Airframes & Systems
T1, T2a
T1, T2a
Fichier Détails
| Cartes-fiches | 499 |
|---|---|
| Langue | Deutsch |
| Catégorie | Technique |
| Niveau | École primaire |
| Crée / Actualisé | 10.11.2014 / 01.01.2023 |
| Lien de web |
https://card2brain.ch/box/airframes_systems
|
| Intégrer |
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Fuel: Fuel system into two groups
1. fuel storage and feeding system
2. engine fuel control system
Fuel: piston engines uses? Flash point ? freezing point?
AVGAS 100 (Octane number) => flash point: 25 freezing point: -60
Fuel: cross bleed
Luftbezogen
Fuel: Cross Feel
Fuel bezogen => Querrspeisung
DC
Gleichstrom
AC
Wechselstrom
Bei einem Leak fliest das Oel immer in das Fuel oder umgekehrt
Bei einem Leak fliest das Oel immer in das Fuel => sonst Entzündung => Jedoch unterschiedlich sein => Bei, Fuel heater ist es umgekehrt
MOGAS ?
car engine => low octane number => low boiling point
2 fuel feed system
1. gravity fuel feed system
2. pressure fuel feed system
Fuel: the vent system is for what ?
a) suction inside the tank in case of decreasing ambient temperature and fuel usage
b) exceeding pressure inside the tank in case of increasing ambiet temperature
Fuel: For what are Drains?
provided for the elimination of sediments and condensed water that fuel may contain => placed in the tank sumps and at the lowest points
Fuel: What is installed at the opening through which is fuel is taken from teh tank
screens (Schutz) and filters
Fuel: How you can shut off teh fuel supply to teh engines
With a firewall shutoff valve
Fuel: cross-feed?
the system connects the fuel from each tank to any engine
Fuel: EDP: ?
Engine driven pump: is necessary to produce the fuel pressure needed to inject fuel into the engine => Failures of EDPs leads to a complete engine failure
Fuel: electrical auxiliary pumps for what?
a) deliver fuel when the engine-driven fuel pump is not operating => engine start
b) Operation during EDP failure
c) increasing fuel pressure
Fuel: Primer Pumps?
Deliver addiontional fuel from teh tank to the cold engine to ensure a proper engine start
Fuel: below 0 Grad what happens with the fuel?
freezing of dissolved water
Fuel: below -20 Grad what happens with the fuel?
Formation of paraffin
Fuel: Fuel absorbs water => more water can be absorbed with?
with higher humidity and a t higher fuel temperatures
Fuel: Jet Fuel?
JET A1: flash point + 38 Freezing point: -47
JET A: flash point: + 38 freezing point: -40 => First alternative
JET B: military aviation flash point: 20 (make it dangerous) freezing point: -60
Fuel: higher altitudes the fuel capacity to retain dissolved water is reduced what happens with teh water ?
water can form into ice crystals or remain as super cooled water
Fuel: 3 types fo fuel tanks ?
a) Rigid; Fixed builet in tanks; Drum tanks => made of aluminium => exchangable => not all of the available volume in the wing is used
b) Built in Cell tanks (Bladder): flexible containers made of multiplayer synetic rubber and nylon tissue => teh double walls and elasticity of the tank => disavtantage: higer weight
c) Intergral tanks: structure of the wing is at the same time the wall of the tank => the whole wing interioir is used=> largest space with the lowest weight => repair work is difficult and expensive
Fuel: How you prevent the C.G. during Roll?
the tanks are equipped with baffle walls and the baffle check valves => usually the wing ribs serve as baffle walls
Fuel: How is the bost pump also called
AC-fuel pump, low pressure fuel
Fuel: Where is fuel boost pump (AC Fuel pumps or low pressure fuel) installed?
in the collector box
Fuel: The engine operation time limits could arise, if the teh boost pumps are inoperative. why?
due to suction (saugen), fuel vapors (verdampfen) and this can lead to cavitation (blasenbildung) in the engine driven pumps
to cavitation
Blasenbildung
to suction
saugen
to vaporise
verdampfen
Fuel: Foe the centre tank what is not possible?
bypass
Fuel: why set the water at the lowest point in the tank?
Water has a higher density than fuel and settles at the lowest point
Fuel: shut off valves are under pressure. which pressure?
ca. 35 PSI
Fuel: In case of a larger fuel leaks, what happens?
in case of a larger fuel leak, fuel flows via the drain pipe amid a spur pipe to the leak monitor. the leak monitor works like a fuel drain valve. the leaking fuel is drained overboard.
Fuel: Signals from the fuel in teh cockpit?
fuel mass in each tank; fuel temperature and pressure; cross feed valve position
Fuel: quantity measuring system fails, how you can check the fuel
by a drip stick and magnet stick
Fuel: What is teh purpose of the fuel vent system?
to prevent build up of excessive positive or negative pressure inside the fuel tanks and to provide ram air air pressure in the tanks during flight
Fuel: WHat is the Inerting Technology in Fuel Tanks?
Inerting is an inclusion of a special gas in the area the fuel level in fuel cells, to prevent an ignition of a mixture of fuel-vapour and air (oxygen)
Fuel: OBIGGS?
On board inert gas generation system, => often used in large transport airplanes (Inerting technology in fuel tanks)
2 types of refuelling ?
1. Ovwering Gravity Fuelling: fuelling ports which are used as primary filler receptacles
2. Underwing pressure fuelling: refuelling teh outboard tanks are filled first
=> if they are filled and no more fuel is needed, the inboard or centre tanks are filled
=> pressure fuelling systems have top off control units in each tank => a solenoid fuelling valve closes, when teh quantity indicating system signals that the tank is full
