Just a little off-topic in case anyone ever wondered about the difference between airplane parts and home-simulator parts. We did two 100% manual flights below RVSM airspace that day (no big deal) and on the return flight we brought the spare part with us. I had an idea of how expensive these things are but it’s still impressive. I’m sure most of you will find it interesting. The full flight simulators that we use to get our type rating and to conduct our recurrent training use these real airplane parts too which explains their multi-million dollar price tag too.
It’s interesting to know that when they installed the new part, the engineer who fitted it in was not an avionics guy. When that’s the case, even with the new part in the airplane stays unable to do CATIII dual channel approaches (no autoland). To bring it back up to CATIII capacity, a crew need to conduct an autoland in simulated CATIII conditions and register it in the tech log. It’s not uncommon for us to fly autolands in VMC conditions to stay current. If the engineer who fits the part is also an avionics guy, he can use a function to simulate an autoland right there on the ground (something I didn’t know was possible) and sign the airplane as CATIII.














