Operating Manual
UL
POWER
UL
260,
UL
350,
UL
390,
UL
520
M0310: OM 260 - 520A01 Revision No: 04
Date:
2021-11-18
Page:
20
of
23
Exceeding of max. admissible cylinder head temperature
Reduce engine power setting to the required minimum and verify that CHT drops. Continue normal
flight if the CHT drops 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 into the logbook, stating duration and
extent of over-temperature condition.
On the ground, verify that cooling ducts are still in place and air is free to flow over and through
cylinder head cooling fins. If problem remains, the engine should be sent for inspection/overhaul to
a ULPower authorised service-centre.
Exceeding of max. admissible oil temperature
Reduce engine power setting to the required minimum and verify that oil temperature drops.
Continue normal flight if the oil temperature drops within temperature limits.
WARNING
: If temperature does not drop, carry out emergency/precautionary landing.
Any exceeding of the max. admissible oil temperature has to be entered into the logbook, stating
duration and extent of over-temperature condition.
On the ground, verify that oil level is sufficient and air is free to flow through oil cooler. If problem
remains, the engine should be sent for inspection/overhaul to a ULPower authorised service-centre.
Oil pressure below minimum
WARNING
: Oil pressure should be above minimum at all times. If not, shut down the engine
immediately or as soon as possible.
In flight, reduce engine power setting and speed to the required minimum and carry out
emergency/precautionary landing.
Any loss of pressure below the minimum required oil pressure has to be entered into the logbook,
stating duration and extent of under-pressure condition.
On the ground, verify that oil level is sufficient and that no oil leaks are present. Check that oil
lines to and from the oil cooler are not twisted/blocked or leaking. If oil cooler and oil lines are not
blocked, oil filter should be inspected and changed. If problem remains, the engine should be sent
for inspection/overhaul to a ULPower authorised service-centre.
Exceeding of max. admissible oil pressure
WARNING
: Oil pressure should be below the maximum at all times. If not, shut down the engine
immediately or as soon as possible.
Note:
At cold start, the oil pressure could be higher for several minutes as the oil is still cold and
not as liquid, resulting in a higher pressure. Nevertheless, the maximum pressures of both
warm and cold engines should not be exceeded as it indicates a problem with the pressure
relief valve or oil lines/galleries and thus no/improper lubrication.
Any exceeding of the max. admissible oil pressure has to be entered into the logbook, stating
duration and extent of over-pressure condition.
On the ground, verify the oil level. Check pressure relief valve. If problem remains, the engine
should be sent to a ULPower authorised service-centre for inspection/overhaul.
