Originally Posted by
army_av8r
The day of this accident, we had an unusually high pressure system over the area. In Eastern Texas and Louisiana we had altimeter settings of 30.56 and higher. That would cause transponder pressure altitudes to read 500-600 low on these readouts. With that adjustment, they would have been flying around 800-1000 feet AGL.
One would assume they would set the altimeter to ground elevation prior to take off.