Schleicher ASK 21 Installation instructions

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 1of 7
Assembly: (See photo details below)
Assembly requires 3to 4people. The steps are as follows:
▪Make sure awing 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
oThe tip is lifted and backed out of the trailer as far as it will go
oWalk the tip away from the fuselage perhaps 20 degrees
oLift the wing root and set it on the trailer rail
oWalk the tip until it is opposite the wing opening
oRotate the wing to its flight attitude (horizontal)
oUsing 2 people, lift the wing root and install it in the fuselage
oOnce 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 Tshaped tool, insert the rear pins. Fig 6, 7, 8
Make sure the spring locks secure these pins in place.
▪Connect the 4manual 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 asecond
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, 720
▪Return fuselage cradle and wing dollies to the trailer &secure in place Fig 16, 17
▪Return the tool pouch &wing stand to the trailer

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 2of 7
Disassembly: (See photo details below)
Disassembly is largely the reverse of assembly. It requires 3to 4people:
▪Make sure awing 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
▪Position the glider at the tail of the trailer.
▪Lift the glider on to the fuselage cradle
▪Position the fuselage cradle between the forward and rear cockpits. Fig 18
▪Put awing stand under the left wing
▪Remove the TE probe and store carefully in the glider Fig 17
▪Remove the tape from the wing root, horizontal stabilizer &all other taped locations.
▪Remove the bolt in the leading edge of the horizontal stabilizer using the Allan wrench,
▪Remove the horizontal stabilizer by moving it forward. Fig 11,12
Do NOT rock the tips of the stabilizer to move it forward -this can damage it!
▪Install the horizontal stabilizer in the trailer fittings.
▪Disconnect the 4control connections behind the spar tunnel.
▪Remove the rear wing pins using the red Tshaped tool. Fig 6,7,8
▪Remove the wing-tip wheels. (Store in Blue ASK-21 tool box)
▪Make sure the wing fixtures in the trailer are at the back of the trailer
▪Remover the right wing first
oSupport the tip
oRemove the main pins
oSlide the wing out, and walk the spar to the trailer rail
oRotate the wing to vertical
oWhen the tip is perhaps 20 degrees from the fuselage, move the spar to the wing dolly.
oNOTE: The pin hole closest to the wing tip goes onto the pin on the dolly.
oWalk the wing into the trailer until it stops.
▪Repeat the above procedure for the left wing.
▪Clean &re-grease all fittings and store in tool pouch Fig 1
▪Strap the fuselage into the fuselage dolly, and roll it into the trailer. Fig 18
▪Make sure ALL tools and parts are in the tool pouch Fig 1
▪Return theTool Pouch &Wing Stand to the trailer
▪If the trailer is going on the road, activate the over-center dive brake locks using the control
push rods.

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 3of 7
Figure 1 Tool Pouch
Rear wing Pins
Main Pin
Stab Pin
Rear Pin ToolRear Pin Tool
Grease
Pitot Extension
Stab Pin Allen Wrenches
Tape

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 4of 7
Figure 2 Wing Protector Cushions Figure 3
Figure 4 Don't let rudder hit support Figure 5Main spar pin and safety lock
Figure 6 T-Tool &Pin Figure 7 Rear Pin Hole Fig 8Rear pin insertion

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 5of 7
Figure 9 Control hook up cover Figure 10 Control hook up cover
Figure 11 Horizontal Stab Figure 12 Horizontal Stab
Figure 13 Horizontal Stab

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 6of 7
Figure 14 Wing Tip Wheels Figure 15 Lower &Remove Cradle
Figure 16 Cradle &Dollies secured Figure 17 TE probe storage
Figure 18 fuselage cradle Position

Schleicher ASK-21
Assembly &Disassembly
Rev Dec 19, 2017
File: ASK-21_Assembly Disassembly Instructions GBSC 2017-12-19.docx Page: 7of 7
Configuration of fuselage
cradle when it’s down. To
raise it, close the Release
Valve and operate the Foot
Pump until the Safety
engages.
To lower the cradle, lift
the Safety Handle to
disengage the Safety, and
open the Release Valve.
Use the handle -don’t
risk you fingers by lifting
the safety itself.
Safety
Release
Valve
Pump
Safety
Handle
Release
Valve
Figure 19
Figure 20