Rotax OM-912, Operator'S Manual

Page: 45 / 64

Effectivity: 912 Serie BRP-Rotax page 10 - 15
OM Edition 1 / Rev. 1 Febr. 01/2008
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10.3.3) Pre-flight checks
▲
WARNING: Ignition "OFF" Before cranking the propeller
switch off both ignition circuits and anchor the
aircraft. Have the cockpit occupied by a compe-
tent person.
Operating media:
▲
WARNING: Carry out pre-flight checks on the cold or luke
warm engine only!
Risk of burning and
scalds.
Check for any oil-, coolant- and fuel leaks.
If leaks are evident, rectify before flight.
■
CAUTION: The coolant specifications of the section 10.2)
Operating media are to be observed.
- Verify coolant level in the overflow bottle , replenish as required
up to top.
The coolant level must be between min. and max. mark or at
least 0.2 litre (0.4 liq pt).
■
CAUTION: The oiI specifications of the section 10.2) Oper-
ating media are to be observed.
- Check oil level and replenish as required.
◆
NOTE: Propeller shouldn't be turned reverse the nor-
mal direction of engine rotation.
- Prior to oil check, turn the propeller by hand in direction of engine
rotation several times to pump oil from the engine into the oil
tank, or let the engine idle for 1 minute.
It is essential to build up compression in the combustion cham-
ber. Maintain the pressure for a few seconds to let the gas flow
via the piston rings into the crankcase. The speed of rotation is
not important as the pressure and the amount of gas which is
transfered into the crankcase.
This process is finished when air is returning back to the oil tank
and can be noticed by a murmur from the open oil tank.
◆
NOTE: The oil level should be in the upper half (be-
tween the “50%“ and the “max“ mark) and
should never falls below the “min“ mark. Prior to
long flights oil should be added so that the oil
level reaches the “max“ mark.
Avoid oil levels exceeding the “max“ mark, since excess oil could
be poured out through the venting system.
Difference between max.- and min.- mark = 0,45 litre (0.95 liq pt)