Fuel Supply System 1-29 Flashcards
Usable amount of fuel (single point)?
approximately 1100 pounds
Usable amount of fuel (over the wing)?
1200 lbs
What is the primary refueling
method?
Single point pressure refueling is the primary refueling
method.
How many integral tanks?
3
When parking on ramps with greater than_______, the fuel system may vent fuel
overboard through a pressure relief valve.
1% slope
The fuel system incorporates an auto balance system to
keep the fuel level in the wing tanks within ________ of
each other.
20 pounds
When a fuel imbalance of________ or more is
detected for more than_________, the transfer valve will close the motive flow line to the light tank.
20 pounds; 30 seconds
If the fuel imbalance is not
reduced to less than___________ within__________ , the FUEL BAL annunciator will illuminate and the auto balance system will shut off
30 lbs; 2 minutes
The FUEL BAL annunciator will remain illuminated until the system is reset.
True.
If the auto balance system shuts off without reducing the fuel imbalance to 30 pounds or less, the auto balance system may be reset to
provide an additional 2 minutes to balance
the fuel load.
True
The fuel system includes ______ annunciators to indicate fuel system operations
6
What are the six fuel system annunciators?
red FUEL PX amber L FUEL LO amber R FUEL LO amber FUEL BAL green M FUEL BAL green BOOST PUMP
When will the red FUEL PX annunciator illuminate?
less than 10 psi fuel
pressure in the motive flow/return flow supply line.
When will the green BOOST PUMP annunciator illuminate?
- manually by selecting the BOOST PUMP switch ON,
- automatically by the low-pressure switch if the PCL is
above the IDLE position, - whenever the starter is
activated regardless of fuel pressure
When will the amber L/R FUEL LO annunciator illuminate?
activated by optical sensors and indicate fuel quantity below approximately 110 pounds in the respective wing tank.
When will the amber FUEL BAL illuminate?
if indicated fuel imbalance exceeds 30 pounds for 2
minutes or a fuel probe fails.
When will the green M FUEL BAL illuminate?
if the fuel balance switch is in the MAN/RESET position.
When should you not attempt to manually balance fuel load?
if alternate engine data display is indicating
FP FAIL. Reading may not be correct.
The fuel quantity indicating system uses ______ fuel probes.
seven.
three in each wing tank and one in the collector tank.
The outer probe provides fuel readings until approximately ______,
445±50 pounds
The middle probe provides fuel readings until approximately ______,
308±50 pounds.
The inner probe provides fuel readings until approximately ______,
20 pounds since the collector tank only has one probe and divides its capacity equally between the left and right fuel tank readings.
If a fuel probe fails, what will illuminate?
the amber FUEL BAL annunciator will illuminate and FP FAIL will display in amber text in the lower center portion of the AEDD
If the fuel gage does not show an imbalance in the event of an FP FAIL light, what can you conclude?
the failed probe is not being used to sense fuel.
