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What is the center of gravity restriction for a fuel imbalance during solo flight?
The right system cannot exceed twice the amount of the left system
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In the event of AC power failure, how could you check your fuel quantity?
- Hold the fuel/oxygen check switch in the QTY CHECK position
- Hold the fuel/oxygen check switch in the GAGE TEST position
- Activate either start button
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When will the fuel quantity low-level (FUEL LOW) caution light illuminate?
Within 7.5 seconds after either indicator reads below 250 pounds remaining
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While flying in the traffic patter, what procedure is recommended to balance the fuel
Use differential power settings
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With 1,000 pounds of fuel in each system, the right engine flamed out and will not restart. All other sytems are operating normally. After 10 minutes of single-engine operation, the left fuel system drops down to 750lbs while the right fuel system remains at 1,000lbs. How can the fuel switches be setup to guarentee the use of the fuel in the right fuel system
Use the crossfeed operation with the left boost pump OFF
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Four steps to crossfeed from the left system (right system low) and then return to normal operation.
- crossfeed switch ON
- Right boost pump switch OFF
- Right boost pump switch ON
- Cross feed switch OFF
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The fuel crossfeed allows you to
- Feed both engines from either system
- Feed either engine from both systems
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Which of the following statements describes the operation of the FUEL PRESS caution light
Illumination of the light indicates a loss of fuel pressure and possible boost pump fail
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The fuel (JP-8) capacity of the T-38C with single point refueling is
3906 usable
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During flight, your right boost pump is inop. Thr right system contains 1500lbs and the left is at 1200lbs. Which of the following would correctly allows you to balance the system
Differential power settings
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Normal refueling is done how?
single point refueling
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Single point refueling provides how much fuel?
3906lbs usable
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What kind of fuel is used?
JP-8
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How many pounds in the right tanks?
1990
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How many pounds in the left tank?
1916
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Over the Top refueling provides how much fuel?
3866lbs usable
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If being filled "Over the Top" which tank must be filled first?
Left
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How many fuel cells are there?
5
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Which fuel cells provide fuel to the left tank?
Fore and aft dorsal cells, and forward fuselage cell
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Which fuel cells provide fuel to the right tank?
Center and aft fuselage cells
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Where is the common vent located for the fuel tanks ?
In the tail above the rudder
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How many fuel probes are there?
7
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The fuel indicator displays total capacity or usable fuel?
usable fuel
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When does the FUEL LOW light illuminate?
when EITHER fuel indicator reads below 250 for 7.5 seconds
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Does the FUEL LOW light illuminate when you have 250lbs or less in the tank or when the indicator reads 250 or less?
indicated
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Will you still get the FUEL LOW light if you lose the fuel quantity indicator?
no
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What powers the boost pumps?
AC on the respective side
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How does the fuel system compensate for inverted or 0-G flight?
The boost pump is contained in and inverted flight chamber which traps enough fuel for short periods of time
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In MAX power, gravity feed should provide sufficient power up to what altitude?
25k
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In MAX power, gravity feed is guaranteed only to what altitude?
6k
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In MAX power and gravity feed, flameouts have occurred as allow as what altitude?
7k
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What powers the fuel shutoff valves?
Left essential DC
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Where are the fuel shutoff valves located?
after the boost pump and before the filter and pressure sensor
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What two ways can you close the fuel shutoff valves?
Fuel shutoff switch and throttle(s) - off
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Why don't you use the fuel shutoff switch in normal operation?
it can damage the fuel system
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What happens when the fuel filter becomes clogged?
filter is bypassed
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what indicates a bypassed filter?
red indicator extends from the underside of the aircraft
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Where is the fuel filter located?
after the fuel shutoff valve and before the pressure sensor
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Where are the boost pumps located?
at the bottom of the tank systems in an inverted flight chamber for each respective side
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What does the FUEL PRESS light indicate?
pressure is below 6 psi (normally 10). Possible leak or loss of boost pump
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Where is the fuel pressure sensor?
after the filter, before the engine
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With FUEL PRESS light on, crossfeed OFF, fuel shutoff in norm and throttle is out of off, is it boost pump fail or leak?
boost pump fail
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With FUEL PRESS light on, crossfeed ON, fuel shutoff in norm and throttle out of off, is it boost pump or leak?
leak
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Easy way to differentiate between boost pump fail and fuel leak with FUEL PRESS light?
crossfeed OFF is boost pump fail, crossfeed ON is fuel leak
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When is a normal momentary illumination of the FUEL PRESS light?
AB ignition
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How much of an imbalance before using crossfeed?
200lbs
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Can you transfer fuel from one tank system to another using crossfeed?
no
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If operating single engine, how do you use all the available fuel in both sides?
crossfeed
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When crossfeeding with only one engine (using fuel from both sides), the engine is fuel by which tank group?
the one with the stronger boost pump
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When less than 250 lbs in either system managing balance is less important than what?
preventing a flameout
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When less than 250 lbs in either system, what should be done to prevent flameout?
Both boost pumps on, crossfeed on
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With both boost pumps on, crossfeed on and one tank empties, what happens?
the other tank takes full over fuel feeding
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The RCP boostpump and crossfeed lights indicate what?
switch position and not actual operation
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What 5 times do you not cross feed?
- Boost pump fail
- Fuel leak
- Fuel quantity malfunction
- Two engines and low altitude
- Two engines and low fuel
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How is the engine fuel if the boost pump is inop?
- gravity feed
- With one to two engines and one to two fuel systems (left/right) when will gravity feed provide sufficient fuel gravity feed should be sufficient for 2 engine and 2 fuel systems, 1 engine and 2 fuel systems, but may NOT be sufficient for 2 engines and 1 system
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