Jonker Sailplanes JS3 Instruction Manual

Type: JS Series
Technical Note
Rev: 1.0
Model/s: JS3
No: TN.03-057
Date of Issue: 22/07/2021
Title: Rudder Pedal Footplate Replacement
Page No: 1 of 5
Jonker Sailplanes Pty. Ltd. • Private Bag X1293 •Potchefstroom •South Africa, 2520
MO Number: M667 • DO Number: D667 • AMO Number: AMO1179
Reg No: 2013/134247/07 •VAT No: 494 023 1477
Web: jonkersailplanes.co.za • Technical Support Portal: portal.jonkersailplanes.co.za
1. RATIONALE
The JS3 rudder pedals are designed to accommodate the largest possible shoe. Therefor the pedals are angled to
move more parallel with the fuselage nose section near the pedals.
JS designed two differently shaped footplates to be attached to the rudder pedals:
Type 1:
•Part Numbers:
oRudder Pedal Footplate Left: 231 17 105 10
oRudder Pedal Footplate Right: 231 17 105 20
Type 2:
•Part Numbers:
oRudder Pedal Footplate Flat Left: 231 17 006 10
oRudder Pedal Footplate Flat Right: 231 17 006 20

Type: JS Series
Technical Note
Rev: 1.0
Model/s: JS3
No: TN.03-057
Date of Issue: 22/07/2021
Title: Rudder Pedal Footplate Replacement
Page No: 2 of 5
Jonker Sailplanes Pty. Ltd. • Private Bag X1293 •Potchefstroom •South Africa, 2520
MO Number: M667 • DO Number: D667 • AMO Number: AMO1179
Reg No: 2013/134247/07 •VAT No: 494 023 1477
Web: jonkersailplanes.co.za • Technical Support Portal: portal.jonkersailplanes.co.za
Reports have been received that the Type 1 rudder pedal plates provide uncomfortable feet support for certain
pilots, creating pressure points on the sides of the feet.
The Type 2 rudder pedal plates with a reduced toe-out angle reduce the strain on the feet noticeably.
2. MATERIAL AND TOOLS
Part A - Replacement of the Rudder Pedal Footplates
•Rudder Pedal Footplates Flat Set | QTY: 1 set | JS Part No: 231 17 006 10/20
•Loctite 243
•2.5 Allen Key
Part B - Adjustment of the Rudder Pedal Angles
•M6 Nyloc Nut; 316 SS | QTY: 2 | JS Part No: 104 04 010 00
•2.5 Allen Key
•No. 10 Spanner
•No. 10 Socket and Ratchet
•Flat Screwdriver
•3.0 Allan Key Bit with extension (for removal of Jet ECU)

Type: JS Series
Technical Note
Rev: 1.0
Model/s: JS3
No: TN.03-057
Date of Issue: 22/07/2021
Title: Rudder Pedal Footplate Replacement
Page No: 3 of 5
Jonker Sailplanes Pty. Ltd. • Private Bag X1293 •Potchefstroom •South Africa, 2520
MO Number: M667 • DO Number: D667 • AMO Number: AMO1179
Reg No: 2013/134247/07 •VAT No: 494 023 1477
Web: jonkersailplanes.co.za • Technical Support Portal: portal.jonkersailplanes.co.za
3. SPECIAL TOOLS
None.
4. REFERENCES
•MD10-AMM-00-001 - JS-MD 3 Aircraft Maintenance Manual
•MD10-AMM-00-002 - JS-MD 3 Jet Sustainer Maintenance Manual Supplement
5. INSTRUCTIONS
5.1 Part A - Replacement of the Rudder Pedal Footplates
1. Loosen the four M4x10 countersink Allen cap screws located at the top and bottom of each pedal.
2. Remove the old pedals and replace them with the new ergonomically improved version.
3. Apply a small amount of Loctite 243 on each of the M4x10 countersink Allen cap screws used to secure the
pedals in place. Ensure all screws are installed.
4. If required (pilots’ preference) the angle of the rudder pedals can be adjusted slightly forward to improve
the comfort level of the new pedals.
See section “5.2 Part B - Adjustment of the Rudder Pedal Angles”.

Type: JS Series
Technical Note
Rev: 1.0
Model/s: JS3
No: TN.03-057
Date of Issue: 22/07/2021
Title: Rudder Pedal Footplate Replacement
Page No: 4 of 5
Jonker Sailplanes Pty. Ltd. • Private Bag X1293 •Potchefstroom •South Africa, 2520
MO Number: M667 • DO Number: D667 • AMO Number: AMO1179
Reg No: 2013/134247/07 •VAT No: 494 023 1477
Web: jonkersailplanes.co.za • Technical Support Portal: portal.jonkersailplanes.co.za
5.2 Part B - Adjustment of the Rudder Pedal Angles
NOTE: Part B is affecting the control systems and must be signed off by an Approved Maintenance
Inspector and be certified in the sailplane inspection documents and/or sailplane logbook.
This part is only required if the angle of the rudder pedals needs to be adjusted to improve the
comfort to the pilot.
1. If installed, remove the Jet engine box and Jet ECU as described in the Jet Sustainer Maintenance Manual.
2. Locate the rudder bell crank BC1R behind the B9 bulkhead in the engine bay area.
3. The adjustment can be made by relocating the rudder cable adjustment plates connected to the rudder bell
crank.

Type: JS Series
Technical Note
Rev: 1.0
Model/s: JS3
No: TN.03-057
Date of Issue: 22/07/2021
Title: Rudder Pedal Footplate Replacement
Page No: 5 of 5
Jonker Sailplanes Pty. Ltd. • Private Bag X1293 •Potchefstroom •South Africa, 2520
MO Number: M667 • DO Number: D667 • AMO Number: AMO1179
Reg No: 2013/134247/07 •VAT No: 494 023 1477
Web: jonkersailplanes.co.za • Technical Support Portal: portal.jonkersailplanes.co.za
4. Loosen the M6 Nyloc nut and remove the bolt securing the adjustment plates in position.
5. Move the adjustment plates to the next forward position. It can be moved further forward in a next iteration
if the setup angles are still not satisfactory.
6. Insert the bolt and ensure the bolt goes through both the top and bottom adjustment plates. Secure in
place with a new M6 Nyloc nut.
NOTE: Do not over tighten the nut. The adjustment plates need to be able to swivel on the rudder bell
crank during operation.
7. Install the Jet engine box and Jet ECU as described in the Jet Sustainer Maintenance Manual.
6. ADDITIONAL INFORMATION
Parts can be obtained from:
Jonker Sailplanes Pty. Ltd.
1 Tigermoth Street
Potchefstroom
South Africa
Phone: [phone]
E-Mail: [e-mail]
Please indicate S/N and operating time of your aircraft in your inquiry.
7. APPROVAL
Compiled by:
Approved by:
Digitally signed by
Johann Mostert
Date: 2021.07.22
07:52:54 +02'00'
Uys
Jonker
Digitally signed by
Uys Jonker
Date: 2021.07.22
08:39:32 +02'00'