[quoteCurrently, 2008, they use 90% for most of the 700mb or 10,000 foot level winds.
The other adjustments are for the 1000mb and 850mb flight levels which are mainly used on INVEST flights for Tropical Depressions and Tropical Storms with low wind speeds.
1000mb flight level is rarely used as it's usually too close to the water for Safety purposes.

Cool. Of course, every storm is different and I've seen cases where measured winds were not close to the 90% range. In this case, I'm looking more at satellite presentation in thinking Bertha isn't close to its former self. In fact, it doesn't look like much more than a mid-latitude low/frontal zone. I just loaded the Bermuda radar, and it does still look like a tropical storm there.