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H. ignition/starting

ignition/starting 8

how can the remaining life of starter-generator brushes be determined? by visually inspecting the amount of wear groove remaining on the brushes.
what components of the starter-generator require periodic inspection?(2) both commutator and brushes should be inspected for wear beyond operational limits.
between field and armature windings in starter-generators, which ordinarily receive current for operation in start mode? generally, both field and armature receive current for operation in the start mode.
what are possible sources of low pressure compressed air used for starting jet transport aircraft equipped with air turbine starters?(3) a ground power unit(GPU), an on-board auxiliary power unit (APU), compressed bleed air from an already running engine.
when should ignition ideally occur?(reciprocating question) a specific number of degrees( as determined by the manufacturer) before the piston reaches top dead center on the compression stroke.
why are dual magnetos used in the engine ignition system?(2) to improve combustion efficiency, and provide redundancy for safety.
why is magneto timing so important? for an engine to function properly the sparkplug must fire at a specific time. to produce the required energy for the spark at the required time, the magneto must be in the E-gap postion(properly timed).
what function does a magneto perform? it produces a high voltage that forces a spark to arc across a spark plug gap.
name the components of a high tension magneto system.(3) a permanent multipole rotating magnet, soft iron core, and pole shoes.
name the three main circuits of a high tension magneto system. magnetic, primary, secondary.
what is an E-gap angle? it is a point a few degrees beyond the neutral position of a rotating magnet where maximum magnetic field stress exists.
what reduces arcing in the points and also aids the collapsing of the magnetic field in a magneto? a capacitor.
how does a magneto produce the high voltage required to fire a spark plug? when the magnetic rotor is in the E-gap position the points are open.
what is the P-lead and how does it function? it connects the ignition switch to the primary circuit of the magnetos.
what is a magneto timing light used for, and what does it indicate? it is used for both internal magneto timing and magneto-to-engine timing, and indicates the exact instant the magneto points open.
why are turbine engine igniters generally not susceptible to carbon fowling? because the high energy sparks they produce clean off any deposits on the firing end.
what is the function of a duty cycle in relation to a turbine engine ignition system? a duty cycle allows the operation of the ignition system for a given time, and is then followed by a minimum specified cooling down period.
what are the three components of a turbine engine ignition system?(3) ignition exciters, high tension leads, igniters.
Created by: Justin84
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