DG Flugzeugbau GmbH Flight Manual LS 8-18 Handling, Servicing, Maintenance
8.3.1 Alterations or Repairs
continued
Longitudinal Motion Pushrod Bearings
Important Note:
Longitudinal motion pushrod bearings should never be greased or oiled!
Longitudinal motion pushrod bearings are being used throughout the wing control system, in the
fuselage for elevator-, aileron- and landing gear drive systems. During repairs, never pull pushrods
out of longitudinal motion bearings as all balls will leave their cage. To re-install them, a cut-out
near each bearing must be cut and closed afterwards!
Forward Horizontal Tail Attachment
The forward horizontal tail attachment on the vertical tail consists of a special rod end bearing, which is
cemented in the correctly aligned position.(See also placards pages 10-2 and 10-3 of the Maintenance
Manual).
When the ball becomes loose (for instance by deliberate action or inadvertently) the attachment may be
damaged during horizontal tail assembly due to non-alignment of ball and corresponding pin.
Warning: Ask the manufacturer for special advice if this has happened.
8.4 Ground Handling / Road Transport
a)
Ground Towing
-
Tow at walking speed only
-
Use elastic cable from tow release and helper at wingtip
or
-
Use tail dolly with tow-bar and sprung wheel at one outer wing.
Warning: Towing backwards at too high speeds may yield undercarriage oscillation due to
rough ground, resulting in overcenter, collapse and bent drive lever.
b)
Parking
In no case
should sailplanes be parked without permanent supervision, because their weight is
small compared to wing area and damage can be expected in moderate wind.
c)
Tie-down
Tie-down out in the open as a substitute for a hangar place should never be considered:
weathering marks due to changes of temperature, ultra violet radiation and humidity can result in
rapid gelcoat deterioration; resulting cracks can cause eventual structural damage.
When permanent supervision can not be guaranteed, tie down as follows:
-
Place tail unit about 45° into main wind direction
-
Lay windward wingtip down
-
Place ground anchors to both sides of rear fuselage boom and wingtip
-
Strap rear fuselage and wingtip down using rope and foam to avoid scratching.
Edition: Dec. 2001
Revision – 1 (TB 8011)
Page 8-3