maintenance aid is the primary source for introducing the F-22's operational flight program. This device is designed to assist in the maintenance and operation of the aircraft. It likely contains the necessary software and data to update and install the flight program onto the F-22. The other options listed, such as the data processing unit, maintenance aid, and data transfer cartridge, may have supporting roles in the overall maintenance process but are not specifically mentioned as the primary source for introducing the flight program.

The hydraulic system's pump on the F-22 has an output pressure range of 4050 to 4150 psi.

The valve that allows free castering of the nose wheel in the F-22 nose wheel steering system is the control valve. This valve is responsible for regulating the flow of hydraulic fluid to the nose wheel, allowing it to move freely and steer in different directions. It controls the movement of the nose wheel without any restrictions, providing smooth and precise steering capabilities to the aircraft.