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DA20-C1 AMM
Navigation
Doc # DA 201-C1
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29 Apr 2004
E. Directional Gyro (DG)
The DG is a gyroscopic instrument either vacuum or electrically powered. The DG operates
when sufficient vacuum is applied. The vacuum powered DG requires differential pressure of
4.5 - 5.2 in.Hg, Flow 2.1 ft3/min to operate.
The DG shows the direction of the airplane related to a preset heading. You set the heading by
pushing and turning the knob on the face of the DG. The display has a 360° compass card with
5° graduations.
Navigation
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Figure 3: Stall Warning Horn
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 9 34-20-00 Page 101
29 Apr 2004
TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the attitude and direction instruments. See Chapter 92 for
wiring diagrams.
Complaint Possible Cause Remedy
Turn coordinator warning flag in
view.
Turn coordinator operation not
reliable.
Turn coordinator circuit-breaker
open or defective.
Power supply wiring defective.
Ground connection defective.
Turn coordinator defective.
Close or replace the turn
coordinator circuit-breaker.
Do a test for the correct
voltage at the instrument.
Repair the power supply
wiring/connector.
Do a test for correct ground
connection. Repair the
ground wiring/connector.
Replace the turn coordinator.
Attitude indicator or directional
gyro operation not reliable.
Vacuum system defective.
Power supply wiring defective.
Ground connection defective.
Instrument defective
Repair vacuum system - See
Chapter 37-00.
Do a test for the correct
voltage at the instrument.
Repair the power supply
wiring/connector.
Do a test for correct ground
connection. Repair the
ground wiring/connector.
Replace the instrument.
Magnetic compass leaking fluid. Defective compass housing. Replace the compass.
Compass deviation more than
10°.
Residual magnetism of a metal
component in the airplane.
Defective compass.
Compass out of calibration.
Do a test for residual
magnetism using a hand-held
compass. If necessary,
Degauss the component.
Replace the compass.
Do a compass swing. Refer
to Maintenance Practices in
this Chapter.
Stall warning horn does not
operate.
Stall warning horn defective.
Water frozen in the stall
warning system.
Replace the stall warning
horn. Refer to Maintenance
Practices in this Chapter.
Drain the water from the stall
warning system. Refer to
Maintenance Practices in this
Chapter.
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DA20-C1 AMM
Navigation
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MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install instruments. And they tell you how
to remove and install the stall warning horn. They also tell you how to test and adjust the magnetic
compass (compass swing).
Be specially careful when you work on or move gyroscopic instruments. Make sure that the gyro
stops turning before you start to remove the instrument. Use only the correct shock-proof container
for shipping. Mark the container ‘VERY FRAGILE’ ‘HANDLE LIKE EGGS’.
2. Remove/Install the Magnetic Compass
A. Remove the Magnetic Compass
Detail Steps/Work Items Key Items
(1) Remove the instrument panel cover. Refer to Chapter 25-10
(2) Disconnect the lighting plug.
(3) Remove the mounting screws. Hold the compass!
(4) Remove the compass from the panel.
B. Install the Magnetic Compass
Detail Steps/Work Items Key Items
(1) Put the compass in position in the instrument
panel.
(2) Install the mounting screws.
(3) Connect the lighting plug.
(4) Install the instrument panel cover. Refer to Chapter 25-10
(5) Do a compass swing
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3. Test/Adjust the Magnetic Compass
You must do a test for correct operation of the compass (compass swing):
− After replacing a major component.
− After replacing the compass.
− After modification to the airplane.
CAUTION: USE ONLY NON-MAGNETIC TOOLS TO ADJUST THE COMPASS.
CAUTION: DO NOT WEAR OR CARRY METALIC MATERIAL (WATCHES,
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