How many GPU starts are allowed?

How many GPU starts are allowed?

• A. 2 starts
• B. 1 start
• C. 3 starts
• D. 4 starts

Answer: (B)

When you’re using a Ground Power Unit to start an engine, the key limit is the electrical load and energy margin available for a safe start. A GPU must deliver a large surge to initiate the engine, and sticking to a single external power start helps ensure the aircraft’s electrical system remains within safe margins and avoids voltage dips or other faults during the critical start sequence. After that first start, you should disconnect the GPU and rely on the airplane’s own power sources (APU or batteries) for any additional starts or operations. This minimizes risk to avionics, batteries, and the overall electrical system. If you need more starts, plan to switch to another power source rather than attempting multiple starts from the same GPU.

When you’re using a Ground Power Unit to start an engine, the key limit is the electrical load and energy margin available for a safe start. A GPU must deliver a large surge to initiate the engine, and sticking to a single external power start helps ensure the aircraft’s electrical system remains within safe margins and avoids voltage dips or other faults during the critical start sequence. After that first start, you should disconnect the GPU and rely on the airplane’s own power sources (APU or batteries) for any additional starts or operations. This minimizes risk to avionics, batteries, and the overall electrical system. If you need more starts, plan to switch to another power source rather than attempting multiple starts from the same GPU.