The two Embraer RJ-135 prototypes in flight test have accumulated some 235h of testing and demonstration flights. The second aircraft, which joined the programme on 24 September, is a conversion of the second pre-series ERJ-145 and is being used for system testing. The first aircraft, which is being used to check performance and flying qualities, has flown 101h of flight testing - but has flown more than 180h, including demonstration flights. US Federal Aviation Administration certification of the 37-seat derivative is on schedule for next June.
Source: Flight International
