Jeppesen A&p General Some Typical Oral Questions

Front 1

What is a British Thermal Unit?

Back 1

The amount of heat energy required to change the temperature of 1 pound of water 1 degree Fahrenheit.

Front 2

What is the approximate speed of sound at sea level on a standard day?

Back 2

661 Knots or 340 meters per second.

Front 3

What is the atmospheric pressure at sea level on a standard day?

Back 3

29.92 inches of Mercury or 1013.2 millibars.

Front 4

On a standard day at sea level, what is the value for temperature

Back 4

59 F or 15 C.

Front 5

What are the factors that cause an airplane wing to stall?

Back 5

Stall is caused when the angle of attack exceeds a critical value and the airflow separates from the upper surface and becomes turbulent.

Front 6

What are the principal effects that result from lowering the flaps while in flight?

Back 6

Lift increases, drag decreases and stall speed decreases.

Front 7

What is the function of a wing mounted vortex generator?

Back 7

Vortex generators delay or keep the airflow from separating from the upper surface of a wing during high speed flight.

Front 8

How does blade-flapping help to compensate for dissymmetry or lift in helicopter main rotor system?

Back 8

Flapping increases the angle of attack and lift on the retreading blade and decreases the angle of attack and lift on the advancing blade.

Front 9

How does the airflow through the main rotor of a helicopter change during the transition from normal flight to autorotation?

Back 9

During normal flight the air moves downward and during autorotation the air moves upward.

Front 10

What is friction?

Back 10

The opposition to relative motion between two objects in contact with each other.

Front 11

What are the three causes of opposition to current flow in an AC circuit?

Back 11

Resistance, inductive reactance and capacitive reactance.

Front 12

Define inductance.

Back 12

An induced voltage which is opposite in direction to the applied voltage.

Front 13

How does a capacitor store electricity?

Back 13

The energy is stored in the form of an electrostatic charge or field that exists between two conductors separated by an insulator.

Front 14

What is the difference between an "allowance" and a "tolerance"?

Back 14

An allowance is the difference between the nominal dimensions and the maximum and minimum permissible sizes. The tolerance is the difference between the extreme permissible dimensions, which may be found by adding the plus and minus allowances.

Front 15

What is the purpose of an aircraft loaded graph?

Back 15

It is a method for determining how to distribute the load so as to keep the C.G. within allowances limits.

Front 16

How do you work harden a piece of metal?

Back 16

By cold working the metal.

Front 17

Describe the primary difference between a thermosetting and a thermoplastic resin.

Back 17

A thermosetting resin doesn't soften when heat and chars or burns rather than melting. Thermoplastic resins become soft and pliable when heated, and harden when cooled.

Front 18

Explain how thermoplastic and thermosetting resins are commonly used in modern aircraft.

Back 18

Plexiglas is a thermoplastic resin commonly used for windshields and windows. Thermosetting resins are most often used as the matrix material in composite structures.

Front 19

Name one of the types of resin commonly used as the reinforcing component in a composite structure?

Back 19

Fiberglass, Aramid (Kevlar), Graphite (Carbon) fiber, linen and paper.

Front 20

What are the reasons that alloy steel that is responsive to heat treatment is usually less suitable for welding?

Back 20

It may become brittle and lose its ductility in the area of the weld.

Front 21

Give one advantage of pre-preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components.

Back 21

(1) Pre-preg fabrics contain the correct amount of matrix. (2) The matrix material evenly and completely permeates the reinforcing fibers. (3) The matrix has the resin and hardener in the correct proportions.

Front 22

What is the difference between a close tolerance bolt and a general purpose bolt?

Back 22

Close tolerance bolts are machined to more accurate dimensions.

Front 23

When installing stainless steel tubing, what type of fittings should be used?

Back 23

Stainless steel fittings.

Front 24

What are the names of the parts of a flareless tube fitting?

Back 24

The nut and the ferrule or sleeve.

Front 25

How do you tell a flareless fitting from a flare-type fitting?

Back 25

Flareless fittings don't have a flare cone and there is no space between the threads and the end of the fitting.

Front 26

What are some of the important advantages of Teflon tubing?

