Turbine Engine Overhaul Practice Test

These questions are part of the practice quiz. Start practicing

• What is another name for shop maintenance?
• Maintaining cleanliness of parts and shop environment helps prevent which issue?
• How many defects may occur to an overheated turbine blade?
• What should be used when handling bearings and why?
• What happens to the compressor when there is an accumulation of contaminants?
• What causes burner can shift?
• What modification has been made to engines with very low ground clearance?
• What are the two methods used to remove an aircraft turbine engine?
• In a turbine engine overhaul, how do shop and field overhauls differ, and what factors influence choice?
• What is the advantage of using the abrasive grit process?
• Which description accurately reflects the method used to remove an engine?
• What is a key practice to manage tolerance stack-up during engine assembly?
• What type of main bearings are used in gas turbine engines?
• Burner can shift is caused by misalignment of which component?
• Stress rupture cracks are caused by what engine condition?
• Defects not detectable by dye-penetrant or magnetic particle methods can be found by using which method?
• In plasma spraying, the material is applied in what state?
• In a roller bearing, where do the rollers roll?
• What is the primary reason for covering engine openings during disassembly?
• How are non-metallic coatings evaluated for integrity in hot-section components?
• Which is the last stage of blade creep?
• What does NDT stand for and what is its general purpose in engine overhaul?
• In a continuously salt-laden atmosphere, what is the recommended frequency for a water wash?
• Which statement is NOT true about seals?
• What is the purpose of FOD inspection during overhaul and how is it conducted?
• Untwist of a turbine blade is caused by which condition?
• When extending torque measurement toward the handle, what must be done before applying torque?
• Which device verifies torque wrench calibration?
• What are the two categories of heavy maintenance?
• Which statement correctly describes the effect of compressor blade damage?
• Which two dye-penetrant inspection variants are described?
• Which statement best describes the cause of gas path erosion?
• Which NDT method is described as suitable for simple parts such as turbine and compressor blades?
• When blending a nicked blade, which direction is it accomplished in?
• Which maintenance category is typically performed with the engine installed in the aircraft?
• What factors contribute to achieving proper surge margin, and which inspection indicators relate to surge risk during an overhaul?
• Which of the following statements is true about micrometer torque wrenches?
• Untwist of a turbine blade is caused by?
• Which description best fits the correct approach to torqueing with lock tabs and maintaining alignment?
• What is meant by blending in turbine blade repair?
• Which type of torque wrench is used most often in maintenance tasks?
• Which term describes maintenance that allows removal and replacement of any part, zeroing the engine time?
• What procedure must be accomplished to prevent materials from entering the engine openings?
• If blade root slot wear is within limits, what is the recommended approach to restoration?
• What is the primary purpose of verifying turbine exhaust case integrity during overhaul?
• During overhaul, which parameter is commonly checked to verify journal bearing clearance is within spec?
• What is a key consideration for technicians when maintaining turbine engines?
• Which is the first stage of blade creep?
• What term describes the result of performing a solution wash to restore engine performance?
• What must be done with lock tabs during disassembly?
• How do you know that you reached the correct torque when using a micrometer torque wrench?
• How should a lock wire pigtail be formed?
• Which facility type performs Unlimited Maintenance according to the definitions?
• What angular spacing is used when replacing three blades as a set?
• What is the purpose of marking and identification during engine disassembly?
• What are the limitations of borescope inspection during overhaul?
• Which repair process is used to restore blade roots?
• Which of the following is not part of line maintenance?
• Describe line maintenance.
• What is the significance of compressor case integrity during an overhaul?
• Who publishes the specific procedures for an engine inspection?
• Explain the importance of tolerance stack-up in engine assembly during overhaul and how it affects performance.
• To keep the rotor in balance during blade blending, what do some manufacturers require?
• Describe Unlimited Maintenance?
• Which statement best describes the role of OEM-approved maintenance in the overhaul process?
• What is the operation principle of labyrinth seals?
• Define a shim operation and its context in overhaul.
• Which of the following is not a typical scope of line maintenance?
• After overhaul, how are engine diagnostics re-validated and what tests comprise acceptance?
• How are repaired areas identified after blending?
• During startup testing, why are thermal growth considerations important for clearances?
• Why is coating integrity critical in the combustor, and what is the consequence of coating damage?
• What prevents oil from leaking from the bearing chamber into the compressor or turbine gas path?
• What is the preferred method when torqueing bolts with lock tabs: bolt, nut, or both?
• What is the purpose of alignment checks during engine reassembly?
• Define blade tip clearance and explain its importance in overhaul acceptance criteria.
• What is the role of the transition piece in the combustor and what failure modes are checked during overhaul?
• When is sealing integrity verified during exhaust case checks?
• Which activities are included in the term maintenance?
• If there is an odd number of blades and there is no equal-weight moment blade available, how many blades can be replaced as a set?
• What is the primary purpose of using an extension with a torque wrench?
