A turboprop aircraft has two attitude gyros, driven from independent electrical sources. On a six-hour fight, assume

Question:

A turboprop aircraft has two attitude gyros, driven from independent electrical sources. On a six-hour fight, assume the probability of failure of each attitude gyroscope is 0.0008. Does this achieve " five-nines" reliability (i.e., a probability of at least 0.99999 that not all gyros will fail)?