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27 Cards in this Set
- Front
- Back
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what is used as the sensor in the fuel tank for an electronic type fuel quantity indicating system? |
tubular capacitors that extend across the fuel tank from top to bottom |
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what is the principle upon which the electronic type fuel quantity indicating system operates? |
tubular capacitors extending across the fuel tanks change their capacitance as the fuel level changes |
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what is used as a sensor in the fuel tank for the older resistance type fuel quantity indicating system? |
a variable resistor with an arm that is moved by a float riding on top of the fuel tank |
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what are two types of fuel cells used in modern aircraft? |
integral and bladder cells |
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why are fuel tanks divided into compartments or have baffles installed in them? |
keep the fuel from surging |
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what is the purpose of a drip gage in the fuel tank of a large aircraft? |
allows a mechanic to check for fuel levels from the bottom of the tank |
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what markings must appear near the filler opening of the fuel tanks on reciprocating engine aircraft? and on turbine aircraft? |
recip engines- the word AVGAS and the minimum grade fuel TURBINE - the word JET FUEL, permissible fuel designations, maximum permissible fueling supply pressure, maximum permissible defueling pressure |
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where can you find the correct part number for the fuel quantity sensor to be installed in an aircraft fuel tank? |
IPC |
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when must the fuel quantity indicating system indicate zero? |
during level flight when the fuel in the tank is equal to the unusable fuel supply |
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where are fueling system strainers located? |
one strainer located in the outlet , main strainer located in the fuel line between the outlet and the inlet of the fuel metering device |
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why do the fuel strainer used on some turbine engine aircraft have a warning device that signals the flight crew when the strainer is beginning to clog up? |
strainers clog because ice forms on the filler element. flight crew can route the fuel through fuel heater to melt the ice |
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what must be done after a fuel system strainer has been cleaned or replaced? |
must be tested for leaks by pressurizing the system with the boost pumps if one is used |
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why is it important to drain all of the fuel sumps before the first flight of the day? |
water can condense and it must be drained |
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is the procedure of draining the sumps with the aircraft in the ground attitude an assurance that all of the water is removed from the tanks? |
no, some require special procedures to remove all the water. refer to AFM |
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how does water appear in the fuel drained from the tank sumps? |
as a clear globlule in the bottom of the container |
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what color is grade 100-LL fuel? |
blue |
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how can you detect jet fuel in the sample take from the tank sump drains? |
jet fuel is clear and it has an odor similar to kerosine |
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what must be done if the sump drains sample shows traces of jet fuel? |
fuel system must be drained and flushed out with the proper grade of aviation gasoline |
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why must an aircraft fuel valve have a detent in its operating mechanism? |
gives the pilot a positive indication by feel when the selector valve is in the full ON and full OFF position |
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what must be done before a fuel selector valve can be removed from an aircraft? |
the tank to which the valve is connected must be drained or otherwise isolated |
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what must be done after a fuel valve is replaced? |
fuel system must be checked for leaks |
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how is a fuel leak indicated on a recip engine powered aircraft? |
the dye in the gasoline stains the area around the leak |
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what is the function of the sump in a fuel tank? |
it collects water and contaminants and will have a drain to remove them |
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what are the three different types of fuel tanks? |
built up tanks, integral and bladder |
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what problem can occur in a bladder tank with a blocked vent?
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cause the tank restraints to fail and block the fuel outlet
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how do you prepare an aluminum fuel tank for welding? |
remove fuel and wash tank, with hot water and detergent. purge the tank with steam for 30 min to remove vapors |
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after welding an aluminum fuel tank, what pressure should the tank be tested with? |
3.5psi |
