Question

Which of the following uses a monitoring system to check the function of channels?

(a) Matching triplex

(b) Monitored triplex

(c) Master triplex

(d) Major triplex

I have been asked this question by my college professor while I was bunking the class.

My question comes from Redundancy and Failure Survival in FBW topic in division Fly by Wire Flight Control of Avionics

Answer 1

The correct choice is (b) Monitored triplex

To explain: The incorporation of a monitoring system to check the correct functioning of a channel to a very high confidence level can also enable a failed channel to be identified and disconnected and this leads to an alternative failure survival configuration known as ‘monitored triplex’. A monitored triplex configuration comprises three totally independent parallel channels with each channel monitored by a dissimilar system to detect a failure.