Specifications

SECTION III
INSTRUMENTATION AND AVIONICS
MODEL 560
An altitude trend vector is displayed on the left edge of the altitude tape and provides an indication of
the rate of altitude change. The trend vector extends vertically from the apex of the current altitude display
window. The vector extends up for positive vertical trends and down for negative values. The vector
represents a prediction of what the altitude will be in six seconds if the current vertical speed is maintained.
Standby altitude indications are always available from the standby flight display which is discussed
under Standby Flight Display System below in this section.
MACH NUMBER DISPLAY
A digital readout of indicated Mach number is displayed below the airspeed dial. The Mach number
will come up on the display when Mach exceeds 0.390, and is removed when it is falls below 0.380 Mach.
Resolution of the Mach display is 0.0001 Mach.
VERTICAL SPEED INDICATION
Vertical speed data is developed in the AZ-850 Micro Air Data Computers, which sense the
rate-of-change of altitude from inputs of the static system. The computers convert the data into digital form
and transmit it through the digital data bus system to the IC-600 Display Guidance Computers, which
forward it to the DU-870 Primary Flight Displays where it is generated into a visual display.
The vertical speed display is a fixed scale meter movement type display; a pointer rotates about a
point which is outside of the actual display. The scale is non-linear, which provides increased resolution
around zero vertical speed. In the center of the scale a digital readout of the actual vertical speed is
displayed. The digital display has a resolution of 50 feet per minute and can accommodate rates of climb or
descent of 9900 feet per minute. On the display scale tick marks are located at the positive and negative
values of 500, 1000, 1500, 2000, 2500, and 3000 feet per minute. The pointer will continue to move up to
plus or minus 3200 feet per minute but will have a reduced sensitivity. The digital display and the digital
readout box will be removed from the display for vertical speeds of plus or minus 500 feet per minute,
leaving only the meter type display.
Figure 3-4 Vertical Speed Display
I 3-8 Configuration AA 56OMB-01