Honeywell SPZ-8000 - Flight Guidance System Typical Problems; Lateral Mode Problems

SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
9-3
Troubleshooting
A digital system is more likely to have an external sensor problem (i.e.,
MADC, gyros, accelerometers, NAV/DME), than it is to have a problem
with the avionics computers. The avionics computers perform
extensive self--testing and continuous monitoring that positively affects
maintainability and reliability.
FLIGHT GUIDANCE SYSTEM TYPICAL PROBLEMS
Some of the typica l proble ms associated with flig ht control systems are
listed below. The list is organized according to lateral mode problems,
vertical mode problems, and problems that are common to both vertical
and lateral modes. Illustrations that show the most common lateral and
vertical mode problems are included. The list of problems and the
illustrations are not all inclusive, but are typical of the problems most
often encountered. It is assumed that the autopilot is engaged.
Lateral Mode Problems
Refer to Table 9--2 and see Figure 9--1 for an in--flight graphic
representation of lateral mode problems.
Mode
Problems
HDG mode D Tails
D Oscillates
D Won’t hold
NAV, BC or VOR APR mode;
also localizer portion of APR
mode
D Undershoots capture
D Overshoots capture
D Missed capture
D Standoff
D Oscillates
D Captures early
Lateral Mode Problems
Table 9- -2