Why am I receiving speed violations?
Speed restrictions are put into place for 2 reasons.
- Federal Aviation Administration regulations
- Airframe limitations placed on the aircraft by the manufacture
250 KIAS (Knots indicated air speed) at or below 10,000 MSL (Mean sea level). Placed by the FAA.
VNE (Speed Never Exceed) This varies per aircraft, but typically an Airliner is 350 KIAS moving to .87-.89 Mach. The Dash 8 is significantly less, as well has having a lower service altitude. Knowing the aircraft you are flying is a must.
How to avoid these violations.
During climb it is ok to set the A/P speed to maintain under the 250 KIAS to 10,000. However you need to watch the speed until you are leveled off at cruising altitude. As we gain altitude the indicated airspeed will decrease while keeping the same Mach speed. So setting the A/P at a lower altitude while climbing will result in a violation.
Descent you may set your speed descending, however particular attention needs to be taken to make sure your V/S doesn’t cause you to remain at the same speed while trying to loose it, or gain speed if the V/S is too great. This is especially true in a heavy aircraft.
Known overspeed bugs
There is only one bug in which once a overspeed warning has sounded for a given period of time uncorrected. It will continue to sound, but not give out violations when corrected.
The autopilot is a great tool, but it is not a substitute for the person flying the aircraft!