Table of Contents
R
PRIMUS
1000 Integrated Avionics System
Writing the Report
Define the problem, including 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
Any inputs that fail to work (such as heading bug when in HDG
mode).
Commonly Used Terms
Table 7–16 lists some of the most common terms and their definitions.
Term
Autopilot Active Controls continually move in still air with small
Autopilot Loose Autopilot does not null command bars
Porpoising
Pumping
Stick Bump
Stick Buzz
Troubleshooting
7-32
command errors.
satisfactorily in most modes.
Low frequency oscillation in the pitch axis,
typically 10–second period or longer.
The control wheel moves back and forth,
usually with a low frequency, and typically a
1 to 10 second period.
Controls give a quick moderate movement,
usually with virtually no aircraft movement, and
mostly associated with autopilot engagement or
mode changes.
With autopilot engaged, a high frequency, small
movement of the control wheel can be felt
without aircraft movement.
Definition of Terms
Table 7–16
Definition
A28–1146–134
REV 1 Jan/03
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Troubleshooting