Back 26

It is compatible with nearly every liquid, has a broad operating temperature range, low resistance to fluid flow and has a very long shelf and service life.

Front 27

Describe the identification markings commonly found on flexible hoses.

Back 27

A lay line, identification such as a Mil Spec number, the manufacturer's name or symbol, the hose size and a date code.

Front 28

Describe the operation of quick disconnect couplings.

Back 28

Each half has a valve that is held open when coupled and is spring-loaded closed when disconnected.

Front 29

A correctly made butt weld will have that bead width and how much penetration?

Back 29

The bead width should be 3 to 5 times the thickness of the base metal and there must be 100% penetration.

Front 30

What telltale characteristics are evidence of a cold weld?

Back 30

A cold weld has a rough, irregular edges that are not feathered into the base metal and has variations in penetration amounts.

Front 31

The penetration of a fillet weld should be what percentage of the thickness of the base metal?

Back 31

25 to 50 percent.

Front 32

Give at least three examples of the factors that cause or influence corrosion.

Back 32

(1) The environmental conditions. (2) The presence of dissimilar metals. (3) The type of metal. (4) The presence of electrolytes and/or contaminants. (5) the condition of protective coatings.

Front 33

What are the two primary factors that may cause development of stress corrosion cracks?

Back 33

A corrosive environment and sustained tensile stress.

Front 34

What are the visible signs of fretting corrosion?

Back 34

The corrosion residue has a dark, smoky appearance and often appears around and steaming back from rivet heads.

Front 35

What is meant by the term "Hot Start" when starting a jet engine?

Back 35

Ignition occurs with an excessively rich mixture, leading to a rapid temperature rise that can exceed the exhaust gas temperature unit.

Front 36

What are the indications of water in aircraft fuel after draining a sample from the fuel sumps?

Back 36

The sample may have a cloudy or hazy appearance or a solid slug of water.

Front 37

What federal aviation regulation prescribes the requirements for issuance of a type certificate?

Back 37

FAR (14 CFR) Part 21

Front 38

What part of the FARs describes the airworthiness standards for Transport Category airplanes?

Back 38

FAR Part 25

Front 39

What part of the FARs describes the performance characteristics that a small aircraft must demonstrate in order to be airworthy?

Back 39

FAR Part 23

Front 40

What publication might you consult for guidance when maintaining an old aircraft for which no maintenance manual exists?

Back 40

AC 43.13-1B or its latest version.

Front 41

How often is the summary of ADs published?

Back 41

Every two years.

Front 42

How are AD updates issued to subscribers to the Summary or Airworthiness Directives?

Back 42

Through biweekly supplements.

Front 43

In what publication may a mechanic find an example of a maintenance record entry for a 100-hour inspection?

Back 43

FAR Part 43.11

Front 44

What items must be entered into the aircraft records after maintenance is performed?

Back 44

(1) A description of the work performed and/or reference to acceptable data. (2) The date the work was completed. (3) The signature, certificate number and type of certificate of the person approving the aircraft for return to service.

Front 45

What regulation authorizes a certificated mechanic who holds an Inspection Authorization to approve or disapprove a major repair or alteration?

Back 45

FAR 65.95

Front 46

Are there any circumstances when more than two copies of Form 337 are required, and if so, when?

Back 46

Yes. Three copies are required when a fuel tank is installed in the passenger or baggage compartment. The third copy must be kept aboard the aircraft.

Front 47

When performing an inspection required by FAR Part 91, what rotorcraft systems must be inspected in accordance with the manufacturer's maintenance manual or instructions for continued airworthiness?

Back 47

The drive shafts or similar systems. The main rotor transmission gearbox for obvious defects. The main rotor and center section. The auxiliary rotor on helicopters.

Front 48

How can you determine that an aircraft part or appliance you receive is serviceable?

Back 48

By an approval for return to service in the maintenance record for the part or appliance. With a completed Form 337.

Front 49

Is a person with a private pilot's certificate allowed to perform maintenance and, if so, what are his/her limitations?

Back 49

A pilot may perform preventive maintenance in accordance with FAR Part 43.3, 43.7 and Appendix A on an airplane owned by the pilot. He or she can also approve the aircraft for return to service following that maintenance