Dear American Aviation,
After 300 hours of usage on your Ram Air Recovery System and Aerodynamic Speed Stacks, I feel obliged and competent to comment on the performance increases I am seeing.
As you know, Trend Monitoring was in place prior to your modifications and is still being used.
When I took delivery of N341MH, after your modifications, for a moment, I thought I had walked to the wrong aircraft! It looked so different, a totally smoother, and more attractive machine.
Like most, just after we purchased our new/used E-90, I took numerous photos, from various angles of the new arrival. It was only after comparing the photos of pre-mod. and post-mod. that I fully realized and appreciated the esthetic change. Not only the nacelles, but the entire aircraft looks considerably longer, more streamlined, and flowing.
I am still amazed, 300 hours later, at the number of pilots and people on the ramp that stop, look and ask questions.
Our torque readings at any altitude have increased by an average of 150 pounds and we are never “temp” limited. Our oil temps, at lower altitudes, are lower by 3 to 4 degrees and the oil pressure increased about 3 to 4 pounds per side at all altitudes. True air speeds at 15,000 feet now average 264 knots. I have yet to be corrected that, “N341MH is the fastest -28 powered E-90 in the world.” And since your modifications, fuel burns are slightly less.
Even after 300 hours, no loose screws, nuts, or fasteners. No missing rivets, no loose bonding or fillers, and no visible cracks or flaws – the installation was superb.
Feel free to use this letter as necessary and I will be happy to confirm or show proof of any of the statements herein mentioned.
Robert W. Astle
King Air E90 Owner/Pilot