2A6X1 Vol. 5 Ure's (Mfe)

Using the wrong cleaning agent on a jet engine part could destroy it. Jet engine parts are made of delicate materials that can be easily damaged by harsh chemicals or cleaning agents. Using the wrong cleaning agent could cause corrosion, erosion, or other forms of damage to the part, leading to its destruction. It is important to use the correct cleaning agent specifically designed for jet engine parts to ensure their proper maintenance and longevity.

Most engine monitoring gauges and instruments require a transmitter and indicator. These two components work together to provide information about the engine's performance. The transmitter is responsible for converting the engine's measurements into electrical signals, which are then sent to the indicator. The indicator, in turn, displays the information in a readable format for the operator. Without both the transmitter and indicator, the engine monitoring system would not be able to accurately measure and display important data.

When making general entries on the test cell engine log sheet, it is important to verify the engine model and serial number on the engine data plate. This ensures that the correct and accurate information is recorded on the log sheet. By checking the numbers on the engine data plate, any discrepancies or errors can be avoided, and the log sheet can be filled out correctly.

The oil pressure indicator receives an electrical signal from the transmitter. The transmitter is responsible for converting the oil pressure into an electrical signal that can be interpreted by the indicator. This allows the indicator to accurately display the oil pressure level in the system.

To become an expert troubleshooter, it is essential to understand the function of each unit within each system. This knowledge allows the troubleshooter to identify and diagnose problems accurately. Without understanding how each unit operates and contributes to the overall system, it would be challenging to troubleshoot effectively. The other options mentioned, such as being a 7-level, having experience, and attending college courses, may enhance troubleshooting skills but are not as crucial as understanding the function of each unit within each system.

When an engine arrives for a test run at the test cell, it must be operable with all known discrepancies corrected. This means that the engine should be in a condition where it can function properly and all issues or problems that were previously identified have been fixed. This ensures that the engine can be tested accurately and any performance or operational data obtained will be reliable. It also indicates that the engine has undergone necessary repairs or maintenance to address any known problems before the test.

The engine fuel-flow indicating system of most jet powered aircraft consists of a fuel-flow transmitter and a fuel-flow indicator. The transmitter measures the rate at which fuel is flowing to the engine and sends this information to the fuel-flow indicator. The indicator then displays this information to the pilot, allowing them to monitor the fuel consumption of the aircraft.

The correct answer is transmitter and indicator. The oil pressure transmitter measures the pressure in the oil system and sends a signal to the oil pressure indicator, which displays the pressure reading. These two units work together to indicate whether the oil system is operating correctly.

A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of generating an electric charge when subjected to mechanical stress or vibration. This makes them ideal for use in vibration transducers, as they can convert mechanical vibrations into electrical signals. Therefore, a piezoelectric accelerometer is the correct answer for the type of vibration transducer made up of certain ceramic compounds and natural crystals.

The correct answer is troubleshooting charts. Aircraft power plant and engine intermediate maintenance technical orders (TO) provide information on troubleshooting. This information is typically presented in the form of troubleshooting charts, which help technicians identify and resolve issues with the power plant and engine systems. These charts outline a step-by-step process to diagnose and fix problems, making them an essential resource for maintenance personnel.

Engine manufacturers determine the expected duration that a specific part should last through extensive testing. This duration is referred to as the "service life." It indicates the estimated lifespan of the part before it is expected to fail or require replacement.

A visual inspection of the combustion chamber on a disassembled engine is preferred over a borescope inspection because it allows for the possibility of spotting defects that may have been missed with the borescope. This suggests that a visual inspection provides a more comprehensive view of the combustion chamber, potentially revealing any hidden or subtle defects that the borescope may have overlooked.

The correct answer is individuals assigned. The responsibility for the proper preventive maintenance of a test cell facility rests with the individuals who are assigned to it. This means that it is the responsibility of the specific individuals who are assigned to the test cell facility to ensure that preventive maintenance is carried out effectively and regularly. This may include tasks such as regular inspections, cleaning, and servicing of equipment to prevent any potential issues or breakdowns.

