NAVY AVIATION MACHINIST FINAL PAPER QUESTIONS
AND ANSWERS 2025/2026 ALL RATED A+
✔✔Pressure Relief Valve - ✔✔Relieves excess system pressure
✔✔Selector Valve - ✔✔Directs the flow of fluid
✔✔Actuating Unit - ✔✔converts fluid pressure to useful work (mechanical motion)
✔✔Tubing - ✔✔Transports the fluid throughout the system
✔✔Check Valve - ✔✔A valve that allows flow in one direction only
✔✔2 types of contamination - ✔✔Abrasive and Non-abrasive
✔✔Greatest maintenance hazard for hydraulics - ✔✔Contamination
✔✔Origins of contamination - ✔✔1. Particles originally contained in the system
2. Particles introduced from outside the system
3. created within the system during operation
4. Introduced by foreign liquid
✔✔Contamination Control - ✔✔1. Ensure filters are maintained according to instruction
2. Hold contamination to a minimal during maintenance
✔✔SAFETY- Hydromechanical Systems - ✔✔1. Hydromechanical systems operate at
extremely high pressure (3,000 psi)
2. A pin-hole leak at these pressures can force the fluid through your skin
3. Never attempt to repair system leaks with the system under pressure.
✔✔Power - ✔✔The rate of doing work or the rate of expanding energy
✔✔Motion - ✔✔The act or process of changing place or position
✔✔Velocity - ✔✔Rate of change of distance with the respect to time in a given direction
✔✔Acceleration - ✔✔Rate if change of velocity
✔✔Energy - ✔✔Ability to do work or bring about changes in matter
✔✔Intertia - ✔✔the property of a body to resist changes to its state of rest or motion
✔✔jet propulsion - ✔✔Propelling force generated in the direction opposite to the flow of
gas under pressure which is escaping through an opening called a jet nozzle
, ✔✔Standard Day - ✔✔59 degrees Fahrenheit with a barometric pressure of 29.92
inches of mercury. (14.7 psi) 0 humidity and 0 wind velocity
✔✔The Brayton Cycle - ✔✔Name given to the thermodynamic cycle of a gas turbine
engine to produce thrust.
✔✔What are the 4 continuous and constant events in the Brayton Cycle - ✔✔Intake,
Compression, Combustion and Exhaust
✔✔Thrust Classification - ✔✔Static and Net Thrust
✔✔Static Thrust - ✔✔Thrust produced when the aircraft or engine has no forward
motion
✔✔Net thrust - ✔✔Thrust available to power the aircraft in flight
✔✔Variables Affecting Thrust - ✔✔Revolutions Per Minute (RPM)
Humidity
Outside Air Temperature (OAT)
Barometric Pressure
✔✔Front Frame Section - ✔✔Location: Mounted on the front of the compressor
Description: Welded steel ring that houses the inlet guide vans (IGVS)
Purpose: Recieve air from the air inlet duct and pre-swirl the air (IGVS do this) in the
direction of rotation of the engine compressor rotor to prevent shock.
✔✔5 Components of the Compressor - ✔✔Casing, Rotor Assembly, Stator Assembly,
Exit Guide Vanes and the Diffuser
✔✔Compressor Section - ✔✔Location: Between the Front Frame and the Combustion
section
Purpose: To supply compressed air in sufficient quantities to satisfy the requirements of
the combustion section
✔✔Compressor Casing - ✔✔Outer housing for the compressor. Stator Assembly
mounted to this.
✔✔Compressor rotor assembly - ✔✔Compressor blades that accelerate the air
rearward. Attached by fir tree roots, dovetail or bulb. Locked in by peening, pins, lock
wire or keys. Assembly also include the compressor disk and compressor shaft.
AND ANSWERS 2025/2026 ALL RATED A+
✔✔Pressure Relief Valve - ✔✔Relieves excess system pressure
✔✔Selector Valve - ✔✔Directs the flow of fluid
✔✔Actuating Unit - ✔✔converts fluid pressure to useful work (mechanical motion)
✔✔Tubing - ✔✔Transports the fluid throughout the system
✔✔Check Valve - ✔✔A valve that allows flow in one direction only
✔✔2 types of contamination - ✔✔Abrasive and Non-abrasive
✔✔Greatest maintenance hazard for hydraulics - ✔✔Contamination
✔✔Origins of contamination - ✔✔1. Particles originally contained in the system
2. Particles introduced from outside the system
3. created within the system during operation
4. Introduced by foreign liquid
✔✔Contamination Control - ✔✔1. Ensure filters are maintained according to instruction
2. Hold contamination to a minimal during maintenance
✔✔SAFETY- Hydromechanical Systems - ✔✔1. Hydromechanical systems operate at
extremely high pressure (3,000 psi)
2. A pin-hole leak at these pressures can force the fluid through your skin
3. Never attempt to repair system leaks with the system under pressure.
✔✔Power - ✔✔The rate of doing work or the rate of expanding energy
✔✔Motion - ✔✔The act or process of changing place or position
✔✔Velocity - ✔✔Rate of change of distance with the respect to time in a given direction
✔✔Acceleration - ✔✔Rate if change of velocity
✔✔Energy - ✔✔Ability to do work or bring about changes in matter
✔✔Intertia - ✔✔the property of a body to resist changes to its state of rest or motion
✔✔jet propulsion - ✔✔Propelling force generated in the direction opposite to the flow of
gas under pressure which is escaping through an opening called a jet nozzle
, ✔✔Standard Day - ✔✔59 degrees Fahrenheit with a barometric pressure of 29.92
inches of mercury. (14.7 psi) 0 humidity and 0 wind velocity
✔✔The Brayton Cycle - ✔✔Name given to the thermodynamic cycle of a gas turbine
engine to produce thrust.
✔✔What are the 4 continuous and constant events in the Brayton Cycle - ✔✔Intake,
Compression, Combustion and Exhaust
✔✔Thrust Classification - ✔✔Static and Net Thrust
✔✔Static Thrust - ✔✔Thrust produced when the aircraft or engine has no forward
motion
✔✔Net thrust - ✔✔Thrust available to power the aircraft in flight
✔✔Variables Affecting Thrust - ✔✔Revolutions Per Minute (RPM)
Humidity
Outside Air Temperature (OAT)
Barometric Pressure
✔✔Front Frame Section - ✔✔Location: Mounted on the front of the compressor
Description: Welded steel ring that houses the inlet guide vans (IGVS)
Purpose: Recieve air from the air inlet duct and pre-swirl the air (IGVS do this) in the
direction of rotation of the engine compressor rotor to prevent shock.
✔✔5 Components of the Compressor - ✔✔Casing, Rotor Assembly, Stator Assembly,
Exit Guide Vanes and the Diffuser
✔✔Compressor Section - ✔✔Location: Between the Front Frame and the Combustion
section
Purpose: To supply compressed air in sufficient quantities to satisfy the requirements of
the combustion section
✔✔Compressor Casing - ✔✔Outer housing for the compressor. Stator Assembly
mounted to this.
✔✔Compressor rotor assembly - ✔✔Compressor blades that accelerate the air
rearward. Attached by fir tree roots, dovetail or bulb. Locked in by peening, pins, lock
wire or keys. Assembly also include the compressor disk and compressor shaft.
