I had a question on a School Test the other day which I cannot really motivate the answer to (I am actually the teacher).
59. Aircraft equipped with power brake systems usually have an emergency brake system. How is the emergency system activated?
a) Manually by controls in the cockpit
b) The system is automatically activated in the event of main hydraulic system failure system failure
c) Automatically if the anti skid system fails
d) Automatically up on landing when spoilers are deployed and nose wheel on the ground
The Question Bank claims a) to be the correct answer. I have searched the internet for info. about different aircraft braking system. I've seen both the 737 and A320 has an automatic switching of hyd. system if the primary should fail. Alternate braking in general, is it usually as simple as a shuttle valve which senses low pressure in the primary system and change source to the alternate system?
Then on the other hand, I've heard the A340 has this button "Alternate Braking" in the cockpit. What is it for?
