BY ORDER OF THE SECRETARY OF THE AIR FORCE AIR FORCE ...

AFMAN 11-217V1 3 JANUARY 2005 83
and each dot is 1¼°. If the localizer course is 3° wide, then full-scale deflection is
1½° and each dot is ¾° (Figure 5.7). The range indicator displays slant range
distance in nautical miles to the selected DME transponder and may or may not
operate when ILS modes have been selected depending on equipment installation.
Additional displays available on electronic horizontal situation indicators include
ARC formats to display a segment of the standard display as well as MAP formats
used to pictorially display bearing and distance to NAVAIDS or waypoints.
5.3.2.2. Course Selector Knob. The course selector knob on most flight directors
may be used to select any of 360 courses. To select a desired course, rotate the head
of the course arrow to the desired course on the compass card and check the course
selector window for the precise setting. The TO-FROM indicator is a triangularshaped
pointer. When the indicator points to the head of the course arrow, it indicates
that the course selected, if properly intercepted and flown, will take the aircraft to the
selected facility.
5.3.2.3. Heading Set Knob. The heading set knob on most flight directors is used to
set the heading marker to a desired heading. With the proper mode selected on the
flight director control panel, the heading marker can be slaved to the flight director
computer. Thus, when a heading is set, the command bars will command the bank
attitude required to turn to and maintain the selected heading.
5.3.3. Flight Director Computer.
5.3.3.1. Flight Director Computer Information. The flight director computer receives
navigation information from the navigation systems and attitude information from the
attitude gyro. Depending on the modes available and selected, the computer supplies
pitch or bank commands to the command bars of the ADI. The functions of the
computer vary with systems, and a number of inputs (NAVAIDs, datalink, Doppler,
etc.) may be electronically processed by the system.
5.3.3.2. Flight Director Systems. In some flight director systems, the command bars
can be used for other maneuvers such as intercepting VOR, TACAN, and Doppler
courses or performing data link intercepts. Pitch command information can vary
from terrain avoidance commands to commanding a selected altitude. In all cases,
the command bars display command information and do not reflect actual aircraft
position. This section is limited to command information pertaining to selected
headings and ILS approaches and is common to most flight director systems. Refer
to the appropriate flight manual for the specific capabilities of the system installed in
your aircraft.
5.3.4. Flight Director Modes.
5.3.4.1. Heading Mode. The flight director usually has mode selectors that allow the
pilot to select command steering to a heading or to various navigation systems.
5.3.4.2. ILS Intercept Mode (Figure 5.10). This mode is designed to direct the
aircraft to, place it upon, and maintain it on the localizer course. This is
accomplished by positioning the bank steering bar to command the pilot to fly flight
director computed headings.