
G1000 System Maintenance Manual – Diamond DA40/40F Page 5-17
190-00545-01 Revision G
Table 5-9. AFCS Annunciation Troubleshooting (Cont)
Annunciation Condition Resolution
Elevator Mis-Trim
Down
If elevator mistrim annunciations persist, check the pitch and pitch
trim servos for proper operation. Verify that the servo is online at
the AUX – SYSTEM STATUS page.
Check the servo wiring and connectors. Ensure the servo is
receiving power.
Check the aircraft control adjustments.
If mistrim condition still exists, remove and replace the affected
servo.
Elevator Mis-Trim
Up
Aileron Mistrim
Right
Check for possible fuel imbalance.
Check aileron control adjustments.
If mistrim condition still exists remove and replace the roll servo.
Aileron Mistrim Left
Pre-Flight Test
Fails
Allow the system to complete pre-flight tests.
The preflight test should finish within 2 minutes. If it does not pass,
the red ‘PFT’ annunciation is shown. In case of PFT failure, see
Sections 5.5.3 and 5.5.4 for additional PFT diagnostics.
Table 5-10. AFCS General Troubleshooting
Condition Resolution
Poor AP Performance
(Limited AP Authority)
Check each servo mount slip clutch per Section 4.10. Verify the
clutches are not excessively loose and are within torque limits.
Check aircraft controls for proper balancing and adjustment per the
DA40 AMM.
AP DISC Problems
For intermittent nuisance disconnects with no AFCS of PFT alert,
check A/P disconnect switch and wiring for intermittent faults.
If an AFCS or PFT alert is displayed at the time of the disconnect,
troubleshoot per Table 5-9.
Check the GIA AFCS Fault Logs according to Section 5.5.3. If a Mon
Prmtr Invalid message is received, check for valid true airspeed. A
faulty GTP 59 OAT probe may cause TAS to become invalid, which
will flag the Mon Prmtr Invalid message.
Manual Electric Trim Failure
Check pitch trim servo status.
Check MET switch discrete inputs to both GIAs by going to the GIA I/O
Configuration page and selecting DISCRETE IN inputs.
AutoTrim Failure (Trim does not run
while flaps in motion)
Check flap-in-motion discrete inputs to both GIAs for proper operation
by going to the GIA I/O Configuration page and selected DISCRETE
IN inputs. See Section 4.9.
If continually ‘open’ troubleshoot flap motor & discrete input wiring
(refer to DA40 AMM).
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