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ORAL General Ground Operation and Servicing
Terms in this set (22)
What is the procedure for extinguishing reciprocating engine induction system fires that occur during starting?
Continue cranking the engine to draw in the fire while starting procedures are maintained. If the engine does not start and the fire continues to burn, discontinue starting and have the fireguard extinguish the fire.
What are the results of using aviation gas that has been contaminated with jet fuel in a reciprocating engine?
Aviation gasoline contaminated with turbine fuel is unsafe for use in reciprocating engines and could cause engine damage or failure.
What information must be located adjacent to fuel and oil filler openings?
The fuel filler openings are clearly marked with the word "FUEL", the tank capacity, and the type of fuel. The oil tank filler openings are clearly marked with the word "OIL" and capacity.
Describe the system used by aircraft fuel suppliers to designate performance rating of aviation gasoline.
Aviation fuel (gasoline) has two scales to designate fuel grade. Example: 91/96 or 100/130. The lower number designates the lean mixture rating and the higher number designates the rich mixture rating.
What procedure should be followed before starting a reciprocating engine to detect liquid locking of the cylinders?
Pull the engine through three or four complete revolution by hand to detect a hydraulic lock. Never use force when a liquid lock is detected.
What damage is most likely to result from liquid lock?
Sufficient force can be exerted on the crankshaft to bend or break a connecting rod.
What methods should be used to aid reciprocating engine starts in cold weather?
Use of pre-heat and oil dilution as needed and proper mixture and priming procedures recommended by the aircraft manufacturer for the engine/carburetor combination.
How do you determine the presence of water in aircraft fuel when draining fuel sumps?
Using a clear, clean container, the water will appear as droplets on the bottom of the container.
May automotive gasoline be used in an aircraft engine?
Only if FAA approved (such as an STC). The type of certificate data sheet should be checked for limitations.
What is meant by the term "HOT START" when starting an aircraft turbojet (turbine) engine?
When the engine starts and the engine operating temperature (EGT) exceeds specified limits.
When and why is pre-oiling of a reciprocating engine necessary?
Before starting a new engine or an engine that has been preserved for storage. To provide adequate lubrication on initial start.
When refueling an aircraft, what precautions should be taken?
Use of correct fuel; proper grounding of aircraft and refueling unit; protection of aircraft surface from hose or nozzle damage and fuel spillage hazard.
Where are aircraft taxi hand signals published?
Aeronautical (Airman's) Information Manual.
Why should aviation mechanics know standard light signals?
Standard light signals may be used for taxi control when taxiing aircraft.
When towing an aircraft with a tow-tractor, what brakes are used when the aircraft is to be stopped?
The tow-tractor brakes. The aircraft brakes should be used ONLY if necessary in emergency conditions.
What type of knots should be used when using rope to secure light aircraft?
Anit-slip knots such as the bowline.
What are the starting safety procedures when hand propping a small engine?
Fuel on, switch off, throttle closed, and brakes on. Contact is called and the switch is placed "ON". Be sure the ground is firm and do not lean into propeller arc.
What are the physical and safety requirements for starting and running a powerplant?
Use proper starting checklist, position aircraft into the wind, check prop blast area, secure external power cart, and use a fireguard.
What would be the result of operating an engine with a lower grade of gasoline than specified?
Loss of engine power and efficiency. Also the probability of the engine overheating and engine damage.
What are the results of using aviation gas in a turbine engine?
A limited operation may be allowed by the manufacturer. Additives in the aviation gasoline could develop deposits on turbine blades and vanes which may cause a loss in engine efficiency, reduced service life, and possible engine damage.
What does the number 100 refer to in "100LL" aviation gasoline?
It is the lean mixture performance number (or octane rating) for the fuel.
What are some typical ground operation (engine runup and/or taxi) hazards to watch for or take precautions against?
(1) Foreign objects, loose hardware, rocks, gravel, etc. in the runup or taxi area. (2) Other aircraft or obstacles, including people. (3) The possibility of a fire, especially during start (use a fireguard). (4) Noise levels that can be damaging to hearing. (5) Turning propellers or rotors, prop or jet blast, and jet intake areas. (6) Hydraulic lock in radial engines (7) Weathervaning in tailwheel aircraft. (8) Limited or partially obstructed visibility from inside some aircraft.
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