On earlier A320s, the emergency generator operates only with:

The emergency generator on earlier models of the A320 is designed to automatically activate when the aircraft is in specific conditions critical for safety. One essential condition is that the landing gear must be retracted. This requirement helps ensure that the emergency power system operates effectively and provides necessary electrical power to essential systems during critical phases of flight, particularly when on approach or in level flight.

When the landing gear is retracted, the aircraft is typically in a configuration that suggests it is in the air, relying more heavily on electrical systems for navigation, communication, and flight instrumentation. This function is a safety feature designed to prioritize power management and ensure that critical systems have the necessary support when the aircraft needs it most.

The other conditions described do not align with the operational parameters of the emergency generator specifically on earlier A320 models. The operation of the generator is fundamentally linked to the gear position, reinforcing the rationale behind the correct choice.