JAR 29.1165 Engine ignition systems
(a) Each battery ignition system must be
supplemented with a generator that is
automatically available as an alternate source of
electrical energy to allow continued engine
operation if any battery becomes depleted.
(b) The capacity of batteries and generators
must be large enough to meet the simultaneous
demands of the engine ignition system and the
greatest demands of any electrical system
components that draw from the same source.
(c) The design of the engine ignition system
must account for –
(1) The condition of an inoperative
generator;
(2) The condition of a completely
depleted battery with the generator running at
its normal operating speed; and
(3) The condition of a completely
depleted battery with the generator operating at
idling speed, if there is only one battery.
JAR 29.1143 (continued) JAR 29.1159 (continued)
SECTION 1 JAR–29
Reissued by Change 1 1–E–23 5.11.93
(d) Magneto ground wiring (for separate
ignition circuits) that lies on the engine side of
any firewall must be installed, located, or
protected, to minimise the probability of the
simultaneous failure of two or more wires as a
result of mechanical damage, electrical fault or
other cause.
(e) No ground wire for any engine may be
routed through a fire zone of another engine
unless each part of that wire within that zone is
fireproof.
(f) Each ignition system must be independent
of any electrical circuit that is not used for
assisting, controlling, or analysing the operation
of that system.
(g) There must be means to warn appropriate
crew members if the malfunctioning of any part of
the electrical system is causing the continuous
discharge of any battery necessary for engine
ignition.
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