Fuel Flashcards
Total usable fuel?
2574kg (1287 per side)
What powers the Aux pumps?
115VAC
What is the consequence of taking off the the FUELLING ON caution?
Fuel transfer not possible
TANK FUEL LOW
less than 59kg in collector bay.
Could be caused by a blocked or failed pump, Stuck flapper valve or a fuel leak. QRH
Max fuel imbalance?
272kg
From where is the Fuel drawn into the engine?
The collector bay
ENG FUEL PRESS
Less than 5.5PSI in the low pressure feed line to the HP EDP. Could be a motive pump failure, or a fuel leak. QRH
FUEL FLTR BYPASS
More than a 1PSI difference either side of the HP EDP. (Impending bypass)
Bypass occurs at 3PSI.
Turn on Aux pump/QRH
How could you tell if the aux pump has failed?
No green light when selected on
How many magna sticks are there in each tank?
2
What is the source of motive fuel for Scavence pumps and the boost ejector pump?
high pressure return fuel from the EDP
When are the Aux pumps used?
T/O, LDG, Fuel XFer, QRH
How is fuel heated?
Passes through a oil/fuel heat exchanger before the EDP.
Which Aux pump is automatically turned on when transferring fuel?
Donor tanks pump
where is fuel temp measured?
after LP filter and heater
how many probes are there to measure fuel quantity?
6 in each tank (1/6 in the collector bay)
What tank is the tank fuel temp taken from?
LH
Why have 3 scavenge pumps plus and aux pump but only one ejector pump?
Extra flow into collector bay creates mixing in the tank which prevents ice forming
What is the pressure in the LP fuel line normally?
~20PSI
What powers the Fuel shutoff T handle?
Battery bus
What is the Surge tank used for?
Tank venting and overflow protection
Can we take off with a dump valve stuck open?
No
What is the consequence of a dump valve being stuck open?
No fuel xfer
What is the pressure after the HP EDP?
980PSI
Will the Aux pumps operate if engines are off and plugged in to a GPU?
No (115VAC bus)
How do we calculate manual fuel use if the fuel sheet is outside limits (meaning a dip would be required)
11kg/min +30kg taxi fuel
What is the max diff between arr and land gauge fuel numbers (also dep and t/o gauge if not refuelling)
100kg
