Fuel & Warning Systems Flashcards
What is the surge bay used for?
main tank venting and fuel recovery allowing for positive pressure in the fuel tanks
How is the surge bay vented?
two internal standpipes connected to two NACA vents
Total usable fuel
5318kg
How does the collector bay gather fuel from the main tank?
four scavenge ejector pumps and flapper valves
What provides a constant low pressure/high volume fuel supply to the Fuel Metering Unit (FMU)?
Primary Ejector Pump mounted to the floor of the collector bay
How do the scavenge ejector pumps and primary ejector pump receive motive flow fuel?
high pressure/low volume motive flow fuel from the return line of the FMU
What serves as a backup source of fuel boost pressure?
two AC powered auxiliary fuel pumps, one mounted on the floor of each collector bay
1 or #2 ENG FUEL PRESS caution light
pressure at engine driven pump inlet is low, ejector pump failure or loss of motive flow to the ejector pump
1 of #2 FUEL FLT BYPASS caution light
engine fuel line has bypassed the filter
1 or #2 TANK FUEL LOW caution light
fuel senses 305 lbs of fuel remaining in collector tank
FUELING ON
Refueling/Defueling panel access panel is open and power is applied to the panel
How is fuel quantity determined?
a Fuel Quantity Computer uses nine capacitance-type fuel probes in each tank, or magnasticks on the underside of each tank
How is the fuel temperature measured?
Ambient fuel tank temperature via the left collector bay and shown on the MFD fuel page; engine inlet temperature or left and right engine fuel after it has passed though the Fuel/Oil Heat Exchanger is shown at the bottom of the ED
What do Warning Tone Generators do?
The two WTGs compute and provide the warning tones which alert the flight crew to specific events or system failures
What will trigger a takeoff warning horn?
- elevator trim out of takeoff range
- parking brake set to PARK
- condition levers not at max
- flaps extended more than 20 degrees or less than 3.6 degrees
- inboard or outboard spoilers are extended
