Schleicher ASK-21
Assembly & Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 1 of 7
Assembly: (See photo details below)
Assembly requires 3 to 4 people. The steps are as follows:
▪ Make sure a wing stand is available (Stored In ASK-21 Trailer)
▪ Get the tool pouch from the trailer Fig 1
▪ Put the protective wing cushions on the trailer rails Fig 2
▪ Roll the fuselage out of the trailer - keep it in the fuselage cradle Fig 3
Make sure the rudder does not hit the middle rail support Fig 4
▪ Clean and grease all pins, bolts, bushings and control system connections.
▪ Make sure the dive brakes are unlocked in the wings
▪ Install the left wing first
o The tip is lifted and backed out of the trailer as far as it will go
o Walk the tip away from the fuselage perhaps 20 degrees
o Lift the wing root and set it on the trailer rail
o Walk the tip until it is opposite the wing opening
o Rotate the wing to its flight attitude (horizontal)
o Using 2 people, lift the wing root and install it in the fuselage
o Once the wing is seated, put it on the wing stand
▪ Install the right wing using the above procedure
▪ Install and lock the wing main pins. Fig 5
DO NOT INSTALL THE REAR PINS BEFORE THE MAIN PINS.
▪ Using the red T shaped tool, insert the rear pins. Fig 6, 7, 8
Make sure the spring locks secure these pins in place.
▪ Connect the 4 manual control connections in the fuselage behind the spar tunnel.
When properly installed the pin on the ball socket will be extended, and the safety lock will be
properly positioned. See the drawings on the cover panel. Fig 9, 10
▪ Before closing up the cover over the manual control connections in the fuselage, have a second
pilot verify proper connections.
▪ Close and lock the control connection access cover.
▪ Install the horizontal stabilizer from the front. Fig 11, 12
Use the Allan wrench to install the bolt at the leading edge. Fig 13
Make sure the spring-loaded safety pin snaps out over the screw head
The elevator is automatic hookup.
▪ Install the TE probe into the vertical stabilizer.
▪ Install the wing-tip wheels. Fig 14
▪ Perform Positive Control Check
▪ Tape the: Wing roots, stab & fin gap, rear wing pin hole, horizontal stabilizer hole & control
access panel.
▪ Lower and remove the fuselage cradle Fig 15, 19, 7 20
▪ Return fuselage cradle and wing dollies to the trailer & secure in place Fig 16, 17
▪ Return the tool pouch & wing stand to the trailer
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