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CGCampbell
CGCampbell
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Here is oneOne example of a system thathat cannot be switched off by the pilot that is probably more common thatto all other airframes than just the one airframe I'm indicating.

Whenever electrical power is applied to oura Gulfstream G550, whether it is powered by battery, generators, an apu, or some external pwrpower source, the engine FADEC'seach engine's FADEC Electronic Engine Control computer (EEC) computer will be powered and the pilot can not switch them off.

The pilot would have tocould only indirectly swithturns them off by switching off all power sources.

However, when the engines are running, he can't even do that since there is an engine driven-driven generator dedicated to powering the EECs in the event of alla total power lossesloss.

In fact, while the engine is running or even windmilling above 35% rpm, the EEC's dedicated generator is supplingsupplying all power to the EEC and there is no switch or circuit protection that can be manipulated by the pilot to interupt power to the EECinterrupt it.

Here is one example of a system tha cannot be switched off by the pilot that is probably more common that just the airframe I'm indicating.

Whenever electrical power is applied to our Gulfstream G550, whether it is powered by battery, generators, apu, external pwr, the engine FADEC's Electronic Engine Control computer (EEC) will be powered and the pilot can not switch them off.

The pilot would have to indirectly swith them off by switching off all power sources.

However, when the engines are running, he can't even do that since there is an engine driven generator dedicated to powering the EECs in the event of all power losses.

In fact, while the engine is running or windmilling above 35% rpm, the EEC's dedicated generator is suppling all power to the EEC and there is no switch or circuit protection that can be manipulated by the pilot to interupt power to the EEC.

One example of a system that cannot be switched off by the pilot that is probably more common to all other airframes than just the one airframe I'm indicating.

Whenever electrical power is applied to a Gulfstream G550, whether it is powered by battery, generators, an apu, or some external power source, each engine's FADEC Electronic Engine Control (EEC) computer will be powered and the pilot can not switch them off.

The pilot could only indirectly turns them off by switching off all power sources.

However, when the engines are running, he can't even do that since there is an engine-driven generator dedicated to powering the EECs in the event of a total power loss.

In fact, while the engine is running or even windmilling above 35% rpm, the EEC's dedicated generator is supplying all power to the EEC and there is no switch or circuit protection that can be manipulated by the pilot to interrupt it.

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Steve H
Steve H
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Here is one example of a system tha cannot be switched off by the pilot that is probably more common that just the airframe I'm indicating.

Whenever electrical power is applied to our Gulfstream G550, whether it is powered by battery, generators, apu, external pwr, the engine FADEC's Electronic Engine Control computer (EEC) will be powered and the pilot can not switch them off.

The pilot would have to indirectly swith them off by switching off all power sources.

However, when the engines are running, he can't even do that since there is an engine driven generator dedicated to powering the EECs in the event of all power losses.

In fact, while the engine is running or windmilling above 35% rpm, the EEC's dedicated generator is suppling all power to the EEC and there is no switch or circuit protection that can be manipulated by the pilot to interupt power to the EEC.