What are the amp and voltage limits for a battery start?

The specifications for a battery start typically set the minimum voltage and maximum load in terms of amperage to ensure the engine starts efficiently without overloading the battery or causing damage to the electrical system. The correct answer indicates a minimum voltage of -22 VDC, which is generally necessary to provide sufficient power for the systems to function properly during the starting process.

The maximum load of 150 A before starting the other engine reflects a safe threshold that allows adequate starting power while preventing excessive drain on the battery. This helps to maintain battery health and ensures reliability during starting. Exceeding this amperage can cause excessive heat and damage to the battery or starter system.

Knowing these limits is essential for aircraft mechanics and pilots to ensure a successful and safe engine start, especially in multiple-engine configurations where load management is critical. Understanding these parameters also helps in troubleshooting starting issues and maintaining optimal performance of the engine's electrical system.