precautions. However, severely damaged
units that have been broken open must be
handled with forceps or gloves and disposed
of in accordance with AR 75515.
Figure 2.15. Wiring Schematic of Typical Ignition Unit.
2.23.
IGNITERS
Gas turbine igniters come in many sizes and shapes depending
upon the duty they will be subjected to. The electrodes of the plugs
used with highenergy ignition systems must be able to accommodate a
current of much higher energy than the electrodes of conventional
spark plugs are capable of handling. Although the highenergy
current causes more rapid igniterelectrode erosion than that
encountered in reciprocatingengine spark plugs, this is not a major
disadvantage, because of the relatively short time that the ignition
system is in operation. Most igniter plugs used in turbine engines
are of the annulargap type, shown in figure 2.16.
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