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Subject:
Maintenance instruction for aileron adjustments
Serial number
applicability:
All ASW 20 and ASW 20 L
Compliance:
None, only if the glider displays a tendency to turn in a particular direction from straight
and level flight.
Reason:
During straight and level flight with the controls free, the pilot observes that the glider
turns to a direction, or constant control pressure is necessary to keep it in straight flight.
Action:
It is recommended to conduct the following measures in the sequence as described be-
low:
1.) Select flap setting 1 (-11º) and check whether the control deflections as per flight
2.) Conduct a test flight in smooth air while trying to avoid any sideslipping.
ASW 20
Maintenance Instruction i
Issue 1
and operation manual are achieved in full.
At the wing root the flaps must deflect upwards by 49mm. The ailerons of the ASW
20L (15 m version) must allow an upward deflection of 32 mm when measured at
the wing tip. Both deflections must be achieved without any gap sealing tape being
stretched or becoming tight.
Please note that the sealing tape is cotton based and tends to shrink when ex-
posed to high humidity or water.
When sealing tape is replaced it is very important to ensure that the tape is not get-
ting tight at full control deflections and at the measurements mentioned above.
Aging sealing tape has a tendency to creep out of the gap between wing and con-
trol surface. If this happens it results in much increased drag and can explain the
aircraft's tendency to turn in a particular direction after straight and level flight. This
is particularly noticeable if the tape has "popped out" on one wing only.
Please refer to maintenance instruction D (point 2), where (in a different context)
further details on proper gap sealing and its effect on the ASW 20's aerodynamics
are explained.
a) Check whether the airbrakes are sealing properly and remain flush with the up-
per surface of the wing. If not, please adjust airbrakes as per maintenance
instruction C.
b) Check whether the ailerons have identical deflections on both wings at a speed
of approximately 160 kph (85 kt) and at flap settings 2 and 1.
Alexander Schleicher
GmbH & Co.
Segelflugzeugbau
D - 36163 Poppenhausen
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Related Manuals for Alexander Schleicher ASW 20
Summary of Contents for Alexander Schleicher ASW 20
- Page 1 “popped out” on one wing only. Please refer to maintenance instruction D (point 2), where (in a different context) further details on proper gap sealing and its effect on the ASW 20’s aerodynamics are explained.
- Page 2 For further details please refer to sketches 1 and 2 below. The drag pin replacement is described on page 39 of the ASW 20 flight and opera- tion manual (or page 43 of the ASW 20 L flight and operation manual).
- Page 3 2.) As it is mandatory to check all control deflections after adjustments as per page 42 of the ASW 20 flight and operation manual (or as per page 46 of the ASW 20 L flight and operation manual), it is recommended to conduct the work in connection with an annual inspection.
- Page 4 ASW 20 Alexander Schleicher Page GmbH & Co. 4 of 5 Maintenance Instruction i Segelflugzeugbau Issue 1 D - 36163 Poppenhausen Sketch 1: eccentric drag pin There are bolts available with 0,5mm and 1,0mm eccentricity Sketch 2: Glider turns right with controls free, i.e. in straight and level flight, the stick must be pushed to the...
- Page 5 ASW 20 Alexander Schleicher Page GmbH & Co. 5 of 5 Maintenance Instruction i Segelflugzeugbau Issue 1 D - 36163 Poppenhausen Sketch 3: Modification of the aileron differential according to action 4.b.
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