Honeywell PRIMUS 1000 Pilot's Manual page 232

Event
Code
No. Description
03XX Power–Up Event Codes – EFIS
0320 RS–422 channel
No. 3 Universal
Asynchronous
Receiver–Trans
mitter (UART)
Data Manage–
ment Analysis
(DMA) transfer
event, either a
DMA error
occurred or the
UART did not
request DMA.
0321 RS–422 channel
No. 3 UART TX
or RX parity or
framing error.
0321 RS–422 channel
No. 3 UART RX
data event. DMA
transfer occurred
to wrong address
or RAM did not
accept the data.
91XX – Continuous Event Codes That Prevent Autopilot Engagement
9100 VG was invalid
when the AP/YD
was engaged or
when the AP
button was
pushed.
A28–1146–134
REV 1 Jan/03
PRIMUS
Possible Causes
This is generally a
nuisance code that
logs infrequently.
IAC is suspect.
This is generally a
nuisance code that
logs infrequently.
IAC is suspect.
This is generally a
nuisance code that
logs infrequently.
IAC is suspect.
Crew attempted to
engaged the AP
before both VGs
were valid.
Common Event Codes
Table 7–5
R
1000 Integrated Avionics System
Maintenance
Actions
Maintenance is
required only when 5
or more occurrences
are observed in one
flight.
Maintenance is
required only when 5
or more occurrences
are observed in one
flight.
Maintenance is
required only when 5
or more occurrences
are observed in one
flight.
No maintenance
required. Both vertical
gyros must be valid
when the autopilot is
engaged.
Troubleshooting
7-13