Electrical
This component uses electromagnetic force to remotely control a high-current switch via a low-current circuit.
What is a solenoid (or relay)?
This chemical agent is commonly used in vapor-cycle air conditioning systems to absorb heat from the cabin.
What is Refrigerant (e.g., R-12 or R-134a)?
This type of visual corrosion looks like a white, powdery deposit on aluminum alloys.
What is pitting corrosion (or oxidation)?
This type of hydraulic fluid, characterized by its purple color, is fire-resistant but highly corrosive to paints.
What is Skydrol (phosphate ester fluid)?
This flight control surface controls an aircraft's movement around its longitudinal axis.
What are ailerons?
This is the specific type of electrical diagram that shows the physical location of components and routing of wires.
What is a wiring diagram (or installation diagram)?
This component in a cabin pressurization system directly regulates cabin pressure by venting excess air overboard.
What is an outflow valve?
This specific tool is used to mechanical drill out the head of a damaged rivet without expanding the rivet hole.
What is a rivet removal tool (or center punch/drill)?
This hydraulic component stores fluid under pressure to supplement the pump and cushion pressure surges.
What is an accumulator?
This primary control surface is used to pitch the nose of the aircraft up or down.
What is the elevator?
This structural protection device is installed to prevent a path of high current from damaging a continuous wire run.
What is a circuit breaker (or fuse)?
This specific hazard must be rigorously monitored when using combustion heaters to warm an aircraft cabin.
What is carbon monoxide poisoning?
To prevent a crack from spreading in a sheet metal skin, a mechanic must perform this specific circular procedure.
What is stop-drilling?
This specific mechanical device allows fluid to flow in only one direction within a system.
What is a check valve?
This device is installed on a control surface to help reduce the physical force a pilot needs to move the controls.
What is a trim tab (or balance tab / servo tab)?
This is the maximum percentage of voltage drop allowed in an aircraft electrical wire run carrying continuous current.
What is 2 percent?
This device regulates the maximum differential pressure to prevent structural damage to a pressurized cabin.
What is a cabin pressure safety valve (or dump valve)?
This term describes the minimum distance from the edge of a sheet metal piece to the center of the first rivet hole.
What is edge distance (typically 2D)?
This type of hydraulic seal is directional and must face the direction of the fluid pressure to seal properly.
What is a U-ring (or V-ring / chevron seal)?
This specialized tool is used by a mechanic to measure the exact amount of tension on a flight control cable.
What is a tensiometer?
This electrical troubleshooting instrument must never be connected to an active, energized circuit.
What is an ohmmeter?
This source of air is tapped directly from the compressor section of a turbine engine to pressurize the cabin.
What is bleed air?
This mechanical process relieves internal stresses in aluminum sheet metal by heating it and cooling it slowly.
What is annealing?
This device automatically cuts off pump delivery to the system when the desired system pressure is reached.
What is a pressure regulator (or unloading valve)?
This is the aerodynamic phenomenon where a control surface vibrates violently due to improper cable tension or imbalance.
What is control surface flutter?