BRP-Rotax
INSTALLATION MANUAL
When the engine is running or when the engine is turned off ( and the Fusebox is not sup-
plied with external power), the EMS circuit works isolated from the rest of the aircraft.
Therefore following components need to be installed decoupled from the airframe ground:
• ECU
• Regulator A (Fusebox)
• Starter relay
The engine block must be connected to the airframe using a properly sized ground strap
(minimum the same cable cross section as the starter supply but at least 10 mm
2
), for car-
rying the starter current and to avoid static electricity between the engine and the
airframe.
To gain full lighting compliance the shock mounts must be shorted-out by using ground
straps (10 mm
2
).
BATTERY
ATTENTION
The use of rechargeable batteries with lithium–ion technology should only be
used in combination with a suitable battery management system. If such an bat-
tery is used, the responsibility is up to the aircraft manufacturer. The approval of
the relevant aeronautical authority may be necessary. For installation of lithium-
ion batteries refer e.g. to FAA AC No: 20-184
The specification of the battery must ensure that during each operating state and also dur-
ing the transition between two operation states a sufficient supply of the avionics is guar-
anteed (e.g. during engine start). Depending on the applicable regulations avionics need
to be supplied for at least 30 minutes with energy after a failure of the primary power sup-
ply in case they are required for safe operation of the aircraft.
If the aircraft is regularly started at temperatures below - 5 °C (23 °F) (ambient- and oil/
coolant temperature are below this temperature) it is recommended to provide a connec-
tion for an external power supply and a possibility for adequate engine pre-heating.
ATTENTION
If all consumers are active, take care not to discharge the battery deeply.
Following battery specifications are recommended:
Interface
Parameter
Min.
Max.
Nominal
Nominal Input
Voltage
12 V
Internal resistance
maximal 10 mΩ at
-18 °C (-0.4 °F)
Effectivity: 915 i A Series
Edition 0/Rev. 0
Page 11
December 01 2017
Summary of Contents for 915 iS 3 A
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