Rotax 912 ULS 3 - Pre-Takeoff Procedures; Engine Warm-up and Safety; System Checks

Effectivity: 912 Serie BRP-Powertrain page 3-9
OM Edition 2 / Rev. 0 April 01/2010
d04675.fm
3.5) Prior to take-off
Safety
Warming up peri-
od
Throttle response
Ignition check Check the two ignition circuits at 4000 rpm (approx. 1700 rpm pro-
peller).
Propeller go-
vernor
Check of hydraulic propeller governor:
Check control of the hydraulic propeller governor to specifications
of the manufacturer.
NOTE: Cycling the propeller governor puts a relatively
high load on the engine. Unnecessary cycling or
additional checks should be avoided.

WARN
U

WARNING
Non-compliance can result in serious injuries
or death!
Do not take the engine into operation if any
person is near the aircraft.
Step Procedure
1 Start warming up period at approx. 2000 rpm for approx. 2
minutes.
2 Continue at 2500 rpm, duration depending on ambient
temperature, until oil temperature reaches 50 °C (120 °F).
3 Check temperatures and pressures.

WARNUN
G
NOTICE
After a full-load ground test allow a short coo-
ling run to prevent vapour formation in the cyl-
inder head.
Step Procedure
1 Short full throttle ground test (consult Aircraft Operators
Manual since engine speed depends on the propeller
used).
Step Procedure
1 Speed drop with only one ignition circuit must not exceed
300 rpm (approx. 130 rpm propeller).
2 115 rpm (approx. 50 rpm propeller) max. difference of
speed by use of either circuit, A or B.
NOTE:
The propeller speed depends on
the actual reduction ratio.