Book 3 - Ignition Systems Flashcards Preview

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Flashcards in Book 3 - Ignition Systems Deck (6)
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1
Q

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

A

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

2
Q

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

A

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

3
Q

the DC trembler HEIU is supplied with 28VDC

the operation of the trembler mechanism is smilier to an electric ____

A

the DC trembler HEIU is supplied with 28VDC

the operation of the trembler mechanism is smilier to an electric ____

4
Q

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

A

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

5
Q

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

A

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

6
Q

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

A

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