After a specific or unusual condition occurs, maintenance personnel conduct a special inspection. This inspection is carried out to evaluate the condition and determine any necessary repairs or adjustments. Unlike regular inspections, special inspections focus on addressing the specific issue that occurred and ensuring that it is properly resolved.

The control tower is the correct answer because it is responsible for monitoring and controlling all aircraft movements within the airport's airspace. They have access to real-time information such as temperature and barometric pressure through sophisticated equipment and weather monitoring systems. The control tower provides crucial weather updates to pilots, ensuring safe and efficient operations.

Failure of internal parts is not considered a cause of foreign object damage (FOD) because FOD refers to damage caused by foreign objects that are not part of the aircraft or its components. Formation of ice, ingestion of rocks, and ingestion of bolts are all examples of foreign objects that can cause FOD. However, failure of internal parts is a mechanical issue within the aircraft itself and is not considered a foreign object.

The correct answer is fixed and portable. This is because the question asks for the two types of test cells currently used in the Air Force, and the options provided are fixed and portable, single and combined, permanent and temporary, and functional and progressive. Out of these options, only fixed and portable are types of test cells.

A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, an indicator, and a resistor. The resistor is a crucial component in the system as it helps to calibrate and regulate the temperature readings from the thermocouples. It is used to provide a known reference temperature for comparison, allowing accurate measurement and indication of the EGT. Without the resistor, the system would not be able to provide reliable and consistent temperature readings, making it an essential part of the EGT indicating system.

Bearings are used to support the fan and low pressure turbine. Bearings are mechanical components that reduce friction between moving parts and support the load. In this case, they provide support to the fan and low pressure turbine, allowing them to rotate smoothly. Without bearings, the fan and turbine would experience increased friction, leading to excessive wear and decreased efficiency. Therefore, bearings play a crucial role in supporting and maintaining the proper functioning of these components.

Transient engine vibration refers to vibrations that occur for a short duration and then disappear. These vibrations are typically caused by temporary factors such as changes in operating conditions or the interaction of different engine components. Unlike other types of engine vibrations like forced, resonance, or externally excited, transient vibrations are not persistent and do not continue for an extended period.

Foreign object damage (FOD) refers to any damage caused by foreign objects, such as debris or particles, entering the engine. The turbine area is the part of the engine where combustion occurs and where the turbine blades are located. It is a critical area that is susceptible to FOD, as any foreign objects entering this area can cause damage to the turbine blades, leading to engine malfunction or failure. Therefore, prior to operation on the test cell facility, it is important to check the turbine area for any signs of FOD to ensure the engine's proper functioning.

The correct answer is the accessory gearbox. To borescope the high-pressure turbine (HPT) rotor blades, the rear compressor needs to be rotated. This rotation is achieved by using the core engine rotating device, which is connected to the accessory gearbox. Therefore, the accessory gearbox is the component that allows for the rotation of the rear compressor, enabling the borescoping of the HPT rotor blades.

Before moving an aircraft into the hush house, it is necessary to inspect the aircraft and its forms. This means that not only the physical condition of the aircraft should be checked, but also any required documentation or paperwork related to the aircraft should be reviewed. This ensures that the aircraft is in proper working order and that all necessary paperwork is in order before it is moved into the hush house.

The engine start system (ESS) tester is used to troubleshoot a jet fuel starter (JFS) problem on an F-16 aircraft. This test equipment is specifically designed to diagnose and analyze the functionality of the engine start system, which includes the jet fuel starter. By using the ESS tester, technicians can identify any issues or malfunctions within the JFS and perform necessary repairs or maintenance to ensure proper functioning of the aircraft's engine start system.

Dry motoring is the correct answer because it is an operational check that allows starting the Jet Fuel Start (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. This check is performed to ensure that the JFS is functioning properly and can provide the necessary airflow and pressure to start the engine. By using dry motoring, the JFS can be tested without the risk of starting the engine or introducing fuel into the system.

The fuel-flow indicator is a device that measures the rate at which fuel is flowing through the system. It provides information about the amount of fuel consumed over a specific period of time. The most commonly used unit for measuring fuel flow is pounds per hour, as it provides a standardized measurement across different aircraft and fuel types. This allows pilots and maintenance personnel to accurately monitor fuel consumption and make informed decisions regarding fuel management.

