PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
Troubleshooting
9-2
Rule 1 states that system conditions must be considered before the
writeup is made. To aid in determining these conditions, the following
type of questions must be answered.
D Are any flags in view or fault annunciators lit (obvious problems)?
D Is the problem in pitch, roll, or yaw axis or a combination thereof?
D Istheproblempresent inallmodesoronlyunderspecificconditions
such as:
- Flaps or gear up or down, or speed brakes in or out
- Certain aircraft power configuration
- Certain speed
- Certain altitude
- Two or more modes
- Certain sequence in mode selection
- Specific radio frequencies (NAV or COM)
- When keying a transmitter
- When weather radar is operating
- Certain electrical configurations (are all circuit breakers in)?
D Does the autopilot follow the commands as shown by the flight
director command cue and horizontal situation indicator lateral
deviation bar?
D Can the pilot fly the flight director commands with the autopilot
disconnected?
D Does some problem exist with autopilot engaged in a heading hold
and pitch hold mode?
D In radio modes, are certain conditions, such as another aircraft in
frontofLOCorGStransmitter (overflight disturbances), VORbeam
scallops, etc., present?
Rule2statesthatanadequatedescriptionmustbemadewhenmaking
awriteup.Thedescriptionshoulddefinetheproblemandshouldalways
includethespecificconditionsunderwhichtheproblemexists,suchas:
D Flags showing (which ones, if any)
D Mode or modes selected.
D The IAS present when the problem occurs
D Period and magnitude of any oscillations
D Do any inputs fail to work (such as heading bug when in HDG
mode)?
NOTE: The preceding paragraphs are not intended to cover every
possible system problem. They should be used as guides in
preparing a pilot writeup.
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