Jonker Sailplanes JS1-A Technical specifications

SUPPLEMENT

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
JS1 HAND RUDDER CONTROL SYSTEM
FLIGHT MANUAL SUPPLEMENT
Model: JS1-A, JS1-B, JS1-C18m, JS1-C21m
Serial Number:
Registration
Number:
Document
Number: 1A-5.04.10.3
Title: JS1 Hand Rudder Control System
Flight Manual Supplement
Date of Issue: 19 January 2015
Prepared by: Name: T.J. Mostert Signature:
Approved by: Name: J.S.U. Jonker Signature:

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 1
General
Record of Revision
Any revision of the present manual, except actual weighing data, must
be recorded in the following table and, in case of approved sections,
endorsed by the Civil Aviation Authority.
The new or amended text in the revised page will be indicated by a
black vertical line in the left hand margin, and the revision number and
the date will be shown on the bottom left hand of the page.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 2
Rev.
No Affected Section
Affected
Pages Date of Issue Description Approved by Date of Approval Date of Insertion Signature

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 3
List Of Effective Pages
Page Date of Page Date of Page Date of
No. Issue No. Issue No. Issue
0-1 19/01/2015
0-2 19/01/2015
0-3 19/01/2015
0-4 19/01/2015
0-5 19/01/2015
0-6 19/01/2015
1-1 19/01/2015
2-1 19/01/2015
3-1 19/01/2015
4-1 19/01/2015
4-2 19/01/2015
5-1 19/01/2015
5-2 19/01/2015
5-3 19/01/2015
5-4 19/01/2015
5-5 19/01/2015
5-6 19/01/2015
5-7 19/01/2015
6-1 19/01/2015
7-1 19/01/2015
7-2 19/01/2015

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 4
Table of Contents
General.............................................................................0-1
Record of Revision............................................................0-1
List Of Effective Pages ......................................................0-3
Table of Contents..............................................................0-4
List of Figures....................................................................0-6
List of Tables.....................................................................0-6
1. General......................................................................1-1
1.1 Introduction............................................................1-1
1.2 Warnings, Cautions and Notes...............................1-1
2. Control System for Physically Handicapped Pilot.......2-1
3. Rudder System..........................................................3-1
4. Airbrakes...................................................................4-1
5. Flaps.........................................................................5-1
5.1 Flap modes............................................................5-1
Manual Mode.....................................................5-2 5.1.1
Flaptronic Mode .................................................5-3 5.1.2
Full Auto Mode...................................................5-3 5.1.3
5.2 Flap Position Indication..........................................5-4
5.3 Failure Modes........................................................5-5
Low Battery Voltage...........................................5-5 5.3.1
Tripped Circuit Breaker.......................................5-5 5.3.2
Flap Position Sensor Failure...............................5-6 5.3.3
Flight Computer Failure......................................5-6 5.3.4
Flap Remote Switch Failure................................5-7 5.3.5
5.4 Emergency Procedure............................................5-7

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 5
6. Wheel Brake..............................................................6-1
7. Power Supply ............................................................7-1
7.1 Battery Charging....................................................7-2

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 0 - 6
List of Figures
Figure 1 - Rudder Control Lever.........................................3-1
Figure 2 - Rudder Control Lever Placard............................3-1
Figure 3 - Airbrake Control Lever Placard..........................4-1
Figure 4 - Airbrake Control Lever.......................................4-1
Figure 5 - Flap Mode Diagram...........................................5-1
Figure 6 - Flap Control Switch............................................5-2
Figure 7 - Current Flap Position Indicator...........................5-4
Figure 8 - Wheel Brake Lever............................................6-1
Figure 9 - Flap Power Supply Selector Switch....................7-1
Figure 10 - Flap Battery Charge Selector Switches............7-2
List of Tables
Table 1 - Airbrake Setting and Percentage Deflection........4-2

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 1 - 1
1. General
1.1 Introduction
This manual has been prepared by the manufacturer as an
appendix to the flight manual. This manual provides
information required for the safe operation of the non-
standard manual hand control system not listed in the Flight
Manual.
1.2 Warnings, Cautions and Notes
The following definitions apply to warnings, cautions and
notes used in this Flight Manual Supplement.
WARNING: Means that the non-observation of the
corresponding procedure leads to an
immediate or important degradation of the
flight safety.
CAUTION: Means that the non-observation of the
corresponding procedure leads to a minor or
to a longer term degradation of the flight
safety.
NOTE: Draws the attention on any special item not
directly related to safety but which is
important or unusual.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 2 - 1
2. Control System for Physically Handicapped
Pilot
An alternative means of controlling the rudder, airbrakes, flaps and
wheel brakes are installed for physically handicapped pilots who
has reduced function of their legs.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 3 - 1
3. Rudder System
The rudder may be controlled using either the conventional rudder
pedals or the hand rudder lever located on the left hand side in the
cockpit, as illustrated in Fig 1.
Figure 1 - Rudder Control Lever
Left rudder input is given by moving the hand rudder control lever
in the forward direction. Right rudder input is given by moving the
hand rudder control lever in the aft direction.
Figure 2 - Rudder Control Lever Placard
Hand Rudder
Control
Lever
Rudder Neutral
Position

