I'm about a quarter of a way through my Computer Based Training, and I'm getting more and more excited. I can't believe that in 6 weeks I'm going to be back flying the line. I haven't forgotten as much as I was afraid of and as little things come back to me I get this thrill of "oh yeah! I remember this! I can't wait to do this with the real airplane again!"
Last night I studied the Electronic Information System (EIS) and the Auxiliary Power Unit (APU). The EIS contains all the screens in the cockpit that we receive information on. In the A320 there are 4 screens.
The pair on the left are the captain's PFD (primary flight display) and ND (navigation display). On the right side are the first officer's PFD and ND. The two screens in the middle are the engine and warning display (E/WD) and the systems display (SD). Almost all the information we need in flight are on these 6 screens. You can use a control panel to change the system you view on the SD. It's one of the reasons I love the Airbus -- everything is presented in such a clear fashion.
The APU is what normally provides power and air conditioning when the engines aren't running. More commonly now we use external power and air for these functions as the APU burns fuel. It's basically a small jet engine mounted in the tail. It's geared into a generator that provides enough power for important systems while on the ground. It also provides the electricity and air needed to start the first engine. If you've ever been on a flight where the crew had to start an engine at the gate, this was probably because the APU was inoperative. I have had this happen a few times. I don't like flying without one because you've effectively lost a backup generator in case you have an engine failure. However, a broken APU isn't a good enough reason to cancel a flight!
Tonight's topics: the electrical, fire detection and GPS navigation systems. I'm so happy that I may do another section tonight. I love learning aircraft systems and I love this airplane! I can't wait to fly one again.