Rotax 915 i A series Maintenance Manual page 301

SYSTEM DESCRIPTION
The ignition unit operates with four double ignition
coils with double ignition. If the LANE selector
switchs are both ON, the active LANE controls all
four double ignition coils which are connected to the
eight spark plugs. In normal Dual LANE Mode (both
ON), both spark plugs ignite each cylinder at the
same time. In LANE A or LANE B Mode, only one
spark plug ignites per cylinder (one LANE switched
OFF).
The ignition unit does not require an external power
supply.
FIRING ORDER
1–4–2–3
INTERNAL GENERATORS A AND B
In normal operation generator A is supplying the dou-
ble ignition coils via the fuse box. Generator B
charges the battery via the fuse box.
When engine is started at first generator B supplies
the double ignition coils. If throttle is opened and en-
gine revs more than 2700 rpm for a few seconds, the
fuse box switches to generator A to supply the dou-
ble ignition coils and generator B starts charging the
battery.
If more electric energy for the non-engine consumers
of the aircraft is needed, an external generator (op-
tional available) can be used.
SAFETY INSTRUCTION
m WARNING
Follow the general safety instructions during
all work on the engine and the assemblies
around it. See section Introduction.
Effectivity: 915 i A Series
Edition 0/Rev. 0
BRP-Rotax
MAINTENANCE MANUAL HEAVY
74–00–00
Page 3
August 01 2018