• What are typical fuel system components that are inspected or replaced during a turbine engine overhaul?
• Frequent water wash helps in what way?
• On the flight line, most of the damage to the compressor section comes from which source?
• What tool is used for the internal inspection of an engine?
• In turbine engine overhaul, what is the role of vibration analysis and how does it influence component replacement decisions?
• Which document provides the formula used to calculate corrected torque when the extension is toward the handle?
• What is the purpose of a shop test run during overhaul?
• Why must you adhere to established technical procedures?
• Which of the following is a cold-section repair method for an axial flow compressor?
• Describe how compressor and turbine blade height (airfoil) inspection is performed and common defects found.
• What is the role of the fuel control unit in a turbine engine overhaul and what checks are typically performed on it?
• NDT can prevent all fatigue-related failures in turbine engines.
• Explain the process of deciding between repairing or replacing a damaged turbine NGV.
• Which of the following is NOT listed as one of the most common NDT methods?
• Describe the purpose of a run-in test in the overhaul process and the key parameters to monitor.
• Which of the following are precautions when handling bearings?
• Which load is associated with aircraft attitude changes and gyroscopic effects of heavy rotating masses?
• Which statement best describes the role of test data in confirming post-overhaul performance?
• What is the term for vibration at the natural frequency?
• What is FADEC and what overhaul steps are performed on a FADEC system?
• How are turbine engine oil system issues diagnosed and what indicators would prompt component replacement?
• Which type of seal is characterized by non-contacting behavior using geometric steps to impede flow?
• List three common nondestructive testing methods used during turbine engine overhaul and what they detect.
• Describe the process for coating removal and restoration of hot-section components during overhaul.
• What is the consequence if blade tip clearance is out of tolerance after reassembly?
• If a torque wrench setting is 50 ft-lb, what is the equivalent in inch-lb?
• What are the advantages of electron beam welding in blade repair?
• What are typical acceptance limits for bearing clearances in a turbine engine overhaul and how are they measured?
• What is the purpose of cleaning and filtration in contamination control during overhaul?
• Which statement best describes the final certification after overhaul?
• Which is the middle stage of blade creep?
• Which components are repaired by plasma spray?
• Hot streaking is a condition that causes what outcome?
• What is the term for a vibration containing components at multiples of a base frequency?
• What are the three stages of blade creep?
• Which factor primarily determines the twists per inch when using safety wire?
• Can the borescope be used to inspect the entire internal portion of an engine?
• Contaminant buildup on the compressor blades results in what outcome?
• Which statement is correct regarding torque units?
• When addressing wear in blade root slots of a high-pressure turbine, what methods are used to restore the slots?
• What is N.D.T.?
• Describe unscheduled maintenance.
• What is borescope access and how does it influence overhaul scope and risk?
• Magnetic particle inspection is most effective in detecting what type of defects?
• For torqueing nuts and bolts that use lock tabs or castellated nuts, what is the general sequence?
• What are the two methods of performing compressor washes?
• What is the definition of torqueing?
• Which of the following is NOT listed as a type of bearing seal?
• During run-in tests, what condition indicates thermal stability?
• What type of maintenance is accomplished on the flight line?
• What must be checked before using a torque wrench?
• Which of the following best describes the function of lock wire in fastener assemblies?
• Which type of torque wrench is used most often?
• A water wash is also known as a
• Which statement correctly identifies a difference between labyrinth and carbon seals?
• 120 inch-pounds is equal to how many foot-pounds?
• What is the impact of improper exhaust case integrity on engine performance?
• Define engine N.D.T.
• What are the two most common methods of compressor cleaning?
• What is clearance sequencing in engine assembly and provide an example?
• Turbine blade creep is defined as?
• During disassembly, marking parts helps with what purpose?
• What is the most common cause of gas path erosion?
• Plasma coating repairs blade roots. Which part of the blade does this process primarily restore?
• How does an overheating event during service affect overhaul inspections and required actions?
• What is the consequence of coating delamination in hot-section components?
• Which NDT method is particularly suited to detect near-surface defects in ferrous materials?
• Why are some engines disassembled in a vertical position?
• What is the disadvantage of the abrasive grit process?
• Where would you find the code letter indicating the moment weight of the turbine blade?
• For overhaul maintenance, who publishes engine inspection procedures?
• Which of the following is a recommended practice to prevent F.O.D.?
• Which item is NOT among the five loads acting on main engine bearings?
• Describe the role of rotor balancing in the overhaul process and how completed assemblies are tested.
• Which safety practices are essential when performing turbine engine overhaul in a shop?
• What is the purpose of limiting the span between lock wires when routing them?
• What is used to verify a torque wrench calibration?
• In overhaul documentation, what is the role of non-destructive examination (NDT) reports?
• Which statement best describes the purpose of lock tabs or castellated nuts in a torque assembly?
• What does the bearing feel test involve?
• Which statement best captures the effect of the abrasive grit process?