The engine remote trimmer allows you to adjust the fuel control without needing to be physically under the engine. This means that you can make changes to the fuel control system from a remote location, which is convenient and safer than having to access the engine directly.

The engines are mounted from a cradle mount. This means that the engines are secured and supported by a cradle-like structure. This method allows for stability and ease of testing, as the engines can be easily attached and detached from the cradle mount. It also ensures that the engines are securely held in place during testing, preventing any movement or accidents.

Understanding the operating principles of engine instruments is important in order to interpret the readings they provide. By understanding the meanings of the instrument readings, one can determine the current condition and performance of the engine. This knowledge is crucial in making decisions such as whether the engine should be removed from the aircraft or sent to the test cell for further evaluation. Additionally, understanding the instrument readings can also help identify any maintenance or repair needs and determine the tools required for maintenance.

Thermal cycles refer to the repeated heating and cooling of the combustion chamber in an engine. These cycles cause expansion and contraction of the materials, which can lead to the formation or worsening of defects such as cracks. As the chamber heats up and cools down, the stress on the materials increases, making them more susceptible to damage. Therefore, thermal cycles aggravate the defects that appear on the combustion chamber.

The tachometer indicating system consists of two primary units: the tachometer generator and the tachometer indicator. The tachometer generator is responsible for generating the electrical signal based on the rotational speed of the engine. This signal is then sent to the tachometer indicator, which displays the RPM (revolutions per minute) of the engine on a gauge or digital display. Therefore, the correct answer is "indicator" as it is one of the primary units of the tachometer indicating system.

Periodic inspection checklists are used as an aid in test facility inspections. These checklists provide a systematic and comprehensive list of items that need to be inspected during a specific period. They ensure that all necessary areas, equipment, and procedures are thoroughly examined and meet the required standards. By using periodic inspection checklists, test facility inspectors can easily track and document any issues or deficiencies, allowing for timely corrective actions to be taken.

Inspecting other areas after isolating the trouble between points is not a proper troubleshooting practice because it can lead to wasting time and resources. Once the trouble has been isolated between specific points, it is more efficient to focus on those points and perform targeted checks and inspections to identify the root cause of the problem. Inspecting other areas before fully understanding the issue between the identified points can cause unnecessary confusion and delay in resolving the problem.

If an engine stalls or surges during a test cell run, the variable stator vanes should be investigated. Variable stator vanes are responsible for controlling the airflow and pressure within the engine. If these vanes are malfunctioning or not operating correctly, it can cause disruptions in the engine's performance, leading to stalling or surging. Therefore, investigating the variable stator vanes is crucial in identifying and resolving the issue.

When conducting vibration analysis, it is necessary to measure all parameters to identify a vibration source because displacement alone may not provide enough information. Displacement refers to the distance an object moves from its equilibrium position during vibration. However, different vibration sources can result in the same displacement, making it difficult to pinpoint the exact cause of the vibration. By measuring all parameters such as frequency, amplitude, and phase, a more comprehensive analysis can be performed, allowing for a more accurate identification of the vibration source.

During combustion chamber borescope inspections, defects such as cracks are continually monitored as long as they are within limits. This means that if the defects do not exceed the acceptable limits set by the inspection criteria, they do not require immediate action such as engine removal or welding. However, they are still monitored to ensure that they do not worsen or exceed the limits in the future. Replacing the part is only necessary if the defects become unacceptable and exceed the specified limits.

The correct answer is "after the last flight of the flying period." A basic post-flight inspection (BPO) is conducted after the last flight of the flying period to ensure that the aircraft is in a safe and operational condition before it is parked or stored. This inspection allows for any issues or damages that may have occurred during the flight to be identified and addressed before the aircraft is used again. Conducting the BPO after the last flight of the flying period ensures that the aircraft is thoroughly inspected and ready for the next day's operations.

The exhaust nozzle position indicating system found on engines with afterburners is important because it helps the pilot determine engine power. This system provides the pilot with information about the position of the exhaust nozzle, which directly affects the engine's thrust output. By knowing the position of the nozzle, the pilot can accurately gauge the amount of power being produced by the engine, allowing for better control and optimization of engine performance.

