XlS AIRCRAFT GENERAL Flashcards
Memorize (179 cards)
XLS DIMENSIONS
55.7’ wide
52.73’ Long
17.2’ High
Turning Radius
70.60’ Wingtip
Engine off Tank-to-tank x-feed rate
Transfer rate is dependant on the receiving engines requirements but it is generally 700-900 lbs/hour with
the engines shut down.
LOW FUEL PRES light illuminates when ? Extinguishes when ?
<5psi. Extinguishes >7 psi.
When X-feed is selected, what happens ?
Boost pump on supplying side activates (Fuel Boost L/R light illuminates)
X-feed valve opens (Fuel X-Feed advisory light illuminates when fully open)
Motive Flow on receiving side is energized closed 3 seconds after X-feed selected.
Motive Flow on “supply” fuel tank, is now providing fuel to opposite engine and tank
What if the X-feed valve doesn’t open all the way when de-selecting X-feed ?
FUEL X-FEED advisory light illuminates flashing and activates the MC light steady.
How many fuel pumps types are there per engine ?
6
1 Fuel boost pump
1 Engine driven fuel pump
1 Primary ejector pump
3 Ejector pumps
What will happen if you select X-feed but have the fuel boost pumps in the OFF position ?
x-feed valve will not open BUT the primary motive flow (receiving tank) will close resulting in a
LO FUEL PRESS light. Engine flameout may occur.
What indication that the motive flow has failed (Boost pump in the NORM position)
3 parts
LO FUEL PRESS light flashes on momentarily…boost pump auto starts due to lo fuel pressure condition…
FUEL BOOST light illuminates
Fuel planning estimates
Reserve: 900 lbs
Taxi: 200 lbs
1 st Hour 1600 lbs
2 nd Hour 1400 lbs
3 rd Hour 1200 lbs
How many fuel drains per wing ?
5
What are the primary ejector pumps for and how many are there ?
1 per wing. Takes over the function of supplying fuel to the eng driven fuel pump at around 45 % N2
during start.
What do the scavenger pumps do and how many are there ?
3 per wing. They re-distribute fuel from unusable portions of the fuel tank directly to the fuel hopper
(where the primary ejector pump sits) so that the ejector pump can continue to supply fuel to the engine.
When fuel transfer is selected, what does the motive flow shutoff valve do and when ?
Shuts off primary ejector pump flow in the “receiving” tank during x-feed.
How do you activate the fuel shutoff valves ? How do you re-open them ?
Press the FIRE button once. Pressing a second time opens them back up.
Fuel quantity system consists of what ?(4)
- Fuel capacitance probes – 7 (signal to the fuel quantity indicators)
- Low level fuel float switch – 1 per wing (signal to Lo Fuel Level L/R light)
- Fuel flow meter – 1 in each engine just downstream of the fuel control unit (signal to fuel flow gauge)
- Fuel temp sensors – in the fuel sump area (send signal to the fuel temp sensor)
What is important to remember if you get a R/L FUEL GAUGE light ?
Do not remove DC power until the BIT test lights can be confirmed by maintenance
When must the fuel boost pump switch be in the ON position ?
<400 lbs
What type Hyd system ?
Open center system
Hyd system unpressurized psi ? Pressurized psi ?
60 psi/1500 psi
Why do you descend to FL 310 and reduce speed to 200 kts if hyd system remains pressurized
during flight ?
Air has poor cooling qualities above 310 and the speed restriction reduces the engine rotation/hyd pump
rotation speed to help cool the hyd pump
When does the Hyd system fully pressurize ?
When a service is commanded (flaps/gear/speed brakes/TR’s/stabilizer)
Delete
How does it pressurize ?
Delete
Hyd Ctrl Valve controls pressurization/de-pressurization of the system – heart of the system
Is there pressure in the hyd reservoir with engines off ?
Yes – spring-loaded piston pressure to provide head pressure to pumps & absorb pressure spikes
-SPEEDBRAKES-