Final answer:
There are normally multiple igniters in an aircraft turbine engine, with the specific number depending on the engine design and size. One example is the General Electric GE90 engine used on the Boeing 777, which has 20 igniters.
Step-by-step explanation:
In an aircraft turbine engine, there are normally multiple igniters. The number of igniters can vary depending on the specific engine design and size. One common type of igniter used in turbine engines is the spark igniter, which creates an electric spark to ignite the fuel/air mixture in the engine.
For example, the General Electric GE90 engine, which is used on the Boeing 777, has 20 igniters. These igniters are located at various points in the engine to ensure proper and reliable ignition of the fuel/air mixture.
Having multiple igniters is important for safety and redundancy, as it helps to ensure that the engine can consistently start and operate even if one or more igniters fail.