I'm not sure that ALL 321s had the 'better' RAT as standard from production. If memory serves correctly we had an early one that was modified to the later standard on arrival with us from the original operator.
What I am sure of though is that when I look at the overhead circuit breaker panel and there are yellow collared c/bs present then I have a 'old' RAT a/c.
Interested to hear that the later RAT has a variable pitch propellor though. How did the early system maintain 3000psi when at high speed I wonder?