After running an engine in augmentation in the hush house, the augmentor tube needs to be cooled down. This is done by running the engine at idle for a period of 3 minutes. This allows the hot gases in the augmentor tube to dissipate and the temperature to decrease, preventing any potential damage or overheating. Running the engine at idle for a longer period of time, such as 6 or 9 minutes, may not be necessary and could waste fuel and time. Running the engine at idle for only 1 minute may not be sufficient to fully cool down the augmentor tube.

When troubleshooting an aircraft/engine issue, it is important to start by observing gauge indications. This is because gauge indications provide valuable information about the performance and condition of various systems. By observing the gauge indications, one can identify any abnormalities or deviations from normal operating parameters, which can help in narrowing down the potential causes of the problem. This initial step can save time and effort by providing a starting point for further investigation and troubleshooting.

The correct answer is AFOSH STD 91-100. This document provides written instructions for safe flight line vehicle operations. The other options listed are not specifically related to flight line vehicle operations. AFI 36-2903 is the Air Force instruction for dress and appearance of Air Force personnel. The flight line job guide (JG) is a general guide for various job duties on the flight line. The intermediate maintenance TO (Technical Order) is a manual for maintenance procedures and operations. Therefore, AFOSH STD 91-100 is the most relevant document for safe flight line vehicle operations.

The TF39-1C testing engine is equipped with a quick engine change (QEC) kit.

During an inspection of the hush house, the engine being tested does not need to be checked. This is because the purpose of the hush house is to reduce noise and contain the sound of the engine being tested. Therefore, it is assumed that the engine is already in proper working condition and does not need to be inspected during this specific inspection.

The engine pressure ratio (EPR) is used to indicate the amount of thrust a dual-compressor engine is producing. EPR is a measure of the pressure difference between the compressor inlet and the turbine outlet, which directly relates to the engine's performance and thrust output. By monitoring the EPR, pilots and engineers can assess the engine's efficiency and make necessary adjustments to optimize its performance.

The correct answer is two silver contacts. The overheat detector unit on aircraft engines consists of a hollow stainless-steel tube that covers two silver contacts. These contacts are designed to detect excessive heat and trigger a warning or shut off the engine if necessary. The silver contacts have good electrical conductivity and are able to accurately detect temperature changes, making them suitable for this application.

In the fixed test cell, the air for the engine intake comes through baffles located on the ceiling of the test cell. This means that the air is being drawn in from the top of the test cell. The baffles help to control the flow of air and ensure that it is directed towards the engine intake. By having the intake located on the ceiling, it allows for a more efficient and controlled airflow into the engine.

Periodic (PE) inspections are done on aircraft parts that require infrequent inspections. These inspections are carried out at specified intervals, usually based on flight hours, calendar time, or cycles, to ensure the continued airworthiness of the aircraft and its components. These inspections involve a thorough examination of various systems, structures, and components to identify any signs of wear, damage, or deterioration that may affect the safe operation of the aircraft.

The filter selector switch on the vibration analyzer allows the user to choose the appropriate filter for analyzing the vibration data. Different filters can be used to isolate specific frequencies or remove unwanted noise from the signal. By selecting the necessary filter, the user can ensure that the vibration data is accurately analyzed and any relevant information is obtained.

The vibration pickups on the portable test cell are cooled by the pneumatic system. This means that the pneumatic system is responsible for cooling the vibration pickups. It is likely that the pneumatic system has a cooling mechanism or feature that allows it to cool the pickups effectively. This could be through the circulation of air or some other method. The other options, such as engine oil, the atmosphere, and hydraulic fluid, are not mentioned as being responsible for cooling the pickups, so they are not the correct answer.

Engines that have been involved in an incident or a mishap need to be tested in addition to determining the condition of a repaired or overhauled engine. This is because the incident or mishap may have caused damage or affected the performance of the engine. Testing these engines is important to ensure their functionality and safety before they are put back into service. The other options mentioned, such as training practice, in aircraft that have been washed, or with severe foreign object damage, may also require engine testing, but the primary focus in this case is on engines that have been involved in an incident or mishap.