• If the overhaul manual requires a torque of 600 inch-pounds and you have a foot-pound torque wrench, what will you set the torque wrench to?
• How many levels of maintenance are performed on gas turbine engines?
• Which components are commonly replaced if oil system issues are detected?
• What is the primary purpose of performing a borescope inspection during a turbine engine overhaul?
• The ingestion of contaminants affects which sections of the gas turbine engine?
• The moment weight of a rotor blade means?
• What is the advantage of using N.D.T. on turbine engines?
• What is a potential consequence of using a pencil to mark high-temperature alloy parts?
• Explain the differences among corrosion, erosion, and oxidation in turbine engines and how they are detected during overhaul.
• The motoring wash is carried out at what engine speed range?
• Hot spots seen on borescope inspection indicate malfunctions in which component group?
• Hot spots found during borescope inspection indicate malfunction in which system?
• How are nozzle guide vane tip clearances tested and how is clearance adjusted?
• The eddy current method is used to inspect what part or parts of the engine?
• What is the term for amplification when driving frequency matches a natural frequency?
• What is a 'hot section' inspection and what components are included?
• How does differential thermal expansion affect overhaul clearances during start-up compared to steady-state operation?
• During engine disassembly for overhaul, what is the purpose of marking components and recording reference points?
• What is the primary reason for torquing both the bolt and the nut when lock tabs are used?
• What is the primary difference in the effectiveness of wash methods?
• Which modification was implemented for engines with very low ground clearance?
• Which may be used to mark both cold and hot section parts?
• Which factors determine whether an accessory drive gearbox should be overhauled rather than replaced?
• During teardown, what criteria determine whether a turbine blade is unrepairable and must be replaced?
• Which method is used to accomplish cold-section repairs of an axial flow compressor?
• What is used to identify repaired areas after blending?
• Damage to the compressor blades results in what?
• Which statement best describes nondestructive testing in aviation?
• What is a critical speed in rotor dynamics, and how is it addressed during overhaul?
• Blade coating delamination is defined as the separation of protective coating from the substrate, and it is detected by:
• What is the most frequent defect found in the combustion section of a turbine engine?
• When the solution wash is performed, it is known as a
• Is the disassembly of an engine module considered to be a major or minor repair?
• What is the typical sequence for a shop overhaul from teardown to final acceptance?
• Which description best defines Limited Maintenance?
• To maintain rotor balance when blending, which action is sometimes required?
• Which of the following is NOT a main section of a non-modular turbine engine?
• List the five main sections of a non-modular turbine engine.
• Why is fuel nozzle and spray pattern inspection critical in overhaul and what defects are sought?
• The fir tree section of a turbine blade is associated with which feature?
• Briefly describe the plasma spray process.
• When performing multiple motoring compressor washes, what limitation must the technician observe?
• What is the function of turbine case cooling passages and what issues are checked during overhaul?
• Where are accelerometers used in vibration analysis during overhaul?
• What would cause bearings to become magnetized?
• Outline the significance of journal bearings in the oil system and how wear is assessed during overhaul.
• Which contamination sources during overhaul and how are they controlled?
• The fluid wash method also helps to clean which other engine component?
• When an extension is installed toward the handle, which statement correctly describes how to determine the applied torque?
• Which inspection method is most effective for inspecting denser metallic and non-metallic materials?
• Which method is used to contour damaged blades and vanes?
• What is a typical action if a blade is found to have coating delamination during inspection?
• Which practice helps ensure lock wire remains secure around fasteners?
• What evidence is typically required to certify an overhaul as airworthy?
• Describe heavy maintenance.
• Which statement best distinguishes labyrinth seals from carbon seals?
• What is the recommended practice for securing fasteners with lock tabs after torquing?
• Which statement correctly describes the relationship between foot-pounds and inch-pounds?
• A torque setting of 120 foot-pounds is equal to ______ inch pounds.
• What effect do oil contaminants have on turbine engine life, and what maintenance actions mitigate the risk during an overhaul?
• Which load arises from compression and tension between stationary cases and the rotor system due to thermal expansion?
• Which combination of tools is commonly used to verify rotor alignment during reassembly?
• Why are blade root and dovetail geometry critical in overhauls, and what inspection methods ensure compatibility?
• Describe two methods used for dye-penetrant inspections?
• Which documentation is typically required to close an overhaul work order?
• Which wash method cleans turbine vanes and blades more effectively?
• What other repairs are accomplished using plasma spraying?
• In routine maintenance, who publishes engine inspection procedures?
• What are designers doing to minimize the gas path erosion problem?
• What does F.O.D. stand for?
• How is a bowed turbine vane inspected and repaired if possible?
• What action is taken if hot-section inspection reveals thermal damage after an overheating event?
• Designers minimize ingestion of contaminants by what approach related to slip-streams?
• How can you determine that the correct torque is applied when using a micrometer torque wrench?
• Which tools are included in the tools needed to blend a damaged blade?
• In terms of FAA categories, line maintenance is considered what?