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Hetfeild
Any chance you could give the airbus type so a manual or notes can be consulted to give you an answer. Seeing pressure on the triple indicator means for some reason the alternate brake system was doing the braking. Not the primary. At the time I may have suggested bring the aircraft to a stop parking the brakes and selecting the Antiskid/ NWS off then on(cycling the BSCU) probably would have been a useful thing to do from a trouble shooting stand point and may have solved the problem. Being towed back to blox seems extreme but I was not there, So now its history.. |
@Bolty
A300 but afaik not much different to 320/340 beside the twisted yellow/blue hyd-system. |
Bolty,The triple indicator also shows parking brake pressure !
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The triple indicator also shows parking brake pressure ! |
Hetfield,
I would suggest that you did know what happened. The Normal brakes had failed. As indicated there were no other indications to suggest any further failures. In fact, from you account, the Alternate brakes system was fully functional. Alternate brakes is not a lesser system and is as effective as Normal brakes. |
If this was a A345/6, at the gate, the alternate braking is controlled by the EBCU which regulates the pressure to 1000psi, which is normal to see.
Alternate braking is active when GRN pressure is insufficient provided that BLU pressure is available, A/SKID & N/W STRG switch is on and parking brake is not on. Auto switching from GRN to BLU systems is provided. BLU pressure indication to both left and right brake and accumulator pressure is provided. Autobrake is inop, A/SKID is operative. Alternate braking without A/SKID should not exceed 1000 PSI on the triple indicator. A346 pressure is auto-limited to 1000psi. A Nov 2000 telex from AI seeks to highlight the different "feel" of the braking system with the BRAKES ANTI-SKID FAULT ECAM message: basically with this message there is no anti-skid available and braking is only through the alternate braking system. When braking is applied on the alternate braking system the brake response is higher than on the normal braking system. This is particularly marked for small brake pedal deflections. Pure accumulator operation provides seven full brake applications. The parking brake is supplied by BLU pressure and is only on when it's ON! The BLU electrical pump may be used. Activation of the Parking Brake deactivates ALL other braking modes. |
@Conan the Barber
The Normal brakes had failed. I'm afraid I'm not the top bunk who knows everything about the complex systems behind AB. |
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