Ground Ops Oral

Question 1

What is the proper way to extinguish an induction system fire that occurs when starting a reciprocating engine?

Answer 1

Keep the engine running and blow the fire out. If this does not work, use a CO2 fire extinguisher directed into the carburetor air inlet.

Question 2

What type of fire extinguisher is best suited for extinguishing an induction fire in a reciprocating engine?

Answer 2

Carbon Dioxide

Question 3

What must be done if a hung start occurs when starting a turbojet engine?

Answer 3

Terminate the starting operation and troubleshoot the reason for the engine not starting

Question 4

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

Answer 4

Oil accumulation in the cylinders below the center line prevents piston movement to the top of its stroke. Remove a spark plug and turn the crankshaft until all oil is out of the cylinder.

Question 5

What special precautions should be taken when towing an aircraft that is equipped with a steerable nose wheel?

Answer 5

Be sure the nosewheel does not try to turn past its stops. Disconnect the torsion links on the nose wheel strut when towing.

Question 6

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

Answer 6

In the Cold/Off position

Question 7

How far ahead of an idling turbojet engine does the danger area of extend? Behind, Takeoff power settings?

Answer 7

25 feet, 100 feet, 200 feet.

Question 7

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

Answer 7

The turbine engine fuel will cause the engine to detonate

Question 8

What grade of aviation gasoline is dyed blue?

Answer 8

Low-Lead 100-Octane

Question 9

What damage is likely to occur if an aircraft reciprocating engine that is designed to use 100-octane fuel operated with 80-octane?

Answer 9

Detonation will occur, damaging connecting rods, burning pistons, and cracking cylinder heads.

Question 10

What is meant by detonation in an aircraft reciprocating engine?

Answer 10

An uncontrolled burning of the fuel in the cylinder of an engine. An explosion rather than a smooth burning.

Question 11

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

Answer 11

Vapor lock can occur in the fuel lines, shutting off flow of fuel to the engine.

Question 12

What type of fuel is in Jet-A fuel?

Answer 12

Jet Engine Fuel

Question 13

What is the significance of the two numbers, 100/130, in the dual rating of aviation gasoline?

Answer 13

Octane rating
First Number: Lean Mixture
Second Number: Rich Mixture

Question 14

What are two functions of tetraethyl lead that is added to AVGAS?

Answer 14

Increases critical pressure and temperature of the fuel, acts as a lubricant for the valves.

Question 15

What information must be located near the fuel tank filler opening in an aircraft powered by a reciprocating engine?

Answer 15

The word “Avgas”, and the minimum fuel grade.

Question 16

What information must be located near the fuel tank filler opening in an aircraft powered by a turbine engine?

Answer 16

The words “Jet Fuel”, permissible fuel designations, references to the AFM. For Pressure fueling systems, maximum permissible fueling supply pressure and maximum permissible defueling pressure.

Question 17

What action should a mechanic take while taxiing an aircraft on a runway the tower shines a flashing red light? Steady red? Flashing Green?

Answer 17

Taxi the aircraft clear of the runway, Stop, Cleared to Taxi

Question 18

What publication lists the standard hand signals that are used for directing a taxiing aircraft?

Answer 18

ASA-AMT-G, General Textbook Chapter 1

Question 19

What should be done to a reciprocating engine fuel system if turbine fuel is inadvertently put into the tanks and the engine is run?

Answer 19

Entire fuel system drained and flushed with gasoline, engine given a compression check, oil drained and filters checked. Engine must be given a proper run-up and check.