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 4 - 1
4. Airbrakes
Airbrakes are actuated by the blue handle on the left-hand side of
the cockpit. The airbrakes are operated in the conventional
manner:
Moving the airbrake handle backwards opens the
airbrakes
Moving the airbrake handle forward closes the airbrakes
Figure 3 - Airbrake Control Lever Placard
The airbrake lever may be locked in one of the five possible
positions to allow simultaneous operation of the rudder hand
control. The positions are illustrated below in Fig. 4:
Figure 4 - Airbrake Control Lever
Air Brake
Control Lever
Open
Position
Closed
Position
Position 1
Position 2
Position 3
Position 4

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 4 - 2
WARNING: The airbrake lever does not control the wheel
brakes. Instructions concerning the wheel brakes
are given in section 6.
The following table gives the different airbrake settings of the glider
with the corresponding deflection of each setting:
Configuration
A
irbrake
Setting
Percentage
Deflection
Closed 0%
Position 1 26%
Position 2 45%
Position 3 63%
Position 4 82%
Full Open 100%
Table 1 - Airbrake Setting and Percentage Deflection

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 1
5. Flaps
The flaps are electrically controlled by a flap remote switch located
on the control stick or automatically (optional feature).
5.1 Flap Modes
Three modes of operation are available:
Manual mode
Flaptronic mode
Full Auto mode
Mode selection is done using a toggle switch located on the
instrument panel and a pushbutton on the control stick grip. The
mode change logic is illustrated in Fig. 5.
`
Figure 5 - Flap Mode Diagram
Select
Manual
Mode on
Instrument Panel
Manual
Mode
Flaptronic
Mode
Full Auto
Mode
Select
Manual
Mode on
Instrument Panel
Move
Remote
Switch on Control
Stick in any
direction
P
ush button
on
Control Stick
Select
Auto Mode
on Instrument
Panel

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 2
Manual Mode 5.1.1
In manual mode the flap can be adjusted to any position using the
flap remote switch on the stick. Push and hold the remote switch
in the desired direction and release it when the required flap
position is reached.
Figure 6 - Flap Control Switch
Pushing the flap remote switch upwards moves the flaps in the
negative (up) setting. Pushing the flap remote switch downwards
moves the flaps in the positive (down) setting.
Flap Remote
Switch

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 3
Flaptronic Mode 5.1.2
In Flaptronic mode, the flaps can be adjusted to pre-defined
settings using the flap remote switch on the control stick. Each
push on the flap remote switch advances the flap to the next
defined flap setting in the desired direction.
Pushing the remote switch upwards moves the flaps in the
negative (up) direction. Pushing the flap remote switch downwards
moves the flaps in the positive (down) direction.
Full Auto Mode 5.1.3
When the flap mode selection switch is selected to Auto mode and
the push button on the front of the control stick is pressed, the flap
system is fully automated. The flaps will be adjusted automatically
to the optimum setting for the given airspeed, weight and G-
loading. When the flap remote switch is pushed into any direction,
the flap system will enter Flaptronic mode.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 4
5.2 Flap Position Indication
The flap position is indicated on the LX flight computer, captioned
by the abbreviation “CurFlaps”. It is possible to reconfigure the
display layout. Refer to www.lxnav.si for details.
Figure 7 - Current Flap Position Indicator
Current Flap
Position Current Flap Position

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 5
5.3 Failure Modes
The electric flap system is designed with three modes of operation
to provide limited redundancy. Failure of one or more critical
systems will result in the loss of flap functionality. In this case, the
flaps will remain in the last selected position.
NOTE: Aileron control will not be affected with a failure of
the electrical flap system.
The following likely failures may occur:
Low Battery Voltage 5.3.1
Power can be lost due to loss of battery power. Battery voltage
can be observed on the flight computer display when selecting the
same battery for flaps and avionics.
The problem is solved by selecting a different power source for the
flap system.
Tripped Circuit Breaker 5.3.2
In case of a current overload, the flap circuit breaker on the
instrument panel may trip.
The problem can be solved by resetting the flap circuit breaker.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 6
Flap Position Sensor Failure 5.3.3
In the event that the current flap position is not indicated on flight
computer, the mechanical flap sensor has most likely failed.
In such an event, Manual mode must be selected for the flap
system.
Flap position can be determined by visual inspection of the
flaperon deflection near the winglet. Neutral flaperon (Flap 2)
position is defined as the position of the flaperon when aligned with
the adjacent wing trailing edge.
Flaps advance at a rate of 1.5 degrees per second.
Flight Computer Failure 5.3.4
In the event of a flight computer failure, the LX Flight Computer
instruction manual can be consulted to determine the cause of the
problem.
When this happens, Manual mode must be selected for the flap
system.

Jonker Sailplanes (Pty) Ltd.
Private Bag X1293
Potchefstroom 2520
South Africa
Approval number: D667/M667/AMO1179
Document Name:
JS1 Hand Rudder Control System
Flight Manual Supplement
Doc No:
1A-5.04.10.3 Revision No: 1.0 Date: 19/01/2015
Date of Issue: 19 January 2015 Page 5 - 7
Flap Remote Switch Failure 5.3.5
If the flaps are irresponsive in Manual or Flaptronic mode, the
remote switch on the control stick may be faulty.
In this case full auto mode can be selected. No manual flap
control is possible with this failure mode.
5.4 Emergency Procedure
In the event that a failed electrical flap system cannot be resolved,
the following procedure is recommended:
Observe the current flap position visually by looking at the
flap deflection at the wingtip.
Determine the speed limitation for the failed flap position.
Select a landing location best suited for the failed flap
position.