Where is the tail gearbox located?

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Multiple Choice

Where is the tail gearbox located?

Explanation:
The tail gearbox is located at the top of the tail pylons. Placing it there keeps the unit right in line with the tail rotor drive, where a bevel gear arrangement can turn the drive from the main shaft 90 degrees to the tail rotor and reduce RPM for proper tail-rotor speed. The tail rotor head is driven by the gearbox output and attached to the tail rotor shaft, so it’s not the gearbox’s mounting point. The other options describe what the gearbox does (changing drive angle or reducing RPM) rather than where it sits.

The tail gearbox is located at the top of the tail pylons. Placing it there keeps the unit right in line with the tail rotor drive, where a bevel gear arrangement can turn the drive from the main shaft 90 degrees to the tail rotor and reduce RPM for proper tail-rotor speed. The tail rotor head is driven by the gearbox output and attached to the tail rotor shaft, so it’s not the gearbox’s mounting point. The other options describe what the gearbox does (changing drive angle or reducing RPM) rather than where it sits.

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