If Battery O'TEMP CAS triggers, which operation is prohibited?

If Battery O'TEMP CAS triggers, which operation is prohibited?

• A. Takeoff is prohibited, regardless if message clears.
• B. Landing is prohibited, regardless if message clears.
• C. Taxi is prohibited.
• D. Circling approaches only.

Answer: (A)

Battery O'TEMP CAS means the battery temperature is outside safe limits. When you’re about to take off, the aircraft relies on the battery to supply power for critical systems and for engine starts, and the high current draw of takeoff can push an already overheated battery into a dangerous condition. To prevent possible electrical failure or a thermal event exactly when you need maximum power and system reliability, procedures prohibit initiating a takeoff if Battery O'TEMP CAS is active, even if the warning clears later. The safety-first approach is to delay takeoff until the battery temperature is back within safe limits or after a maintenance check confirms it's safe. Taxi can be permissible because it involves low-power operations, and the issue is specifically about high-load takeoff. Landing or circling approaches aren’t restricted by this single caution in the same way, so the emphasis here is on not starting the takeoff.

Battery O'TEMP CAS means the battery temperature is outside safe limits. When you’re about to take off, the aircraft relies on the battery to supply power for critical systems and for engine starts, and the high current draw of takeoff can push an already overheated battery into a dangerous condition. To prevent possible electrical failure or a thermal event exactly when you need maximum power and system reliability, procedures prohibit initiating a takeoff if Battery O'TEMP CAS is active, even if the warning clears later. The safety-first approach is to delay takeoff until the battery temperature is back within safe limits or after a maintenance check confirms it's safe.

Taxi can be permissible because it involves low-power operations, and the issue is specifically about high-load takeoff. Landing or circling approaches aren’t restricted by this single caution in the same way, so the emphasis here is on not starting the takeoff.