What is the difference between the ADI pitch information and the conventional Attitude indicator?
A – The pitch display is perhaps the most beneficial feature of the ADI when compared with conventional horizon indicators. For short term or immediate movement of the nose up or down, this instrument responds and is flown like any other gyroscopic pitch indicator. The difference is that after the display has moved in response to an attitude change the deflection is sustained by the resulting vertical speed. As compared to a pitch attitude display, the vertical speed display makes it easier to hold altitude and to maintain stable climbs and descents. Also, the movable airplane symbol does not have to be adjusted to compensate for the angle the fuselage flies when vertical speed is zero. It is recognized that an aircraft when at the limit of its altitude capability can fly at an ever increasing angle of attack when vertical speed indicates zero. For this reason an airspeed warning in the form of the letters “A-S” flashing in the DG display is provided. The answer to this situation is th
