The State Education Department has posted a form for eligible teachers to appeal their growth score (PDF). The Board of Regents approved the new appeal process as part of emergency regulations earlier this month. The deadline to file paperwork is Oct. 19. SED has also posted a frequently asked questions document (PDF).
Currently those eligible are teachers who received a highly effective rating on their observations, an ineffective on their growth score in 2014-15 and an effective or highly effective on their growth score in 2013-14. During the 30-day comment period on the regulations, NYSUT will be seeking an expansion of the definition of "eligible teacher" to make more of our adversely affected teachers eligible to appeal their scores.
Here's a chart explaining who is eligible to file appeals.