TBM
PILOT’S OPERATING HANDBOOK
700
SECTION 7
DESCRIPTION
Page 7.7.8
Edition 1 -- November 30, 2010
Rev. 0
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 us gal (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
-- ”AUX BOOST PMP ON”:
Electric fuel pump running (manual or automatic
mode)
-- ”FUEL LOW L--R”*
: Fuel quantity less than or equal to 9 us gal
(34 Litres) of usable fuel in specified tank
-- ”AUTO SEL”
: Sequencer inactive or operating defect
* Only affected side (L, R or L--R) displayed in CAS message