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General
Ground Operation and Servicing
| Question | Answer |
|---|---|
| What is the procedure for extinguishing an induction system fire that occurs during starting of a reciprocating aircraft engine? | Continue cranking the engine to try and suck the fire out. If cranking the engine does not work, then extinguish the fire using CO2. |
| What is the purpose of pulling a propeller through by hand for two or three revolutions prior to starting a radial or inverted engine? | To detect hydraulic lock. Any liquid present in the cylinder will be indicated by abnormal effort required to rotate the propeller, or by the propeller stopping abruptly during rotation. |
| What damage is most likely to occur if excessive force is exerted on the crankshaft when there is liquid lock? | The force can bend or break a connecting rod or permanently damage the cylinder. |
| What information must be located on or near fuel filler openings and oil filler openings? | For fuel filler openings, the word "fuel" and the minimum fuel grade or designation for the engine. Oil filler openings require the word "oil" to be marked at or near the filler cap. |
| Why must aircraft and fuel trucks be grounded together with a grounding cable? | To eliminate the buildup of static electricity that could result in explosion |
| Describe the system used to designate performance rating of aviation gasoline. | For fuels below grade 100, octane numbers are used. For fuels above grade 100, the numbers represent the performance rating of the fuel compared to 100 percent iso—octane. |
| What would be the result of operating an aircraft reciprocating engine using a lower grade of avgas (aviation gasoline) than that specified for the engine? | There would be a loss of engine power, efficiency, and possible detonation |
| What color is low lead 100 dyed? | Blue. |
| What are the functions of tetraethyl lead in avgas? | To lubricate and reduce detonation. |
| Why should an aviation mechanic know the meaning of the standard light signals which are used by control tower operations? | If radio communication is not possible, the light signals may be used for taxi control when an aircraft must be taxied to another part of the airport |
| What type of knot is typically used when securing an aircraft outdoors with a rope? | A bowline knot. |
| Which publication lists the standard FAA hand signals a taxi signalman should use? | The FAA Airman's Information Manual |
| What is the result of mixing aviation gasoline with jet fuel in a turbine engine? | When aviation gasoline is mixed with jet fuel, the tetraethyl lead in the gasoline will form deposits on the turbine blades and vanes. Continued use of mixed fuel may cause a loss in engine efficiency. |
| What may result if aviation gasoline that is contaminated with jet fuel is used in a reciprocating engine? | Gasoline which is contaminated with jet fuel is unsafe for use in a reciprocating engine and will result in complete engine failure. |
| When towing a large aircraft with a tow tractor, what brakes should be used to stop the aircraft? | When towing an aircraft, always apply the tractor brakes for slowing and stopping. |
| What are the safety requirements when starting and running a powerplant? | Use the correct checklist, position the aircraft into the wind, check the prop blast area, secure the external power cart and use a fireguard. |
| What are safety precautions when operating a drill press? | Wear eye and ear protection, clamp the workpiece securely, adjust for the proper RPM, stop machine completely before adjusting workpiece and clean the area when finished. |
| Why is a tire cage recommended when inflating aircraft tires? | To prevent possible personal injury should the tire or wheel fail. |
| What type of fire can a CO2 extinguisher be used on? | Class A, B, and C type fires. |
Created by:
llanesjc29