How long can the auxiliary battery power standby instruments in an emergency?

• A. 15 minutes
• B. 20 minutes
• C. 30 minutes
• D. 45 minutes

Answer: (C)

The auxiliary battery is designed to provide a backup power source for standby instruments during an emergency situation. This capability is essential for maintaining critical flight information when the primary power source is compromised. In most aircraft systems, the auxiliary battery can sustain operations for approximately 30 minutes. This duration allows pilots enough time to respond to emergencies, such as engine failure or electrical system issues, and make necessary decisions for flight safety.

The specification of a 30-minute timeframe is built into the standard operational procedures for many aircraft, ensuring that essential instruments remain operational long enough for safe navigation and potential landing. This design consideration is primarily aimed at enhancing safety margins and providing adequate response time, which is crucial in flight operations.