Pilot's Operating Handbook
Section 7
Description
Edition 0 - October 31, 2013
Rev. 4
Page 7.7.8
Main mechanical boost pump
The mechanical boost pump is attached to accessory gearbox and supplies fuel
nec
essary for engine operation.
Engine fuel system
The engine fuel system consists of a fuel regulator, pumps, filters, a fuel divider and
fuel nozzles. The system provides the fuel flow necessary to satisfy the engine power
and rating needs.
The fuel coming from airplane system goes through a heater which is automatically
controlled by a thermostatic valve.
Fuel gaging installation
Fuel gaging installation is a capacitive type. Fuel data are displayed in us gallons.
Thr
ee fuel level gages are installed in each tank. The wing root side fuel level gage is
equipped with a low level detector which leads to fuel low level CAS messages
appearance, when usable fuel quantity remaining in the concerned fuel tank is under
about 9 USG (34 Litres).
Fuel system monitoring
Fuel system monitoring is ensured by CAS messages :
- FUEL OFF : Fuel tank selector set to OFF
- FUEL PRESS : Fuel pressure at mechanic pump outlet under
10 psi (± 2 psi)
- AUX BOOST PMP ON : Electric fuel pump running (manual or
automatic mode)
- FUEL LOW L-R * : Fuel quantity less than or equal to 9 USG
(34 Litres) of usable fuel in specified tank
- AUTO SEL : Sequencer inactive or operating defect
-
FUEL IMBALANCE : Fuel tanks imbalanced by more than 15 USG
(57 Litres) for more than 30 seconds
* Only affected side (L, R or L-R) displayed in CAS message
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