General oral AKTR questions

What is the basic unit of capacitance?

The Farad

what is the purpose/function of a capacitor?

to store electricity

Why should electrolytic capacitors not be used in an AC circuit?

They are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity.

What is impendance?

Impendence is the opposition of current flow in an AC circuit from the combination of resistance, inductive resistance, and capacitive reactance

What units is impendance measured?

In Ohms

How much current flows through through each of three resistors connected in parallel if the total current is 3 amps?

1 Amp

Which has the more critical center of gravity range, an airplane or a helicopter?

A helicopter

Where is the center of gravity for most airplanes located in relation to the center of lift?

The CG is normally ahead of the center of lift.

How do you find the moment of an item installed in an aircraft?

Multiply the weight of the item in pounds by its distance from the datum in inches.

Where do you find the arm of an item installed in an aircraft?

In the TCDS or the Aircraft Equipment List.

What publication lists the standard hand signals used for directing a taxing aircraft?

FAA aeronautical information manual and aviation Maintenance tech Handbook - General (FAA-H-8083-30)

What action should a mechanic take while taxiing an aircraft on a runway if the tower shines a flashing red light at him?

Taxi the Aircraft clear of the runway in use.

When starting an aircraft engine equipped with a float carburetor, in what position should the carburetor heat control be placed?

In the Cold position

What is the procedure if a Hung Start occurs when starting a TurboJet Engine?

Terminate the starting operation and find the reason the engine would not accelerate as it should.

How far ahead of an idling turbojet engine does the danger area extend?

25 Feet

What is meant by liquid lock in the cylinder of an aircraft engine, and how is it cleared?

Oil collects in the cylinders below the engine's centerline, preventing the piston from reaching full stroke. To clear a liquid lock, remove a spark plug and crank the engine to expel the oil.

What are the control tower light signals that may be used when taxiing or towing an aircraft, and what are their meanings?

Flashing red - taxi clear of runway in use

Flashing Green - Cleared to taxi.

Steady Red - Stop.

Flashing White - Return to starting point

Red and Green flashing - Exercise extreme caution

What is meant by detonation in an aircraft reciprocating engine?

Detonation is an uncontrolled burning of the fuel in the cylinder of an engine. It is an explosion rather than a smooth burning.

Why is it important that turbine fuel not be mixed with AV GAS used in an aircraft reciprocating engine?

The turbine engine fuel will cause the engine to detonate severely.

What is the danger of using fuel that vaporizes too readily?

Vapor lock can occur in the fuel lines. This will shut off the flow of fuel to the engine.

What causes corrosion?

Corrosion happens when a metal reacts chemically with its surroundings, usually air or water, leading to its deterioration. This reaction, often oxidation, causes the metal to lose electrons, forming an oxide layer and weakening the metal structure

What causes fisheyes in the finish?

Localized surface contamination.

What is 50 gallons converted to liters?

189.3 liters.

What is 25 kilos converted to pounds? (AM.I.H.K7)

55 pounds

What determines if an alteration or repair is considered major?

The lists of the types of repairs and alterations that are considered major are listed in the 14 CFR Part 43, Appendix A

What determines if an alteration or repair is considered minor?

It is considered minor if it is not listed in 14 CFR part 43, Appendix A, as a major repair or Alteration

if an individual develops a different process for complying with an AD, are they allowed to use that process?

They are not allowed to deviate from the AD unless they submit the process to the administrator as an alternative method of compliance (AMOC), and the AMOC is approved.

Where does an aircraft manufacturer specify the compliance requirements for methods, Techniques, and practices?

In the Maintenance Manual and instructions for Continued Airworthiness.

What formula is used to find the amount of work done to an object is moved across a floor?

Work = Force x Distance

What determines the mechanical advantage of an arrangement of ropes and pulleys?

The number of ropes that support the weight.

What determines the mechanical Advantage of a gear train?

The ratio between the number of teeth on the drive gear and the number of teeth on the driven gear.

What is the proper type of nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging?

Fluorescent or visual dye penetrant.

What is the principle upon which ultrasonic inspection is based?

Any fault within a material will change the materials resonant frequency. Comparing the resonant frequency of a known sound material with the material under test will indicate the presence of a fault.

What is the procedure when making a dye penetrant inspection of a part?

Clean the part thoroughly, apply the penetrant, allow it to soak for the recommended dwell time. Remove all of the penetrant form the surface and apply the developer.

When computing weight and balance, what is the "moment" and how is it obtained?

Moment is a force which tends to rotate the aircraft about one of its axes. it is obtained by multiplying the weight of an item (pounds) by the distance of an item from the datum (inches). Expressed using the W X A = M