Engine driven power units shall have what done prior to connecting or disconnecting external power cables to the aircraft?

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Study for the Avionics Electrical Technician First Class (AET1) SWE Test. Engage with flashcards, multiple-choice questions, and detailed explanations. Prepare with confidence for your upcoming exam!

Multiple Choice

Engine driven power units shall have what done prior to connecting or disconnecting external power cables to the aircraft?

Explanation:
Shut down the engine driven power unit before connecting or disconnecting external power cables. When the EDPU is running, the cables are energized and can cause dangerous arcing, electric shock, or backfeeding into the aircraft’s electrical bus or generator. Turning it off puts the system in a safe, de-energized state for making or breaking connections, protecting both personnel and equipment and ensuring proper power transfer when you re-energize per procedure.

Shut down the engine driven power unit before connecting or disconnecting external power cables. When the EDPU is running, the cables are energized and can cause dangerous arcing, electric shock, or backfeeding into the aircraft’s electrical bus or generator. Turning it off puts the system in a safe, de-energized state for making or breaking connections, protecting both personnel and equipment and ensuring proper power transfer when you re-energize per procedure.

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