Which igniter(s) is(are) used during a manual start?

During a manual start of an A320 engine, both igniters A and B are utilized to ensure a reliable ignition of the fuel-air mixture within the combustion chamber. The dual igniter configuration enhances the probability of successful engine start-up by providing redundancy; if one igniter does not function as expected, the other can still successfully ignite the engine.

Using both igniters also helps to quickly establish combustion, which is particularly important during the initial phases of starting when the engine is not yet producing significant thrust or airflow. This approach minimizes the risk of a failed start and ensures the engine is operational as intended.

The other choices do not reflect the correct starting procedure. Utilizing just one igniter may not achieve the same level of reliability and could lead to complications in the starting sequence. The term "Manual" alone is also not applicable, as it does not specify which ignition systems are operational during this phase. Thus, both igniter A and B being used is indeed the procedure for a manual start.