ATR 42 Model : 500
SYSTEMS DESCRIPTION
POWER PLANT
P 3
NOV 98
001
1.16
.
20
20.2 FUEL SYSTEM
The fuel supplied from the A/C fuel tank flows through :
- A fuel heater which includes :
. a screen
1
with a by-pass capability.
. a fuel heater element
2
. The source of heat is engine oil, and the fuel
temperature is thermostatically controlled. A fuel heater outlet temperature
indication is provided.
- A HP pump
3
with a filter, a clogging indicator is provided on pilot's panel.
- The Hydro Mechanical Unit (HMU) which has two functions :
. to meter the fuel flow delivery to the engine by a metering valve assembly
4
,
the excess being returned to HP pump inlet,
. to provide the HP motive flow required by the fuel tank jet pump through an
engine valve
5
.
- A fuel flowmeter
6
.
- A Fuel Cooled Oil Cooler (FCOC)
7
, that provides cooling of the lubricating
system by using fuel system as cooling source.
- A flow divider
8
to the fuel nozzles.
AA
R
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01/07//2018 REV 1 These notes are not revised after issue For Training Purposes Only
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