Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-70
26-Jul-2017
FUEL SYSTEM
The fuel system is comprised of the following subsystems:
• Fuel tanks / storage
The CRJ has three tanks: two wing and one center tank
• Fuel management (transfer/crossflow) & distribution
• Fuel quantity gauging
FUEL TANKS / STORAGE
Fuel is stored in both wing and the center tank. The wing tanks are emptied first. With decreasing fuel in the
wing tanks, fuel is transferred from the center tank into the wing tanks, in case the center tank is filled.
Tank
Useable fuel
Unusable fuel
Total fuel
Left wing tank
7’493 lbs / 3’399 kg
62 lbs / 28 kg
7’554 lbs / 3’427 kg
Center tank
4’610 lbs / 2’091 kg
32 lbs / 14 kg
4’642 lbs / 2’106 kg
Right wing tank
7’493 lbs / 3’399 kg
62 lbs / 28 kg
7’554 lbs / 3’427 kg
Total
19’750 lbs / 8’960 kg
FUEL MANAGEMENT (TRANSFER/CROSSFLOW) & DISTRIBUTION
Fuel transfer from the center to the wing tanks is done automatically. The monitoring computer stars transfer
as soon as the wing tank’s quantity drops below 93% and ends transfer either when the center tank is empty or
the wing tank reaches 97%. Fuel crossflow between the wing tanks may be performed powered or by gravity.
Fuel crossflow is used to equalize imbalances between the wing tanks to maintain lateral stability.
A pump in the center tank provides powered crossflow either in automatic or in manual mode. In automatic
mode, a computer monitors imbalanced and starts equalizing on its own. This mode may be overridden by the
crew and crossflow controlled manually.
The following graphic shows how valve positions are displayed on the Fuel EICAS Synoptic page.