How many transformer rectifier units supply DC power?

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Multiple Choice

How many transformer rectifier units supply DC power?

Explanation:
Four transformer rectifier units supply DC power. These units convert AC from the aircraft’s generators into 28V DC and feed the DC buses that power avionics and essential systems. Having four TRUs allows the load to be shared across units and provides redundancy so the DC power remains available even if one unit isn’t operating. This setup balances sufficient capacity with reliability, rather than risking under‑provisioning (fewer units) or adding unnecessary complexity (more units).

Four transformer rectifier units supply DC power. These units convert AC from the aircraft’s generators into 28V DC and feed the DC buses that power avionics and essential systems. Having four TRUs allows the load to be shared across units and provides redundancy so the DC power remains available even if one unit isn’t operating. This setup balances sufficient capacity with reliability, rather than risking under‑provisioning (fewer units) or adding unnecessary complexity (more units).

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