Operating Manual ULPOWER UL260i UL260iF UL260iS UL260iSA
MO 260A01 Revision No: 6 Date: 2014-09-15 Page: 20 of 22
Abnormal operation
WARNING: At unusual engine behaviour, follow the guidelines below and perform the necessary
maintenance and/or checks before next flight. All problems and carried out
maintenance/repairs/replacements should be noted in the engine logbook.
Abnormal running on ignition check
When one ignition coil is switched off and the engine runs differently than with both coils switched
on, there are multiple causes possible. Depending on the amount of cylinders that stop firing
verify/replace the following corresponding to the ignition coil that was not switched off:
one cylinder: check ignition lead and sparkplug of the corresponding cylinder and coil.
two cylinders: check ignition coil, it's connection or wiring loom from ECU to the coil.
all cylinders: check ignition coil, it's connection or wiring loom from ECU to the coil.
Attention: Engine needs only one ignition system to function properly. The second system is
used as an emergency backup. Operating the engine on one ignition system only
reduces redundancy/safety, not the power output.
Sudden engine stop
WARNING: If prior to sudden engine stoppage no abnormal noise indicated internal damage to
the engine, try to restart the engine, otherwise conduct power-off emergency
landing.
Before restarting the engine, check the following:
sufficient fuel level
open fuel tap
master and ignition switch on
fuel pump switched on
fuel pressure
electrical system working
sufficient battery voltage (eventually switch off all non-necessary electrical consumers)
In the event the engine did not restart, or abnormal noise indicated possible internal damage to the
engine, perform the daily/pre-flight checks (as stated before) carefully to pinpoint the problem.
Check fuel for eventual contamination. Rectify the problem if possible or send the engine for
inspection/overhaul to a ULPower authorised service-centre.
Any sudden engine stop should be entered into the logbook, stating the possible reason.
Nearing maximum engine speed
Engine is equipped with an electronic rpm limiter. When reaching maximum engine rpm, the engine
will seem to hold back and slightly sputter. Throttle back to reduce engine speed.
Exceeding of max. admissible cylinder head temperature
Reduce engine power setting to the minimum necessary and verify that CHT drops. Continue normal
flight within the temperature limits.
WARNING: If temperature does not drop, carry out emergency/precautionary landing.
Any exceeding of the max. admissible CHT has to be entered by the pilot into the logbook, stating
duration and extent of over-temperature condition.
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