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Engine Start Panel
Dornier 328Jet - Ignition System
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Indications on EICAS MAIN Page
Dornier 328Jet - Ignition System
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Feb 11/02
EFFECTIVITY : ALL 12–74–01–00 Page 3
Indications/Messages on ENGINE Page
Dornier 328Jet - Ignition System
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Feb 11/02
EFFECTIVITY : ALL 12–74–01–00 Page 4
RMU Engine Backup Page
Dornier 328Jet - Ignition System
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IGNITION SYSTEM
GeneralThe ignition system is a dual channel ignition system, which gives a quick light–off capabilityover a wide temperature range. It is energized from the airplane 28 VDC electrical supply. Themain components of the system are:
– two ignition exciter units– two ignition cable assemblies– two spark igniters
The ignition system provides ground start, auto–relight and continuous ignition operations.Ground start and auto relight are controlled by the FADEC system (refer to 12–73–02–00),continuous ignition is set manually and overrides FADEC control.
Ignition Exciter UnitThe ignition exciter units transform the DC input to a pulsed high voltage output. The ignitionexciter units are mounted on the right–hand side of the bottom section of the outer bypass duct.
Ignition CablesThe ignition cable assemblies carry the high voltage output from the ignition exciters to theengine mounted spark igniters. They are connected between the ignition exciter unit and sparkigniter by coupling nuts. Each ignition cable assembly consists of an electrical lead encased in a flexible metal braiding.
Spark IgnitersTwo spark igniters, located at 4 and 5 o’clock positions respectively on the combustion chamberouter case, are screwed through bosses on the case to locate in the combustion chamber.When energized, they operate at a rate of four sparks (discharges) each seconds.
Ground Start OperationFor ground starts both ignitors can be manually selected by pushing the CONT IGN button.During a ground start, FADEC commands ignition by alternate selection of the igniters between5,2 % N2 and 40 % N2.
Auto–relight OperationAuto–relight is armed with weight off wheels. It is activated if the engine N2 decreases by morethan 2% below flight idle or if there is a flame–out. When it is activated the FADEC energizesrelays, which provide electrical power to the applicable ignition system and both ignitersoperate. Auto–relight is on, until the required thrust is attained, then the FADEC de–energizesthe relays to stop the igniters.
Dornier 328Jet - Ignition System
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TR 05 03
Continuous Ignition OperationContinuous ignition is selected manually via the IGN button on the ENGINE panel. It overridesFADEC control and operates both igniters at the same time. Continuous ignition is used fortakeoff and landing on contaminated runways and in adverse weather conditions. Fire ProtectionIf the ENG FIRE button is operated during a ground start or auto–relight ignition cycle, relaysopen to de–energize the igniters. If continous ignition is selected, when the FIRE button ispushed, the igniters will remain on until the IGN button is pushed again. IndicationsThe operating condition of the ignition system is indicated by captions in the IGN button asfollows:
– CONT and IG1 and IG2, continuous ignition selected,– IG1 and IG2, auto–relight active,– IG1 or IG2, ground start cyle, continous ignition not selected.
At the same time the blue status message IGN for the applicable engine is displayed on theEICAS MAIN and ENGINE pages and also on the RMU Backup Engine Page 1.
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Continuous Ignition OperationContinuous ignition is selected manually via the IGN button on the ENGINE panel. It overridesFADEC control and operates both igniters at the same time. Continuous ignition is used inadverse weather conditions and for engine relights above 35 000 ft, it is only available with theairplane weight–off–wheels. Fire ProtectionIf the ENG FIRE button is operated during a ground start or auto–relight ignition cycle, relaysopen to de–energize the igniters. If continous ignition is selected, when the FIRE button ispushed, the igniters will remain on until the IGN button is pushed again. IndicationsThe operating condition of the ignition system is indicated by captions in the IGN button asfollows:
– CONT and IG1 and IG2, continuous ignition selected,– IG1 and IG2, auto–relight active,– IG1 or IG2, ground start cyle.
At the same time the blue status message IGN for the applicable engine is displayed on theEICAS MAIN and ENGINE pages and also on the RMU Backup Engine Page 1.
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