SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
9-13/(9-14 blank)
Troubleshooting
The description should define the problem and should always include
specific conditions under which the problem exists, such as:
D Flags showing (which ones, if any)
D Mode or modes selected
D IAS when the problem occurs
D Period and magnitude of any oscillations
D Do any inputs fail to work (such as heading bug when in heading hold
mode)?
COMMONLY USED TERMS
Table 9--5 lists some of the most common terms with their definitions.
Term
Definition
Autopilot active Controls continually move in still air with small
command errors.
Autopilot loose Autopilot does not null command bars
satisfactorily in most modes.
Porpoising There is low frequency oscillation in pitch axis,
typically for a 10--second period or longer.
Pumping The control wheel moves back and forth,
usually with a low frequency. Typically 1 to 10
second period.
Stick bump Controls give a quick moderate movement,
usually with virtually no aircraft movement. This
is mostly associated with autopilot engagement
or during mode changes.
Stick buzz With autopilot engaged, a high--frequency, small
movement of control wheel can be felt without
aircraft movement.
Definition of Terms
Table 9- -5
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