by V12 » Mon Oct 29, 2018 8:04 pm
Strange behaviour of the A32x autopilot
Today, I performed flight LZIB-LOWI with actual version IDG A32X package with A320-214.
T/O LZIB 04, direct to NANIT (STAR NANI1A for runway 26). When I was 50 miles from NANIT, I checked weather and decided to change FP for strong gusty wind from 100. Changed destination runway to 08, approach RNVZ08, STAR NANI1A. All was OK till I reached wpt RTT, then A/P skipped wpt WI750 and continued direct to wpt WI751. I observed this error, changed wpt back to WI750, but A/P again skipped to WI751. I take command over Buse's silicon brain and manualy headed toward WI750. When I reached this wpt, A/P switched on, but George didn't perform route follow and headed toward the hill. GPWS was silent, I again take control, dodged the hill, A/T failed to maintain commanded 160 kts. I proceed manualy to WI751, WI754, lined up with 08 and landed. Why A/T failed, I have no idea. Commanded speed was 160 kts, but Bus accelerated to 180 kts and had tendency to overspeed limit for full flaps. Manual thrust worked flawless.
Fly high, fly fast - fly Concorde !