Originally Posted by
Ian W
To meet the requirements of DO-260B 2.2.3.2.1.2 c 1 the aircraft will use the normal indication for the OFF message; weight off wheels, squat switch, rad-alt and set the airborne indicator in the ADS-B Extended Squitter message.
Well in this case the combination of those appears to have set the airborne indicator in just 20% of the paved runway available at a groundspeed of 93kts - plus maybe 10 kts wind. Not a factor in the safety of the aircraft, but it appears to have resulted in us being able to analyse reported altitude at several data points during the remaining take off roll, and whilst they are all located slap bang along the centreline and the speeds look reasonable, one or two of the altitudes look a bit odd and make me wonder like Tucoma Sailor about where rotation was first attempted.