Final answer:
If a failure warning occurs when turning on the battery in an aircraft, one must consult the operating manual, possibly involve a maintenance technician, and resolve the issue prior to takeoff. Safety is paramount, and taking off with unresolved warnings is typically against aviation regulations and unsafe.
Step-by-step explanation:
If you get a failure warning when you turn on the battery, it is critical to address this issue before proceeding with any flight operations. First, identify the nature and severity of the warning. Consult the aircraft's operating manual to understand the implications of the warning and to follow the appropriate troubleshooting steps. In aviation, safety is paramount. If the warning indicates a problem that could affect the aircraft's performance or safety, you must resolve the issue on the ground; taking off with unresolved warnings can lead to serious safety risks.
It is also essential to confer with a qualified aircraft maintenance technician to diagnose and repair the fault. Every failure mode has its own set of protocols, and it's crucial that they are strictly adhered to. In most cases, taking off with an unresolved failure warning is not allowed and goes against aviation safety regulations. Only when the problem has been fully diagnosed and corrected, and the aircraft's systems are confirmed to be functioning normally, should a takeoff be considered.