Pondrew said:
enuff_zed said:
changing the brake unit on a Tornado
Do they have disks all round? Or drums on the back?

:lol:
Multi-pistons set in a circle, acting on alternating discs of rotors and stators. The 'pads', if you want to call them that, are multiple sections, linked together like a jigsaw to make a circle.
The pistons compress the whole assembly, pushing from the inside, outwards. The stators are free to move in and out and all the various parts clamp up tight together when the brakes are applied.
The inside of the wheel has raised square sections which slot into corresponding cut outs running across the rotors. The stators do not protrude so far as obviously you don't want those fixed to the wheel.
To fit a wheel you first have to use a multi-pronged 'spider' to align all the brake pack components, then apply the brake to hold it all together while you slide the wheel on.
The brake units are only fitted on the main wheels.
As the brakes wear, the pads and stators become thinner, meaning the overall width of the assembly reduces. A pin is attached to the innermost row of pads and protrudes through a hole on the inner face. After every flight the pin was checked and when it became flush then the unit was replaced.
The Tornado has two separate hydraulic systems. Some major components were designed to use both systems (double piston actuators etc). This allowed for the failure of one system whilst still allowing control to be maintained.
The brakes were not deemed a vital component and were only operated from one system.
In the event of failure of that system, the Central Warning Panel would alert the pilot and on landing he would make greater use of aerodynamic braking, thrust reverse buckets and, if required, the arrestor hook which was on a simple torque tube to force it down when released.
I hope that has furthered your education a little. :wink: