FUEL

Question 1

AVGAS
Higher octane - higher max compression ratio (eff)

Octane rating characterizes the;
Anti knock capability
Resistance to corrosion

Low lead
The alloys used in aviation engine construction are chosen for their durability and synergistic relationship with the protective features of lead.

Answer 1

Yüksek oktan olursa detonasyon (vuruntu) ya da anti knock önleyici özelliği olur

Low lead - az kurşunlu yakıt yüksek rpmde kullanmayı sağlıyor uçaklarda pozitif.

Question 2

Aviation Kerosene- AVTUR

Denser than AVGAS - low volatility

Question 3

Freezing point & flash point = JETA>A1>B

FLASH POINT = The fuel temperature at which under std conditions the vapor ignites in contact with a flame and extinguishes immediately,

Answer 3

Donma ve parlama noktalari a’dan b’ye dusuyor

Question 4

Baffle - reduces unwanted movement of fuel in the tanks and prevent surge of fuel

Question 5

Feed box - pompa boş çalışmasın diye sıvı iletir.

Question 6

Fuel Vent
To breathe the fuel tank, so when you overfill the tank it has a place to excape.

On a transport type aircraft the fuel tank system is vented through ram air scoops on the underside of the wing.

Answer 6

ATMOSFER HAVASIYLA HAVALANDIRDIĞI İÇİN SU PARTİKÜLLERİ YAKIT TANKININ İÇİNDE OLUŞABİLİR. BUNU SABAHLARI DRAIN EDİYORLAR.

Question 7

Yakıt tankı basınçlandırılması - nitrogen purging ile sağlanır.

Question 8

FUEL CHECK
Water, air or some microorganisms can develop inside the tank and endanger the engine due to blockage in feeding lines, icing or corrosion

The fuel tanks of aircraft must be checked for water before the first flight or after a long turnaround time.

Question 9

Üstten kanatlı uçaklarda mekanik yakıt pompası KULLANILMAZ. Yakıtı gravity sayesinde motorlara rahat rahat iletebilir.
Elektrikli yardımcı pompası kalkış aşamasında yardımcı olması amacıyla kurulur

Answer 9

Mekanik, motorun dişlilerine bağlı…. seyrüsefer sırasında pompa

Question 10

Vapor lock
High atmospheric temperature cause gas to vaporize and block fuel flow in the line.

Vapor lock - heat produces bubbles in fuel line.

Answer 10

Vapor lock forming are

High fuel temp
Critically low fuel level
Low ambient pressure

Question 11

Booster pump (low p - centrifugal pump)
BP fuel supply system 20-50 psi

3ph 115-200VAC 400Hz

Avoid vapour locking and prevent cavitation of the HP fuel pump

On most transport aircraft, low pressure pumps of the fuel system are: centrifugal pumps, driven by electric motor.

Answer 11

Uçaklarda 115-200 VAC 400Hz kullanılıyor.

Low pressure pump - centrifugal&raquo_space; electrical pump

Question 12

Pressure is measured in the line between the booster pump and the engine or at the outlet of the high pressure filter

Answer 12

Ingition is activated before fuel is delivered by the HPSOV (hi-pressure shut-off valve) to the fuel nozzles

Önce çakmak kıvılcımı, sonra gaz.

Question 13

Cross-feed valve

To supply of any jet engine from any fuel tank
Adjust fuel distribution

Question 14

Heat Exchanger

Fuel supply system on a jet engine includes a fuel heating device to prevent icing formation from water contained in the fuel

Oil is cooled, and fuel is heated in HX

Fuel heaters are located at the engines

Fuel for gas turbine engines is usually heated in order to prevent icing-up of the LP filter.

Question 15

Automatic fuelling shut off valve stops fuelling as soon as a certain fuel level is reached in tank

During refueling the auto shut off valves will switch off the fuel transfer system when the fuel has reached a predetermined mass.

Question 16

Fuel measurement

Capacitance can be changed by changing
Size of the plates
Distance between the plates
Dielectric value of material between

Fuel qty is indicated by measuring the dielectric change between fuel and air.

Sıcaklıktan etkilenmiyor yalnızca mass bilgisi veriyor

Answer 16

In a compansated capacitance …. 8000 kg fuel temp inc vol %5…. indicated fuel mass would remain the same

Question 17

FUEL MEASUREMENT - Fuel Control Unit te yapılıyor.

Gaz kolunuzea göre ne kadar yakıt göndermessi gerektiğini belirliyor.

Fuel flow measurement is done after high pressure valve.

Fuel flow information for gas turbine engines are measured in the between the fuel control unit and the engine burners.

Question 18

LP Fuel Pump > HP Fuel Pump > Fuel Control Unit > Heat Exchanger > Nozzles

Answer 18

3ph 400Hz 115VAC

Question 19

Fuel pressure is measured:

Answer 19

In the line between the booster pump and the engine

// or at the outlet of the high pressure filter

Question 20

Fuel flow measurement is carried out

Answer 20

After high pressure valve

Question 21

Fire precautions to be observed before refuelling are:

(En uzun)

Answer 21

All bonding and connections to the earth terminal between ground equipment and the aircraft should be made before filler caps are removed

Question 22

The ventilation system in a fuel tank

Answer 22

Prevents low pressure or overpressure in the tank

Question 23

The pressurization of tanks is maintained by the fuel

Answer 23

Vent system

Question 24

Functions of an LP booster pump in a gas turbine fuel system are to:

Answer 24

Avoid vapour locking and prevent cavitation of the HP fuel pump.

Question 25

Vapour lock is:

Answer 25

Vaporizing of fuel prior to reaching the carburator

Question 26

Vapour locking is caused by:

Answer 26

Vaporizing of fuel prior to the engine.

WATER ile alakası yok!!!

Question 27

Vapour lock is the phenomenon by which

Answer 27

Heat produces vapour bubbles in the fuel line