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SECTION 7
DESCRIPTION
MAIN MECHANICAL BOOST PUMP
The mechanical boost pump is attached to accessory gearbox and supplies fuel necessary 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. Three 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 PRESS"
-
"AUX BOOST PMP ON"
-
"FUEL LOW L-R"
-
"AUTO SEL"
-
"FUEL IMBALANCE"
-
* Only affected side (L, R or L-R) displayed in CAS message
FUEL SYSTEM DRAINING AND CLOGGING INDICATOR
The fuel system comprises five drain points, a drain on the filter bowl, two drain valves on each tank, located on
wing lower surface, one at wing root and the other past main landing gear well.
These drains allow draining water or sediments contained in fuel.
Fuel tank drain valves are provided with a slot which allows opening them with a screwdriver.
Fuel system draining shall be performed prior to the first flight of the day and after each tank refueling, using a
sampler to pick off fuel at the two drain valves of each tank and at the filter vent valve.
A red filter bypass flag on the fuel unit and visible from outside, when an inspection door located on L.H. side under
front baggage compartment is open, indicates filter clogging. A push-button, adjacent to the inspection door,
controls the illumination of a light provided to improve visibility of the clogging indicator. This indicator shall be
observed during preflight inspection.
When filter gets clogged in flight, the filter is by-passed in order not to deprive power
plant from fuel. The power plant is then supplied with non-filtered fuel.
Page 7.7.8
: Fuel tank selector set to OFF
: Fuel pressure at mechanic pump outlet under 10 psi
: Electric fuel pump running (manual or automatic mode)
*
: Fuel quantity less than or equal to 9 USG (34 Litres) of usable fuel in
specified tank
: Sequencer inactive or operating defect
: Fuel tanks imbalanced by more than 15 USG (57 Litres) for more than
30 seconds
NOTE
PILOT'S OPERATING HANDBOOK
(Figure 7.7.4)
Edition 0 -- October 31, 2013
Rev. 1
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