After placing a generator offline in a dual-generator aircraft, what should you verify to confirm system stability?

After placing a generator offline in a dual-generator aircraft, what should you verify to confirm system stability?

• A. The engine RPM remains steady
• B. The standby bus is commanded offline
• C. The electrical system shows no thermal signs
• D. The other power sources maintain bus voltage within limits

Answer: (D)

When one generator is taken offline, the electrical load must be carried by the remaining sources without letting the system voltage wander. Verifying that the other power sources maintain bus voltage within specified limits shows the system can share the load properly and that voltage regulators and protective circuits are keeping the distribution stable. If the bus voltage stays within limits, you have evidence the electrical system remains healthy and capable of handling the reduced generation. Other indicators like engine RPM staying steady aren’t a direct measure of electrical stability, and turning the standby bus offline or watching for thermal signs don’t alone confirm stable operation. The key check is that bus voltage stays within the allowed range with one generator offline.

When one generator is taken offline, the electrical load must be carried by the remaining sources without letting the system voltage wander. Verifying that the other power sources maintain bus voltage within specified limits shows the system can share the load properly and that voltage regulators and protective circuits are keeping the distribution stable. If the bus voltage stays within limits, you have evidence the electrical system remains healthy and capable of handling the reduced generation.

Other indicators like engine RPM staying steady aren’t a direct measure of electrical stability, and turning the standby bus offline or watching for thermal signs don’t alone confirm stable operation. The key check is that bus voltage stays within the allowed range with one generator offline.