During the automatic start sequence of ENG 1, you notice that only igniter A is powered. Is this normal?

During the automatic start sequence of ENG 1, you notice that only igniter A is powered. Is this normal?

• A. Yes, igniter B is only used for engine anti-ice.
• B. No, normally both igniters are used for all engine starts.
• C. Yes, igniter A is always used for ENG 1 start.
• D. Yes, igniters are used alternately for automatic engine start, in this case igniter A.

Answer: (D)

During the automatic start sequence of an engine, the A320 uses its igniters in an alternating fashion. This means that while both igniters (A and B) are available for use, only one igniter is powered at the outset of the start sequence to ignite the fuel-air mixture in the combustion chamber. The choice of which igniter is activated can vary with each start cycle, thus promoting the longevity of the igniters by distributing their usage evenly. In the scenario where only igniter A is powered during the start of ENG 1, it aligns with this operational principle. The system alternates between igniter A and igniter B for efficiency and reliability purposes. Hence, it is entirely normal for only one igniter to be utilized during a specific start sequence, confirming that igniter A being activated is consistent with the intended operation of the engine start procedure.

During the automatic start sequence of an engine, the A320 uses its igniters in an alternating fashion. This means that while both igniters (A and B) are available for use, only one igniter is powered at the outset of the start sequence to ignite the fuel-air mixture in the combustion chamber. The choice of which igniter is activated can vary with each start cycle, thus promoting the longevity of the igniters by distributing their usage evenly.

In the scenario where only igniter A is powered during the start of ENG 1, it aligns with this operational principle. The system alternates between igniter A and igniter B for efficiency and reliability purposes. Hence, it is entirely normal for only one igniter to be utilized during a specific start sequence, confirming that igniter A being activated is consistent with the intended operation of the engine start procedure.