aircraft ignition system

1. Aircraft Ignition system
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2. Ignition system
 An ignition system is a system used for
igniting a fuel-air mixture
 The function of the ignition system is to
provide an electrical spark to ignite the
fuel/air mixture in the cylinders.
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3.  The ignition system of the
engine is completely separate
from the airplane's electrical
system.
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4. VARIOUS COMPONENTS OF
IGNITION SYSTEM
 IGNITION SWITCH
 MAGNETO
 DISTRIBUTOR
 TRANSFORMER
 SPARK PLUG
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5. BATTERY IGNITION SYSTEM:
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6. Few aircraft and most automobiles
use a battery ignition system which
has a battery or Generator rather
than a magneto as its source of
energy.
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7.  In battery ignition system, a
cam is driven by the engine
opens a set of points to
interrupt the flow of current in
primary circuit
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8. The magnetic field induces a high
voltage in the secondary of the ignition
coil, which is directed by a distributor
to the proper cylinder.
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9.  MAGNETO IGNITION SYSTEM
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10. The magneto type ignition system is used on
most reciprocating aircraft engines.
Magnetos are engine driven self-contained
units supplying electrical current without
using an external source of current.
However, before they can produce current
the magnetos must be actuated as the engine
crankshaft is rotated by some other means.
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11.  It is superior to battery ignition because produces
a hotter spark at high engine speeds
 It is self contained unit, not dependent on any
external source of electrical energy
 It produces a high voltage in spark plug gap in
each cylinder
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13.  Modern airplane engines are required by to have a
dual ignition system
 Two separate magnetos to supply the electric current
to the two spark plugs contained in each cylinder.
 One magneto system supplies the current to one set of
plugs; the second magneto system supplies the
current to the other set of plugs. For that reason the
ignition switch has four positions:
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14.  OFF, L, R, and BOTH With the switch in the
"L" or "R" position.
 only one magneto is supplying current and
only one set of spark plugs in each cylinder is
firing.
 With the switch in the BOTH position, both
magnetos are supplying current and both spark
plugs are firing.
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15. SPARK PLUG
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16.  PURPOSE IS TO CONDUCT
A SHORT IMPULSE OF
HIGH VOLTAGE THROUGH
THE WALL OF THE
COMBUSTION CHAMBER
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17. MAIN COMPONENTS ARE
 OUTER SHELL
 INSULATOR
 ELECTRODE
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9/1/2023 SNS COLLEGE OF TECHNOLOGY

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