Originally Posted by
zambonidriver
That's indeed rather surprising.
What was the xwind limit before this surfaced?
Firstly, the 15kts is a TOTAL wind limitation, not a crosswind. And within that 15 kts is a maximum gust of 5kts! Challenging conditions indeed.
Once the software fix has been uploaded (September/October) the limit will revert to a ‘maximum demonstrated’ of 30kts.
Along with the wind limit is an approach speed limit - approach to the threshold at ref+10, which again has a huge impact on landing distance especially in the wet.
The original heavy landing resulted in a 22kt crosswind limit and min speeds of ref+5 (FAA) and ref+10 (EASA). Bizarrely, in the second instance that cause the more dramatic AD, the pilot didn’t appear to be adhering to the original limits.
The cause is rapid ‘push pull’ inputs on the sidestick (full fore/aft 4 times in under a second) coupled with ‘sideslip’ cause erroneous activation of the pitch limiter. As for why this hasn’t been spotted by Gulfstream during testing, join the long line of people asking that question, including I suspect a number of Lawyers!
The G700 has also been delayed as a result. It has similar software but the new FAA requirements for ‘link by line’ model based testing have delayed its approval.