d05784.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 i Series
Edition 1/Rev. 2
73-00-00
Page 5
January 01/2014
1) Requirements of the fuel system
1.1) Operating limits
General note
See 912 i series Operators Manual, section 2.1) Operating Limits.
1.2) Fuel temperature
To avoid vapour locks, the fuel temperature must not exceed 45 °C
(113 °F).
Vapour locks may form at fuel temperatures above 45 °C (113 °F).
The fuel system must be installed in such a way to avoid vapour lock.
Vapour lock may result in engine stoppage.
Should such problems occur during the test period, than the affected
components, such as the supply line to the fuel pumps, must be cooled.
1.3) Fuel pressure indicator
General The fuel pressure is adjusted by a mechanical pressure regulator. The
pressure regulator is installed in the fuel line after Cyl. 4.
The reference pressure of the fuel system is the airbox pressure.
1.3.1) Location of the fuel pressure sensor
The fuel pressure sensor must be located before (upstream) the fine filter
so that the load state of the fine filter can be monitored.
The design and layout of the entire fuel system must
ensure engine operation within the specified operat-
ing limits.
In case of deviations in fuel pressure, the certification
according to the latest requirements such as FAR or
EASA must be carried out by the aircraft manufactu-
rer.
A fuel pressure indicator must be installed in the air-
craft in such a way that it is clearly visible to the pilot.
An increase of fuel pressure over the allowed limit
means that the fine filter is becoming contaminated.
The fine filter should be checked and replaced if nec-
essary.
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