speeds. A mechanical lock-up is engaged before increasing to full power.

The gearbox has to be able to operate with interruptions to its oil supply of up to a minute while transferring full power through 90 degrees to the LiftFan.

The Three-Bearing Swivel Module has to both support the final hot thrust vectoring nozzle and transmit its thrust loads back to the engine mounts. The "fueldraulic" actuators for the 3BSM use fuel pressurised to 3500 lbf/in2, rather than hydraulic fluid, to reduce weight and complexity. One actuator

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