Flashcards in Fuel System Deck (13):
How many fuel cells?
5 - 3 upper, 2 underfloor
+ supplements for either 1 or 2 20/90 aux tanks
How many and where is the refueling port(s)?
One, right side
219.6 gallons = 1493.3 lbs
+ 90 gal aux tank ~ 307 gallons = 2087.6 lbs
Rough formula: Mast torque x 10
Lower Fuel Cell Components
Fuel boost pump
Fuel flow switch
Fuel float switch
Fuel sump drain valve
Fuel-pressured-powered ejector pump
Two fuel quantity probes
What is the purpose of the fuel float switch?
Illuminates FUEL LOW Caution light when below 70 lbs.
Total fuel remaining lasts ~10 mins at MCP.
What is the purpose of the lower fuel cell interconnect valves?
Ensures that if a boost pump fails, the fuel remaining is accessible to he other boost pump.
How are the interconnect valves actuated?
28 VDC from #2 Essential BUS
INTCON switch on the fuel panel
Are the interconnect valves open or closed in NORM?
Reasons to open the interconnect valves
Fuel level is low
Boost pump failure
Engine shut down in flight
What powers the fuel valves?
Fuel valve switch
28 VDC from respective Essential BUS
When does the FUEL VALVE Caution light illuminate?
Anytime a fuel valve either opens or closes