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The diagram shown in annex represents a jet fuel system The fuel flow measurement is carried out 868 ? Professional > orientation

exemple question 152
After high pressure valve (item 4). Fuel rate is measured after passing through main engine fuel shutoff valve the fuel flow rate can be read on display unit is also sent to flight management system .


The purpose of the barometric correction in a fuel controller is to ?

exemple question 153
The purpose of barometric correction in a fuel controller to Maintain correct fuel to air mass ratio when altitude increases. The fuel control unit (fcu) controls fuel flow a given thrust setting variations in air intake pressure (p1) require that fuel flow to burners changed accordingly so that a fixed r p m maintained a selected throttle position at all altitudes airspeeds this achieved the expansion or contraction of a capsule influenced p1 pressure which in turn modifies fuel flow accordingly this capsule known as barometric pressure capsule (b p c ) incorporated in an 'altitude sensing unit' within f c u the goal not to maintain a constant fuel flow whatever altitude is goal to maintain correct fuel to air mass ratio when altitude increases or decreases to maintain a given thrust whatever altitude is.


At Reference In flight with centre tank empty and APU operating a fuel unbalance is detected quantity in tank 1 < quantity in tank 2 Rebalancing of the two tanks is 872 ?

exemple question 154
At reference in flight with centre tank empty and apu operating a fuel unbalance detected quantity in tank 1 < quantity in tank 2 rebalancing of two tanks 872 Possible with 'crossfee open tank pumps 'off' tank 2 pumps 'on'. The fuel control unit (fcu) controls fuel flow a given thrust setting variations in air intake pressure (p1) require that fuel flow to burners changed accordingly so that a fixed r p m maintained a selected throttle position at all altitudes airspeeds this achieved the expansion or contraction of a capsule influenced p1 pressure which in turn modifies fuel flow accordingly this capsule known as barometric pressure capsule (b p c ) incorporated in an 'altitude sensing unit' within f c u the goal not to maintain a constant fuel flow whatever altitude is goal to maintain correct fuel to air mass ratio when altitude increases or decreases to maintain a given thrust whatever altitude is.


exemple question 155
One of purposes of fuel system booster pumps to be submerged in fuel To facilitate priming of pumps. The pumps are cooled the fuel lubricated it to achieve these functions pumps would not need to be submerged in fuel action of flow through pumps would suffice it important that pumps only pump fuel not air to this end ensuing pumps are submerged in fuel will keep them primed with fuel.


exemple question 156
The vapour lock A stoppage in a fuel feeding line caused a fuel vapour bubble. The pumps are cooled the fuel lubricated it to achieve these functions pumps would not need to be submerged in fuel action of flow through pumps would suffice it important that pumps only pump fuel not air to this end ensuing pumps are submerged in fuel will keep them primed with fuel.


exemple question 157
The pressurising function of pressurising and dump valve in a gas turbine engine fuel system To admit fuel to nozzles only if fuel pressure high enough sufficient atomisation. a pressurising dump valve used with a duplex fuel nozzle at a preset pressure pressurising valve opens allows fuel to flow into main manifold as well as pilot or primary manifold the dump valve allows manifold fuel to be dumped into drains tank when engine shut down to prevent fuel boiling in manifold due to residual engine heat.


exemple question 158
Fuel pumps submerged in fuel tanks of a multi engine aircraft are Centrifugal low pressure type pumps. They are known as 'lp pump also 'booster pump (less than 3 bars 40 psi) engine driven pumps would come under engine fuel system dividing line being made at low pressure cock or valve.


8
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at a lower temperature than that jet b I incorrect ii incorrect. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


9
Which statement correct i the freezing point jet a at a higher temperature than that jet b ii the flash point jet a at a higher temperature than that jet b I correct ii correct. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


10
Which statement correct i the freezing point jet a at about same temperature as that jet b ii the flash point jet a at a higher temperature than that jet b I incorrect ii correct. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


11
The fuel oil heat exchanger Cools oil heats fuel. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


12
Fuel gas turbine engines usually heated in order to Prevent icing up of lp filter. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


13
Fuel flow information gas turbine engines Measured in line between fuel control unit the engine burners. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


14
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at a higher temperature than that jet b I incorrect ii correct. Jet kerosene (jet a1 or jet a) jet gasoline (jet b) aviation gasoline (avgas) are names given fuel jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


15
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at about same temperature as that jet b I incorrect ii incorrect. Jet kerosene (jet a1 or jet a) jet gasoline (jet b) aviation gasoline (avgas) are names given fuel jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b (see below) jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


16
Which statement correct i the freezing point jet a at a higher temperature than that jet b ii the flash point jet a at a lower temperature than that jet b I correct ii incorrect. Jet kerosene (jet a1 or jet a) jet gasoline (jet b) aviation gasoline (avgas) are names given fuel jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


17
Specific fuel consumption a turbo prop engine can be expressed in kg per Hour per unit of shaft power. Jet kerosene (jet a1 or jet a) jet gasoline (jet b) aviation gasoline (avgas) are names given fuel jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


18
The dc pump in left main tank operates automatically to provide fuel to 873 Apu when ac power not available the apu selector on. Jet kerosene (jet a1 or jet a) jet gasoline (jet b) aviation gasoline (avgas) are names given fuel jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures but in practice that not a useful property of jet b jet fuel a blend of many different hydrocarbons that each have their own specific freezing point so it not really possible to quote a freezing point temperature the 'pour point' the term used in aviation industry to specify minimum safe temperature anti ice additives such as 'prist' are used in jet a at cold temperatures so that it can still be pumped without reducing fuel flow at 70°c more than sufficient any jet aircraft even at 10 15°c below first component to freeze (usually paraffin wax) jet fuel can still be pumped the accepted minimum fuel temperature safe flight jet a 40°c jet a 1 47°c jet b 65°c flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point jet b has a flash point of below 0°c jet a around 38°c a low flash point a useful property to start a jet engine in cold weather but reduces amount of energy stored in fuel remember that lower flash point more 'volatile' fuel is.


19
What the density of jet a 1 Apu when ac power not available the apu selector on. Density of jet a 1 at 15 °c 0 804 kg/l.


20
What does expression 'usable fue mean The total amount of fuel that can be supplied to engine. Density of jet a 1 at 15 °c 0 804 kg/l.



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