Blackhawk
Well-Known Member
Agree. Also, differences in how autopilots behave, such as GFC700 vs. KAP-140. Also, differences in how autopilots behave during failures of certain systems. During a vacuum system failure the KAP-140 will still work in many modes.Agree. Also, when used properly, the autopilot can be used as an effective aide to learning basic attitude flying-the student can see the size of the corrections used by the autopilot to follow a course. They can also learn from the autopilot when it does not work well-such as the needle chasing that your average KrAP140 does in the last 200' of an ILS.
An example from a war story. During jet training I was given a scenario in the sim where I was given the maintenance can indicated the airplane was just washed. Just after taking off into 200-1/2 everything went crazy. I was the flying pilot and I recognized what was happening- the static ports were taped during the "airplane wash", a scenario that I had read about and had brought down two airliners. Transport category airplanes have an alternate static port- but it was also taped. The FO (actually another captain), was befuddled and wanted to run the emergency procedure for AHRS failure. I knew this was not what was happening and tried to tell him otherwise. He was confused. I was in a difficult position- trying to fly an airplane without airspeed, VSI or altitude while trying to tell the FO what I wanted him to do with lights flashing at us. So I engaged the autopilot. The instructor insisted the autopilot would not work- but I knew the autopilot and knew I would have heading mode and pitch mode. Sure enough, the autopilot worked with these modes. So I told the FO it was his airplane, to continue using the pitch and heading modes as we climbed using the GPS altitude, requested radar vectors for an ILS. I was pretty sure the autopilot would work in the approach mode- sure enough, it did. During the debrief we were told that about 50% of the crews "crashed" when this emergency was introduced and we were the first crew to try the autopilot and that it would become standard to suggest its use to the crew during the failure. About a year later I ran into the instructor again and he told me that of those who used the autopilot during this failure 100% survived. The failure rate of those hand flying it was still about 50%.
Finally I would add that if an airplane has an autopilot IMC is not the time to learn how it works. The time to learn this is in VFR conditions.
