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adjusted.
S If necessary for your airworthiness authority,
do a second inspection of the controls.
(8) Install the horizontal stabilizer fairing. Refer to Section 55-10.
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-38-00 Page 205
20 Sep 2007
D. Elevator Trim Handwheel Friction Damper Adjustment Procedure
Detail Steps/Work Items Key Items/References
(1) Remove these items for access:
S The pilots’ seats.
S The center console cover.
Refer to Section 25-10.
(2) Loosen the self-locking nut on the handwheel
pivot bolt.
On the right of the mounting frame.
(3) Loosen the locknut for the handwheel friction
damper.
Against the right inner face of the
mounting frame.
(4) Adjust the friction damper nut. Against the pack of washers and spring
washers on the pivot bolt.
(5) Measure the friction force. The friction force must be 200 N
(45 lb.).
(6) Do items 4 and 5 as necessary.
(7) Tighten the locknut for the handwheel friction
damper.
(8) Tighten the self-locking nut on the handwheel
pivot bolt.
(9) Do an inspection of all the controls that you have
adjusted.
S If necessary for your airworthiness authority,
do a second inspection of the controls.
(10) Install these items:
S The pilots' seats.
S The center console cover.
Refer to Section 25-10.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 206
20 Sep 2007 27-38-00 Doc # 6.02.01
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AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-39-00 Page 1
20 Sep 2007
Section 27-39
Stall Warning System
1. General
The DA 40 has a simple mechanical stall warning system.
2. Description and Operation
Figures 1 and 2 show the stall warning system.
The stall warning horn is located in the instrument panel. A flexible hose connects the stall warning horn
to a hole in the leading edge of the left wing. When the angle of attack of the wing is just less than the stall
angle, the airflow through the hole operates the horn. A ball-valve in the tube stops air and water flowing
from the outside into the cockpit through the stall warning system.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 2
20 Sep 2007 27-39-00 Doc # 6.02.01
Rev. 5
Stall Warning Horn
Retaining Ring
Attaching Screw
Attaching Nut Instrument Panel
Flexible Tube from Wing Leading Edge
25 mm
20 mm
Ball Valve
Cotter Pin
Ty-wrap
Figure 1: Stall Warning System, Installation in Larger Instrument Panels
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-39-00 Page 3
20 Sep 2007
Figure 2: Stall Warning System, Installation in Smaller Instrument Panels
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 4
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AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-39-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the stall warning system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the
Repair column.
Trouble Possible Cause Repair
Stall warning horn does not
operate.
Stall warning horn defective.
Water frozen in the stall warning
system.
Replace the stall warning horn.
Drain the water from the stall
warning system.
Stall warning operates too early
during stall.
Stall warning horn defective. Replace the stall warning horn.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 102
20 Sep 2007 27-39-00 Doc # 6.02.01
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AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-39-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the stall warning horn. They also tell you how
to drain water from the stall warning system.
2. Remove/Install the Stall Warning Horn
A. Remove the Stall Warning Horn
Detail Steps/Work Items Key Items/References
(1) Remove the instrument panel cover. Refer to Section 25-10.
(2) Disconnect the hose from the stall warning horn:
S Cut the cable tie that connects the hose to
the stall warning horn.
S Carefully pull the hose from the stall warning
horn.
　
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