In the accessory section, where are gearboxes normally located?

In the accessory section, where are gearboxes normally located?

• A. Near the top of the compressor
• B. Near the bottom of the compressor
• C. Inside the combustion chamber
• D. At the tailpipe

Answer: (B)

Gearboxes in the accessory drive are part of powering the engine’s helpers like fuel pumps, oil pumps, and generators, and they’re driven from the core. Their usual placement at the bottom of the compressor is intentional because gravity aids oil drainage and return to the sump, keeping lubrication reliable and clean. It also makes inspection and maintenance easier since the bottom area is typically more accessible on most engine installations. Placing the gearbox elsewhere would complicate drainage and lubrication paths and would expose the drive to heat or exhaust in ways that aren’t practical. So they’re located near the bottom of the compressor.

Gearboxes in the accessory drive are part of powering the engine’s helpers like fuel pumps, oil pumps, and generators, and they’re driven from the core. Their usual placement at the bottom of the compressor is intentional because gravity aids oil drainage and return to the sump, keeping lubrication reliable and clean. It also makes inspection and maintenance easier since the bottom area is typically more accessible on most engine installations. Placing the gearbox elsewhere would complicate drainage and lubrication paths and would expose the drive to heat or exhaust in ways that aren’t practical. So they’re located near the bottom of the compressor.