DA20-C1 Flight Manual
Supplement 5
Doc # DA202-C1 April 16, 2009 Page S5 - 5
Revision 24 DOT Approved
4.4.4. Before Taxiing
2a. AP Master Switch ON (if desired)
2b. Autopilot Mandatory Pre-flight Test COMPLETE
Autopilot Mandatory Pre-flight Test
A. Observe all lights and annunciators illuminate.
B. Observe the following light sequence of the trim indicators:
(Sequence requires 9 seconds).
1. Initially both trim UP and DN lights are illuminated.
2. UP light extinguishes and remains off.
3. DN light then extinguishes and remains off.
4. All lights extinguish except for "RDY" light.
The autopilot can be engaged and disengaged repeatedly using the mode selector knob. The
autopilot can be disengaged using the A/P disconnect switch. Once the A/P master is switched
off, the test must be reconducted to get a ready indication. If the ready light does not illuminate
after the test, a failure to pass the test is indicated and the system will require service.
Altitude mode cannot be engaged unless power is on for more than 15 seconds.
System Functional Test
1. Push Mode Switch – STB Annunciator illuminates. Rotate “Mode Select” knob
left and right. Observe control stick moves in corresponding direction. Centre
turn knob.
2. Set D.G. and place heading bug under lubber line (if installed). Push “Mode
Select” knob to engage HDG mode. Observe HDG annunciator. Move HDG bug
left and right. Observe proper control stick motion.
3. Overpower test – Grasp control stick and overpower roll servo left and right.
Overpower action should be smooth with no noise or jerky feel. If unusual sound
or excessive play is detected, have the servo installation inspected prior to flight.
4. Radio Check
a) Turn on NAV Radio, with valid NAV signal, engage LO TRK mode and
move VOR OBS so that VOR needle moves left and right – control stick
should follow the direction of needle movement.
b) Select Hi TRK mode – the control stick should again follow radio needle
movement and with more authority than produced by Lo TRK mode.
5. Move control stick to level flight position – Engage ALT mode. Move control stick
fore and aft to overpower pitch servo clutch. Overpower action should be smooth
with no noise or jerky feel. If unusual sound or excessive play is detected, have
the servo installation inspected prior to flight.
6. Trim Check – Manually apply back pressure to control stick for 2-3 seconds.
Observe the DN trim light illumination and the alert tone is heard. Apply forward
pressure to the control stick for 2-3 seconds, observe the UP trim light
illumination and the alert tone is heard. Move the control stick to centre.
Observe both UP/DN lights extinguish.
7. Hold control stick and push mode knob for 2 seconds or press the “AP DISC” on
the control stick. Note that roll and pitch servos release. Move control stick to
confirm roll and pitch motions are free, with no control restriction or binding.
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