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钻石20飞机飞行手册 DA 20 Airplane Flight Manual(77)

时间:2011-10-28 13:14来源:蓝天飞行翻译 作者:admin
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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. 

 

4.4.6. Before Take-off 
22a. Autopilot Disengaged (AP DISC)
4.4.9. Cruise
Insert after
6.
Engine Gauges check

7.
Autopilot Operation (if desired)


NOTE

A guide containing useful operating information is available from S-TEC Corporation, One S-TEC Way, Municipal Airport, Mineral Wells, Texas, 76067-9236, USA. The Guide, P/N 8777, is titled Pilots Operating Handbook, “System Twenty, System Thirty, System Thirty ALT, Autopilots”
ROLL MODE
1.
Check Autopilot Master ON

2.
Mode Select Switch Select desired roll mode ALTITUDE HOLD MODE


1. Check Autopilot Master ON
NOTE

The aircraft should be trimmed for level flight prior to “Altitude Hold Engagement”.
2.
ALT ENG / DISENG PRESS

3.
Trim “UP”, trim “DN” annunciators MONITOR


4.4.11. Landing Approach
1. Autopilot Disengaged (AP DISC)

5. PERFORMANCE
There is no change in airplane performance with the autopilot system installed.
6. WEIGHT AND BALANCE
The installation adds 11.1 lbs (5.0 kg) of weight at a –24.6 in (–.62 m) arm.
7. DESCRIPTION OF THE AIRPLANE AND ITS SYSTEMS
7.15. System Description
The System 30 is a pure rate autopilot which uses an inclined rate gyro in the Turn Coordinator instrument as the primary roll and turn rate sensor and an accelerometer and an absolute pressure transducer as pitch rate sensors.  The turn coordinator includes an autopilot pick-off, a gyro RPM detector and an instrument power monitor.  Low electrical power will cause the instrument "flag" to appear while low RPM will cause the autopilot to disconnect.  The autopilot includes an automatic pre-flight test feature that allows a visual check of all the annunciator lamps and checks critical elements of the accelerometer system. The test feature will not enable autopilot function unless the automatic test sequence is satisfactorily completed.
 
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