Anti-windmill brake

The Problem

  • Even when shutdown, gas turbines continue to suffer serious damage.
  • The slow rotational speed associated with windmilling is insufficient to generate the centrifugal force required to prevent blade chatter.
  • Prolonged periods of windmilling can destroy turbine blading.
  • Windmill damage can cost upwards of £0.25M to repair.

The Solution

Designed to compliment the Posiflow retrofit programme, TCL have developed an Anti-Windmill Brake. It fits in place of the HP fuel pump and uses a solenoid operated disk brake to apply sufficient decelerating torque to stop the windmilling gas generator. Systems are included to prevent brake application whilst the engine is fired.

Phonic wheel mounted brake

TCL have now developped an anti-windmill brake that can be fitted in place of the geared phonic wheel which is used for speed measurement. This brake does not require the removal of the HP fuel pump and so can be fitted in isolation, without a Posiflow full fuel system modification. For more details see:- Phonic Wheel Mounted Anti-Windmill Brake for Rolls Royce Avon


Below you will find a video, this video allows you to hear the turbine blade clatter that occurs during windmilling while the gas turbine is shut down. This will be prevented if fitted with an Anti-WindMill Brake.

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