ULPOWER UL350 Operating Manual
Also see for UL260: Operating manual
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Contents
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Operating Manual ULPOWER UL260,UL350,UL390,UL520M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 21 of 22Relative fuel pressure deviates from normal WARNING: Verify that fuel level and battery voltage are sufficient (min 12 VDC), and that theelectrical system is working properly. If battery voltage is running low, switch offunnecessary electrical consumers. Carry out emergency/precautionary landing.Note: A change in relative fuel pressure influences the air-fuel mixture. If pressure drops, themixture becomes too lean; if pressure rises, the mixture becomes to rich. Any deviation inthe correct air-fuel ratio can influence the power output of the engine. Attention: A too lean fuel mixture can cause knocking, and severe damage to the engine.While the engine is not running (ignition off, but master switch and fuel pump on) the sameproblems should show.On the ground, check fuel or electrical system for possible cause. Replace filter(s), pump(s), lines,pressure regulator or sensor as necessary.Test the fuel system with ignition off and master switch and fuel pump on.Single CHT and/or EGT dropVerify that both CHT and EGT of the same cylinder have dropped. If not, CHT or EGT probe or signalintake have a malfunction. Correct before next flight. WARNING: A large deviation of both CHT and EGT temperatures in one cylinder, whencompared to the others, indicates that the particular cylinder is not firing properlyor is not firing at all. Engine delivers reduced power. Carry outemergency/precautionary landing.If it is not a sensor malfunction, send the engine to a ULPower authorised service-centre forinspection/overhaul.KnockingReduce engine power setting to the minimum needed and keep engine temperatures well below themaximum. WARNING: Carry out emergency/precautionary landing.Be sure the right fuel type and octane rating have been used.Low battery voltageSwitch off all unnecessary electrical consumers, as the engine needs battery to operate. WARNING: Carry out emergency/precautionary landing.To reduce electrical power consumption in flight even more, one ignition system can be turned off.Keep in mind that ignition backup system is not operating at that time, but in the event of anemergency, can be manually selected by switching second ignition system back on and switchingfirst off.On the ground, have generator, battery and electrical systems checked for any malfunction. Verifythat no more than 15 Amps are being used by electrical devices other than the engine and fuelpump. |
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