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General

GROUND OPERATION AND SERVICING

QuestionAnswer
What is the proper way to extinguish an induction system fire that occurs when starting a reciprocating engine? 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.
What type of fire extinguisher is best suited for extinguishing an induction fire in a reciprocating engine? Carbon dioxide.
What must be done 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.
What is meant by a liquid lock in the cylinder of an aircraft engine, and how is one cleared? Oil accumulates in the cylinders below the center line of the engine and prevents the piston moving to the top of its stroke.
What special precautions should be taken when towing an aircraft that is equipped with a steerable nose wheel? Be sure that the nose wheel does not try to turn past its stops. Some aircraft must have the torsion links on the nose wheel strut disconnected when they are being towed.
When starting an aircraft engine that is equipped with a float carburetor, in what position should the carburetor heat control be placed? In the "Cold" position.
How far ahead of an idling turbojet engine does the danger area extend? 25 feet.
Why is it important that turbine fuel not be mixed with aviation gasoline that is used in an aircraft reciprocating engine? The turbine engine fuel will cause the engine to detonate.
What grade of aviation gasoline is dyed blue? Low-lead 100-octane.
What damage is likely to occur if an aircraft reciprocating engine that is designed to use 100-octane fuel is operated with 80-octane fuel? Detonation will occur, which will cause such things as bent connecting rods, burned pistons and cracked cylinder heads.
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.
What is the danger of using a 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 type of fuel is Jet-A fuel? A fuel with a heavy kerosine base, a flash point of 110 through 150°F, a freezing point of -40°F, and a heat energy content of 18,600 Btu/pound.
What is the significance of the two numbers, 100/130, in the dual rating of aviation gasoline? The first number is the octane rating or performance number of the fuel when operating with a lean mixture, and the last number is the octane rating or performance number when operating with a rich mixture.
What are two functions of tetraethyl lead that is added to aviation gasoline? It increases the critical pressure and temperature of the fuel, and it acts as a lubricant for the valves.
What information must be located near the fuel tank filler opening in an aircraft powered by a reciprocating engine? The word "Avgas," and the minimum fuel grade.
What information must be located near the fuel tank filler opening in an aircraft powered by a turbine engine? The words "Jet Fuel," the permissible fuel designations, or references to (AFM) for permissible fuel designations. For pressure fueling systems, the maximum permissible fueling supply pressure and the maximum permissible defueling pressure.
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.
What publication lists the standard hand signals that are used for directing a taxiing aircraft? ASA-AMT-G, General textbook, page 629.
What should be done to a reciprocating engine fuel system if turbine fuel is inadvertently put into the tanks and the engine is run? Entire fuel system must be drained and flushed with gasoline, given a compression check and all of the cylinders given a borescope inspection. The oil drained, all of the filters & strainers checked. Properly fueled, proper run-up and check.
Created by: Aima2019