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H. ignition/starting
ignition/starting 8
| Question | Answer |
|---|---|
| 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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