Book 3 - Ignition Systems Flashcards
before handling ignition system components, the associated circuit breaker must be ______ and/or the fuse removed. the LT input lead must be disconnected from the high energy _______ unit
THEN allow at least ___ minute to elapse before handling the ignition unit, HT lead or igniter plug
*_____ minutes for ___ gap type igniter plugs, commonly fitted to APU’s and small turboshaft engines
before handling ignition system components, the associated circuit breaker must be TRIPPED and/or the fuse removed. the LT input lead must be disconnected from the high energy IGNITION unit
THEN allow at least ONE minute to elapse before handling the ignition unit, HT lead or igniter plug
*THREE minutes for AIR gap type igniter plugs, commonly fitted to APU’s and small turboshaft engines
high _____ ignition is used for starting all jet engines and a ____ system is always used
two ignition units, two igniter plugs situated at _ and _ o clock
the HEIU delivers a nominal charge of __-__ joules (16 horsepower) over 50 milliseconds per spark. each unit will deliver ___ spark per second
dual rated units will deliver a lower charge during _________ ignition (2-4 joules) in order to extend the life of the igniter plugs
the charge is delivered between 18000 and 28000 volts
IT WILL KILL YOU
high ENERGY ignition is used for starting all jet engines and a DUAL system is always used
two ignition units, two igniter plugs situated at 4 and 7 o clock
the HEIU delivers a nominal charge of 12-13 joules (16 horsepower) over 50 milliseconds per spark. each unit will deliver 1 spark per second
dual rated units will deliver a lower charge during CONTINUOUS ignition (2-4 joules) in order to extend the life of the igniter plugs
the charge is delivered between 18000 and 28000 volts
IT WILL KILL YOU
the DC trembler HEIU is supplied with 28VDC
the operation of the trembler mechanism is smilier to an electric ____
the DC trembler HEIU is supplied with 28VDC
the operation of the trembler mechanism is smilier to an electric ____
the HT lead from the HEIU to the igniter plug is a highly ________ cable with a ________ sheathing around it.
the braiding is to stop outward interference
the HT lead from the HEIU to the igniter plug is a highly INSULATED cable with a BRAIDED sheathing around it.
the braiding is to stop outward interference
the most common form of igniter plug is the _______ discharge type
the discharge is a high energy flashover from the pellet to the body which projects a spark an ____ or more into the combustion chamber
the most common form of igniter plug is the SURFACE discharge type
the discharge is a high energy flashover from the pellet to the body which projects a spark an INCH or more into the combustion chamber
air gap igniters are fitted in ___’s or small GTE’s
the spark jumps a gap between the central electrode (cathode) and the outer electrode (anode) which is formed by the casing of the igniter
much _______ voltages required than for surface discharge
air gap igniters are fitted in APU’s or small GTE’s
the spark jumps a gap between the central electrode (cathode) and the outer electrode (anode) which is formed by the casing of the igniter
much HIGHER voltages required than for surface discharge
